CYANOTECH CORP
S-3/A, 2000-08-10
MEDICINAL CHEMICALS & BOTANICAL PRODUCTS
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     As filed with the Securities and Exchange Commission on August 9, 2000.

                                                      Registration No. 333-42486
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                               ------------------
                               AMENDMENT NO. 1 to
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                               ------------------
                              CYANOTECH CORPORATION
             (Exact name of registrant as specified in its charter)
             Nevada                                             91-1206026
(State or other jurisdiction                                    (I.R.S. Employer
 of incorporation or organization)                           Identification No.)

     73-4460 Queen Kaahumanu Highway, Suite 102, Kailua-Kona, Hawaii 96740 (808)
  326-1353 (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices)
                               ------------------

                                 RONALD P. SCOTT
               Executive Vice President & Chief Financial Officer
                              Cyanotech Corporation
     73-4460 Queen Kaahumanu Highway, Suite 102, Kailua-Kona, Hawaii 96740 (808)
    326-1353 (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)
                               ------------------
                                   Copies to:
                              E. LAURENCE GAY, ESQ.
                        Goodsill Anderson Quinn & Stifel
                               1099 Alakea Street
                               Honolulu, HI 96813
                                 (808) 547-5600
                               ------------------

         Approximate date of commencement of proposed sale to public:  From time
to time after the effective date of this Registration  Statement,  as determined
by the selling stockholders.
         If the only securities  being registered on this Form are being offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. |_|
         If any of the  securities  being  registered  on  this  Form  are to be
offered  on a  delayed  or  continuous  basis  pursuant  to Rule 415  under  the
Securities Act of 1933,  other than  securities  offered only in connection with
dividend or interest reinvestment plans, check the following box. |X|
         If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the  Securities  Act  registration  statement  number  of the  earliest
effective registration statement for the same offering. |_| ____________
         If this  Form is a  post-effective  amendment  filed  pursuant  to Rule
462(b) under the Securities Act, check the following box and list the Securities
Act  registration   statement  number  of  the  earlier  effective  registration
statement for the same offering. |_| ____________
         If delivery of the  prospectus  is expected to be made pursuant to Rule
434, please check the following box. |_|
                             (Calculation of Registration Fee on following page)

<PAGE>
<TABLE>
<CAPTION>
                         CALCULATION OF REGISTRATION FEE

--------------------------------------------------------------------------------------------------------------------------
                                                               Proposed Maximum     Proposed Maximum
                                             Amount to be       Offering Price     Aggregate Offering       Amount of
         Title of each Class of             Registered(1)        Per Share(2)           Price(2)          Registration
      Securities to be Registered                                                                            Fee(2)
----------------------------------------- ------------------- ------------------- --------------------- ------------------
<S>                                          <C>                 <C>                  <C>                 <C>
Common Stock                                 $916,667 sh.        $1.77                $1,622,501          $429.00
========================================= =================== =================== ===================== ==================
</TABLE>

(1)  Shares of Common Stock which may be offered  pursuant to this  Registration
     Statement are issuable upon conversion of $1,250,000 principal amount of 6%
     Convertible   Subordinated   Debentures  due  April  30,  2002,   that  are
     convertible  into  833,333  Shares of Common  Stock,  and 83,334  Shares of
     Common Stock are issuable on exercise of Warrants  issued to the  Placement
     Agent for the Debentures. In addition to the shares set forth in the table,
     the  amount  to be  registered  includes  in  accordance  with  Rule 416 an
     indeterminate  number of shares  issuable upon conversion of the Debentures
     and upon the  exercise  of  Warrants,  as such  number may be adjusted as a
     result of stock splits, stock dividends and similar transactions.

(2)  Estimated  solely for the purpose of calculating  the  registration  fee in
     accordance with Rule 457(c) on the basis of the average of the high and low
     prices of the Common Stock as quoted on the NASDAQ  National Market on July
     24, 2000.


<PAGE>

PROSPECTUS

                              CYANOTECH CORPORATION
                         916,667 SHARES OF COMMON STOCK

                                   -----------


         This prospectus is being used in connection with offerings from time to
time by some of our  stockholders.  You  should  read  this  prospectus  and any
prospectus supplements carefully before you decide to invest.

         The selling  stockholders  collectively  own the following  stock being
registered here:

                833,333  shares of common  stock  issuable on  conversion  of 6%
                Convertible Subordinated Debentures due April 30, 2002 currently
                held by the selling stockholders.

                83,334   shares   of  common   stock  issuable  on  exercise  of
                outstanding warrants.

         All of the Common Stock sold under this prospectus will be sold for the
account of stockholders. We will receive no proceeds from the sale.

         Our common  stock is quoted on the  NASDAQ  National  Market  under the
symbol  "CYAN." The last  reported  sale price of the common stock on the NASDAQ
National Market on August 9, 2000 was $1.625 per share.


         INVESTING IN  THE  COMMON  STOCK  INVOLVES  RISK.  SEE  "RISK  FACTORS"
BEGINNING ON PAGE 3 BEFORE BUYING OUR COMMON STOCK.

         The  selling  stockholders  from  time to time may  offer  and sell the
shares  they hold on the  NASDAQ  National  Market  through  broker-dealers,  or
directly to one or more purchasers,  at market prices  prevailing at the time of
sale or at prices otherwise  negotiated.  The selling  stockholders  reserve the
sole right to accept or reject,  in whole or in part,  any proposed  purchase of
the shares made  directly or through  agents.  More  information  on the selling
stockholders  and how they will sell their  shares is  provided  in the  section
entitled "Plan of Distribution."

         Each selling  stockholder may be deemed to be an underwriter  under the
Securities Act of 1933, as amended.

         The mailing address of our principal  executive office is 73-4460 Queen
Kaahumanu  Highway,  Suite 102,  Kailua-Kona,  Hawaii  96740,  and the telephone
number is (808) 326-1353. We are a Nevada corporation.  We may be referred to in
this prospectus as Cyanotech, the Company, we, us or our.

         Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved  of these  securities or determined  that
this prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.

                 The date of this prospectus is August 9, 2000.

         WE HAVE  NOT  AUTHORIZED  ANYONE  TO GIVE ANY  INFORMATION  OR MAKE ANY
REPRESENTATION ABOUT THE COMPANY THAT IS DIFFERENT FROM, OR IN ADDITION TO, THAT
CONTAINED IN THIS PROSPECTUS.  THEREFORE, IF ANYONE DOES GIVE YOU INFORMATION OF
THIS SORT,  YOU  SHOULD NOT RELY ON IT. IF YOU ARE IN A STATE  WHERE AN OFFER TO
SELL, OR THE  SOLICITATION OF AN OFFER TO BUY, ANY OF THE SECURITIES  OFFERED BY
THIS  PROSPECTUS  IS UNLAWFUL,  OR IF YOU ARE A PERSON TO WHOM IT IS UNLAWFUL TO
DIRECT THESE KINDS OF OFFERS,  THE OFFER  PRESENTED IN THIS  PROSPECTUS DOES NOT
EXTEND TO YOU.  THIS  PROSPECTUS  SPEAKS ONLY AS OF THE DATE OF THIS  PROSPECTUS
UNLESS THE INFORMATION SPECIFICALLY INDICATES THAT ANOTHER DATE APPLIES.

                                        2
<PAGE>
                                TABLE OF CONTENTS


FORWARD-LOOKING STATEMENTS.............................................        3

THE COMPANY............................................................        3

RISK FACTORS...........................................................        3

USE OF PROCEEDS........................................................        8

SELLING STOCKHOLDERS...................................................        8

PLAN OF DISTRIBUTION...................................................       10

LEGAL MATTERS..........................................................       11

EXPERTS  ..............................................................       11

WHERE YOU CAN FIND MORE INFORMATION....................................       12

INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE........................       12

                                        2
<PAGE>
                           FORWARD-LOOKING STATEMENTS

         Some statements  under "Summary," "Risk Factors," and elsewhere in this
prospectus and in documents  referred to are  forward-looking  statements within
the  meaning of  Section  27A of the  Securities  Act of 1933,  as amended  (the
"Securities  Act"),  and Section 21E of the Securities  Exchange Act of 1934, as
amended (the "Exchange Act").  These statements involve known and unknown risks,
uncertainties  and  other  factors  that may  cause  our  actual  results  to be
materially  different  from any  future  results,  expressed  or implied by such
forward-looking  statements. We caution you that such forward-looking statements
are not  guarantees  of future  performance.  Our actual  results  could  differ
materially from those  anticipated by such  forward-looking  statements due to a
number  of   factors,   some  of  which  are  beyond  our   control.   All  such
forward-looking  statements  are  current  only  as of the  date on  which  such
statements   were  made.  We  do  not  assume  any   obligation  to  update  any
forward-looking  statement to reflect events or circumstances  after the date on
which any such statement is made or to reflect the  occurrence of  unanticipated
events. We particularly urge readers to consider the factors described under the
heading Risk Factors. Those risks and the other economic,  competitive and other
factors noted  elsewhere in this  prospectus  and in our recent filings with the
Securities  and  Exchange  Commission,   including  our  Form  10-K,  constitute
cautionary  statements  that identify risks and  uncertainties  that could cause
actual results to differ materially from those contained in the  forward-looking
statements.

                                   THE COMPANY

         We develop and  commercialize  natural products from microalgae for the
nutritional  supplement,  animal  pigmentation,  and  immunological  diagnostics
markets.   Microalgae  are  microscopic  plants  which  have  a  wide  range  of
physiological and biochemical characteristics and contain high levels of natural
nutrients.  Microalgae grow much faster than land-based  plants.  Cyanotech uses
proprietary  production  and  harvesting  systems  which  eliminate  many of the
stability and contamination problems frequently encountered in the production of
microalgae.

         Our  principal  revenues  are  sales  of  microalgae-based  "Spirulina"
products  for the vitamin and  supplement  market,  which for the United  States
alone is estimated at $14.9 billion.  Spirulina Pacifica(R) is our unique strain
of Spirulina. It is a vegetable-based,  highly absorbable source of natural beta
carotene,  mixed  carotenoids  and  other  phytonutrients,   B  vitamins,  gamma
linolenic acid, protein and essential amino acids. We market our products in the
United States and 37 other  countries  through  retail,  wholesale,  and private
label channels.

         We  also  produce   astaxanthin  from  microalgae  for  use  as  animal
pigmentation. Astaxanthin is a red pigment used primarily to impart a pink color
to  the  flesh  of  pen-raised  fish  and  shrimp.   Our  astaxanthin   product,
NatuRose(R), competes against synthetic astaxanthin. Sales of NatuRose have been
limited,  we believe,  by the reluctance of the  aquaculture  industry to switch
from Hoffmann-LaRoche, the major supplier of this key ingredient.

         The Company believes that natural  astaxanthin may offer certain health
benefits for humans.  We obtained  market  clearance from the U.S. Food and Drug
Administration  ("FDA")  in  August  1999  to  sell  the  product  as a  dietary
supplement. The Company has developed and launched a natural astaxanthin dietary
supplement,  called  BioAstin(TM),  which we believe  can retard and  ameliorate
fever  blisters and canker  sores,  as well as carpal tunnel  syndrome;  provide
protection from sunburn by ultraviolet  light; and relieve muscle soreness after
strenuous exercise.

         Cyanotech  also  produces  phycobiliproteins  from  microalgae  for the
medical  and  biotechnology  research  industry.  Phycobiliproteins  are  highly
fluorescent pigments used as tags or markers in many kinds of biological assays.
Sales of  phycobiliproteins  accounted  for  about 3% of our  sales for the year
ended March 31, 2000.

                                  RISK FACTORS

         In addition to the other information we provide in this prospectus, you
should  carefully  consider  before  deciding to invest in our common  stock the
following  risks  and  the  risks  outlined  in the  documents  incorporated  by
reference.  These are,  however,  not the only risks we face. Some risks are not
yet known to us and there are others we do not  currently  believe are  material
but could  later turn out to be so. All of these  could hurt our  business.  The
trading  price of our common  stock  could  decline  because  of general  market
conditions or because any or all of these risks come to pass.

WE HAVE A HISTORY OF LOSSES FROM OPERATIONS AND FLUCTUATIONS IN OPERATING
RESULTS.

         We have  reported  losses  from  operations  in each of the past  three
fiscal years and had an accumulated  deficit of $7,803,000 at March 31, 2000. If
losses from operations  continue,  the market price for the common stock and our
ability  to  maintain  existing  financing  and obtain  new  financing  could be
adversely  affected.  We may not be able to achieve consistent  profitability in
the future. We have experienced quarterly fluctuations in operating results and

                                        3
<PAGE>
anticipate that these fluctuations may continue in future periods. A significant
portion of our expense  levels are fixed and,  if sales are below  expectations,
the adverse impact may be magnified by the inability to adjust spending  quickly
enough.


WE MAY NEED ADDITIONAL  CAPITAL AND OUR ABILITY TO OBTAIN ADDITIONAL  CAPITAL IS
CURRENTLY RESTRICTED.

         We  believe  that  borrowings  available  under our  secured  term loan
facility,  together  with the  proceeds  from  our  recently  issued  $1,250,000
principal  amount  of  6%  Convertible  Subordinated  Debentures  together  with
internally  generated  funds will be  sufficient  to fund our  requirements  for
working  capital  and  capital  expenditures  through  the end of  fiscal  2001.
However,  we may need to raise additional funds to finance  expansion  programs,
and we cannot ensure that our  financial  performance  will generate  sufficient
funds. Also, on April 30, 2002, we will require funds to repay the debentures if
they have not been converted prior to that date by the holders.

         Our existing  secured term loan facility has a limit of $3,500,000,  of
which  $1,857,000  was applied on April 21, 2000 to repay prior debt and closing
costs,  and of which  $500,000  is being  held by the  lender  in a  maintenance
reserve  account.  Capital  expenditures  are  limited  each  year to  $500,000.
Covenants  in this term loan require us to maintain  certain  levels of eligible
receivables  and inventory and also require us to maintain  financial  covenants
for tangible  balance sheet equity,  debt to net worth ratio,  current ratio and
debt  service  coverage,  and  restrict  us from  incurring  additional  secured
indebtedness from third parties.  Substantially all of our assets are pledged as
collateral  for repayment of the term loan.  Our  collateral  pledge may make it
more difficult for us to obtain additional  financing on advantageous  terms, if
at all.

WE ARE IN PATENT LITIGATION WITH A COMPETITOR.

         The  Company  is a party to a suit  involving  patent  rights and trade
secrets   with  an   astaxanthin   competitor,   Aquasearch,   Inc.  We  alleged
misappropriation  of trade secrets and other claims.  Aquasearch  alleged patent
infringement, misappropriation of trade secrets, and other claims against us. In
December  1999,  the U.S.  District  Court for the District of Hawaii denied our
motion for partial summary  judgment on  non-infringement  and invalidity of the
Aquasearch patent, and granted  Aquasearch's motion for partial summary judgment
that we infringe such patent. The Court also granted Aquasearch's motion that we
misappropriated  their trade  secrets and  committed a breach of  contract.  The
Company  continues to press its claims against  Aquasearch and believes that the
outcome will not have a material  adverse effect on it. However,  the outcome of
this suit is  difficult  to  predict,  and if  Aquasearch  should  predominantly
prevail,  there could be a material  adverse  effect on the Company's  financial
condition and operations.

WE RELY PRINCIPALLY ON A SINGLE PRODUCT.

         Spirulina Pacifica, our principal product, accounted for 87% and 91% of
net sales for the years ended March 31, 2000 and 1999. We anticipate  that sales
of our Spirulina  products will continue to constitute a substantial  portion of
net sales during  fiscal 2001.  Any  material  decrease in the overall  level of
sales of, or the prices  for,  our  Spirulina  products,  whether as a result of
competition,  change in consumer demand, increased worldwide supply of Spirulina
or any other  factors,  would have a material  adverse  effect on our  business,
financial condition and results of operations.  Moreover,  we have suspended new
product  development,  such as a  bio-engineered  mosquitocide  and our aldolase
catalytic  antibody,  in line with our goal of  returning  to  profitability  as
quickly as possible. There can be no assurance that new commercial products will
be  developed  even if  development  resumes in the  future.  Our  inability  to
successfully develop or commercialize  additional products could have a material
adverse effect on our business, financial condition and results of operations.

WE DEPEND ON A SINGLE CUSTOMER FOR OVER 10% OF OUR SALES.

         Approximately  23% of our net  sales for  fiscal  2000 were to a single
customer,  Spirulina  International B.V., a Spirulina marketing and distribution
company  based in Europe.  Sales to this  customer were 11% of net sales for the
prior fiscal year. Loss of this business could have a material adverse effect on
the Company.

WE FACE STRONG COMPETITION IN OUR MARKETS.

         Our  Spirulina  products  compete with a variety of  vitamins,  dietary
supplements,  other algal products and similar nutritional products available to
consumers.  The nutritional  products market is highly competitive.  It includes
international,  national, regional and local producers and distributors, many of
whom have greater  resources  than  Cyanotech,  and many of whom offer a greater
variety of products. Our direct competition in the Spirulina market currently is
from Dainippon Ink and Chemical  Company's  Earthrise facility in California and
several  large farms in China.  To a lesser  extent,  we compete  with  numerous
smaller farms.  Packaged  consumer products marketed under our Nutrex brand also
compete  with  products  marketed  by health  food  manufacturing  customers  of
Cyanotech who purchase bulk Spirulina from us and package it for retail sales. A
decision by another  company to focus on Cyanotech's  existing or target markets
or a substantial increase in the overall supply of Spirulina could have a

                                        4
<PAGE>
material  adverse  effect on our  business,  financial  condition and results of
operations.  There can be no assurance that we will not  experience  competitive
pressure,  particularly  with  respect to  pricing,  that could  materially  and
adversely affect us.

         Our natural astaxanthin product,  NatuRose,  competes directly with the
synthetic  astaxanthin product produced and marketed for the commercial feed and
aquaculture industry worldwide by Hoffmann-LaRoche.  In addition,  several other
companies  have  announced  plans to produce  commercial  quantities  of natural
astaxanthin  from  microalgae and Phaffia  yeast.  We are unaware of any studies
indicating  that natural  astaxanthin for such use has any benefits not provided
by synthetic  astaxanthin.  There can be no assurance that our NatuRose  product
can compete with  synthetic  astaxanthin,  which could  materially and adversely
affect our business.

         Our human use astaxanthin product, BioAstin, was the first commercially
available   microalgae-based   astaxanthin   product  in  the   United   States.
AstaCarotene AB ("AstaCarotene") of Sweden produces and sells a microalgae-based
human use  astaxanthin  product in Europe.  Aquasearch  Inc.  ("Aquasearch"),  a
development-stage  company  based in  Hawaii,  claims  to be  producing  natural
astaxanthin from microalgae for such use, but has not yet generated  significant
sales revenue.

WE ARE SUBJECT TO THE UNCERTAINTIES OF GOVERNMENT REGULATION.

         Our products, potential products, manufacturing and research activities
are subject to regulation by a number of  government  authorities  in the United
States  and in other  countries,  including  the  Food  and Drug  Administration
("FDA"), pursuant to the Federal Food, Drug and Cosmetic Act. The FDA regulates,
to varying  degrees  and in  different  ways,  dietary  supplements,  other food
products,  diagnostic  medical devices and  pharmaceutical  products,  including
their  manufacture,   testing,  exportation,   labeling,  and,  in  some  cases,
advertising.

         We are also subject to regulation with respect to labeling of products,
importation  of  organisms,   and  occupational   safety,   among  others.  Such
regulations   and  policies  are  subject  to  change  and  depend   heavily  on
administrative  policies and interpretations.  We work with foreign distributors
to ensure our compliance with foreign laws, regulations and policies.  There can
be no  assurance,  however,  that  changes  with  respect to federal,  state and
foreign laws,  regulations and policies,  and,  particularly with respect to the
FDA or other such regulatory bodies, with possible  retroactive effect, will not
have a material adverse effect on our business,  financial condition and results
of operations.

         The Federal  Dietary  Supplement  Health and  Education  Act  ("DSHEA")
regulates  the use and  marketing  of  dietary  supplements,  including  vitamin
products.   DSHEA  also  establishes  Good   Manufacturing   Practices  ("cGMP")
requirements for dietary supplements.  It also regulates the labeling of dietary
supplements.  We believe,  though  there can be no  assurance,  that  Spirulina,
marketed  as a dietary  supplement,  is  exempt  from FDA  regulation  as a food
additive.

         Our Spirulina  manufacturing  processes  and our contract  bottlers are
required  to adhere to cGMP as  prescribed  by the FDA.  We believe  that we are
currently in compliance with all applicable cGMP and other food  regulations but
there can be no assurance  that  Cyanotech can continue to meet  applicable  FDA
manufacturing  requirements.  The  use  of  Spirulina  as a  food  additive  for
seasoning  on salads or pasta or for other food uses has not been cleared by the
FDA.  We  currently  market our  product for these food uses on the basis of our
belief that its use in these food  applications is generally  recognized as safe
and therefore is not subject to FDA pre-market clearances as a food additive.

         Our natural astaxanthin product,  NatuRose,  has received clearance for
use as a feed and food  color  additive  in Japan and  Canada  and has  received
organic  registration for use in feed in New Zealand but will need clearance for
use as a feed color  additive in the United  States.  We are  actively  pursuing
clearance for such use with the FDA and anticipate  final approval by the summer
of 2000.  The  process  of  obtaining  clearances  for a new color  additive  is
expensive  and  time  consuming.  No  assurances  can be  given  that any of our
proposed  products  intended for use as a feed additive will be approved for use
in the United States on a timely basis, if at all.

         Sales of our astaxanthin product, BioAstin, are regulated in the United
States by the FDA and the DSHEA rules. Our BioAstin products received FDA market
clearance in August 1999.

WE ARE IN A BUSINESS WITH UNIQUE RISKS.

         Many unique compounds have been identified in microalgae.  However, the
efficient  and cost  effective  commercial  production of microalgae is elusive.
Many microalgae  culture systems over the last 20 years have failed.  Microalgae
produced for food supplements are typically  cultivated and harvested  outdoors.
Production is  significantly  affected by climate,  weather  conditions  and the
chemical  composition of the culture media.  Without consistent  sunlight,  warm
temperature,  low rainfall and proper chemical balance, microalgae will not grow
quickly.  Longer harvesting cycles mean decreased pond utilization and increased
cost. Furthermore, microalgal growth requires a nutrient rich environment. High

                                        5
<PAGE>
nutrient  levels in the ponds  promote  the  growth of  unwanted  organisms,  or
"weeds," if the  chemical  composition  of the ponds  changes  from its required
balance. If contamination occurs, a pond must be emptied,  cleaned and refilled,
a process that decreases pond utilization and increases production costs.

OUR INTELLECTUAL PROPERTY IS DIFFICULT TO PROTECT.

         We rely on a  combination  of trade  secrets,  contracts,  and  patent,
copyright and trademark law protection to establish and protect the intellectual
property  rights that are so critical to our success.  There can be no assurance
that we will be able to protect our  technology  adequately or that  competitors
will not be able to develop similar technology  independently.  In addition, the
laws of certain  foreign  countries may not protect the  Company's  intellectual
property rights to the same extent as the laws of the United States.  Litigation
in the United  States or abroad may be  necessary to enforce our patent or other
intellectual  property  rights,  to protect our trade secrets,  to determine the
validity  and scope of the  proprietary  rights  of others or to defend  against
claims of  infringement.  Such litigation,  even if successful,  could result in
substantial  costs and diversion of resources and could have a material  adverse
effect  on  our  business,   results  of  operations  and  financial  condition.
Additionally,  if any such claims are asserted against us, we may seek to obtain
a license under the third party's intellectual  property rights. There can be no
assurance,  however,  that a license  would be available on terms  acceptable or
favorable to us, if at all.

OFFICERS AND DIRECTORS HOLD A SUBSTANTIAL STOCK INTEREST.

         As of June 30, 2000,  executive  officers and  directors of the Company
(seven persons)  beneficially  owned  approximately  15% of the Company's Common
Stock,  assuming conversion of all outstanding shares of the Company's Preferred
Stock.  Thus,  our  management  is in a position to influence  to a  significant
degree the direction  and policies of the Company,  the election of our Board of
Directors and the outcome of other matters requiring stockholder approval.

OUR SUCCESS IS DEPENDENT ON THE CONTINUED SERVICE OF OUR KEY PERSONNEL.

         The Company is and will  continue to be dependent  upon the efforts and
abilities of a number of current key personnel. None of the current officers has
an employment  agreement  with the Company.  Inability to attract and retain our
management and associates  could have a material adverse effect on the business,
financial condition and results of operations of the Company.


SALES TO DISTRIBUTORS AND MANUFACTURERS  AND  INTERNATIONAL  SALES ACCOUNT FOR A
SUBSTANTIAL PORTION OF OUR REVENUES.

         The majority of our bulk  Spirulina  sales are to companies  with their
own  Spirulina  product  lines.  Some of these  companies  identify  and promote
Cyanotech's  Hawaiian  Spirulina in their products,  others do not. We also sell
directly  to health  food  manufacturers.  Consumer  products  are sold  through
distributors and brokers.  Thus we are largely dependent on the efforts of third
parties to reach the ultimate consumers of our products.

         In the  years  ended  March  31,  2000 and  1999,  international  sales
accounted for  approximately  46% and 40%,  respectively,  of our net sales. Our
business,  financial  condition and results of operations  may be materially and
adversely  affected  by  any  difficulties  associated  with  managing  accounts
receivable  from  international  customers,  tariff  regulations,  imposition of
governmental  controls,  political  and  economic  instability  or  other  trade
restrictions.  Although our  international  sales are currently  denominated  in
United States dollars,  fluctuations in currency  exchange rates could cause our
products to become  relatively  more  expensive  to  customers  in the  affected
country, leading to a reduction in sales in that country.

THE DIVIDEND ARREARAGE ON OUR PREFERRED STOCK IS SUBSTANTIAL.

         The  Company  had   outstanding  on  June  30,  2000,   371,031  shares
($1,855,155 - liquidation preference plus unpaid cumulative dividends) of Series
C Preferred  Stock,  convertible  into  1,855,155  shares of Common  Stock on or
before  February  23, 2002.  These shares are entitled to an 8% annual  dividend
that has not been paid and until it is paid no dividends may be declared or paid
on the Common Stock. There was on June 30, 2000 a $1,635,000 dividend arrearage.
The cumulative but unpaid  dividends are foregone upon  conversion,  but must be
paid on liquidation of the Company.  The consent of the holders of the Preferred
Stock is required to modify their present rights or to sell all or substantially
all of the Company's assets.

WE PAY NO DIVIDENDS ON OUR COMMON STOCK.

         The Company has never paid any cash  dividends  on its Common Stock and
does not anticipate paying cash dividends on the Common Stock in the foreseeable
future. The payment of dividends on the Common Stock by the Company

                                        6
<PAGE>
will depend on its earnings, its financial condition,  the payment of the Series
C Preferred Stock dividend  arrearages,  and other business and economic factors
affecting the Company as the Board of Directors considers relevant.

"PENNY STOCK" RULES.

         The  Company's  Common  Stock  is  presently  traded  on  the  National
Association of Securities Dealers Automated Quotation ("NASDAQ") National Market
System,  which requires that we have a minimum bid price of $1.00 for our common
stock to qualify for  continued  listing.  The low bid price for common stock in
fiscal 2000 for each of the quarters  ended June 30,  September 30,  December 31
and March 31 was $.59, $.72, $.50 and $1.00,  respectively,  and the last traded
price on  August 9, 2000 was  $1.625.  If the  common  stock is  delisted,  then
brokers  engaged  in  transactions  in the stock  would be  required  to provide
customers with a risk disclosure  document and the amount of the compensation of
the broker/dealer in the transaction and monthly account  statements showing the
market  values of the amount of the stock held in the  customer's  accounts.  If
brokers become subject to these "penny stock" rules,  they would be less willing
to engage in transaction  involving our stock,  thereby making it more difficult
for investors to dispose of their shares.

WE ARE SUBJECT TO PRODUCT LIABILITY RISKS.

         Use of our  products  in human  consumption  may expose the  Company to
liability  claims,  although the Company has not been subject to any such claims
to date. The Company conducts regular quality  assurance tests, but there can be
no assurance that the Company's  products will not suffer  contamination  at the
Company's facilities or in the distribution  channel,  which could in turn cause
injury to  consumers.  The Company does not believe  that natural beta  carotene
increases  health  risks.  There has been one study  released  in January  1996,
however, that indicated that among smokers and persons who worked with asbestos,
users of  synthetic  beta  carotene  had a higher  incidence  of death from lung
cancer and heart disease.  The Company maintains product liability  insurance in
limited  amounts  for  products  involving  human  consumption.  There can be no
assurance that the Company's insurance will be adequate or will remain available
to cover any  liabilities  arising  from use of its  products.  A  contamination
problem,  product  liability  claim or recall of products  could have a material
adverse  effect on the Company's  business,  financial  condition and results of
operations.

                                        7
<PAGE>
                                 USE OF PROCEEDS

         We will not receive any proceeds  from the sale of shares of our common
stock by the  selling  stockholders  but have  agreed  to bear all  expenses  of
registration  of the  selling  stockholders'  shares  under  federal  and  state
securities laws. See "Plan of Distribution."

                              SELLING STOCKHOLDERS

         The following table sets forth  information,  received through July 25,
2000,  with respect to the number of shares of common stock that would have been
owned  beneficially  by the selling  stockholders  prior to this offering if all
their  Debentures  had  been  converted  and  they  had  exercised  all of their
Warrants.  These are the shares to be registered and sold under this prospectus.
The information is based on information  provided by or on behalf of the selling
stockholders.  The selling  stockholders and holders listed in any supplement to
this prospectus,  and any transferors,  pledgees,  donees or successors to these
persons,  may from time to time offer and sell,  pursuant to this prospectus and
any  subsequent  prospectus  supplement,  any  and  all  of  these  shares.  Any
supplement to this prospectus may contain additional or varied information about
the selling  stockholders  or such other  holders,  and the shares  beneficially
owned by each such person.

         The  selling  stockholders  may offer  all,  some or none of the common
stock  listed  below.  Therefore,  no estimate  can be given as to the amount or
percentage  of the common  stock that will be held by the  selling  stockholders
upon termination of any of the sales. Also, the selling stockholders  identified
below may have sold,  transferred  or otherwise  disposed of all or a portion of
their  Debentures,  Warrants or underlying  common stock since the date on which
they provided the information to us.

         The shares offered by this  prospectus may be offered from time to time
by the selling stockholders named below:
                                                            NUMBER OF SHARES OF
                                                                COMMON STOCK
                SELLING  STOCKHOLDER (1)                    INCLUDED IN OFFERING
                --------------------                        --------------------

        Beneficial Owners of Debentures:
        -------------------------------
        A. Raymond ABT Grantor Trust                                 13,333
        Robert W. Allen                                              33,333
        Alvin R. Bonnette Rev Trust                                  16,667
        E.H. Arnold                                                  50,000
        Gary P. Arnold                                               66,667
        Keith Becker                                                 33,333
        John Bertsch                                                 20,000
        Leonard C. Blade                                              6,667
        Charles Brand                                                16,667
        John C. Clifford                                             20,000
        Delaware Charter Guarantee &
                Trust Trustee FBO:  Edward Brody                      6,667
        Francis and Guerino Deluca                                   26,667
        Steven J. Dennis                                              6,667
        Lloyd B. Embry                                               10,000

                                        8
<PAGE>
        Harry M. Farnham III and Cynthia G. Farnham                  16,667
        Dennis Fortin                                                33,333
        Anthony J. Hegler                                             6,667
        Jeffrey G. and Mary A. Hipp                                  10,000
        Ronald Johnson                                               10,000
        Howard Kalka                                                 20,000
        Marla and Larry Kaplan                                        6,667
        Randall S. Knox                                               6,667
        Gustave and Lydia Levonson                                   33,333
        Donald B. and Jacqueline M. McCulloch                         6,667
        Louis G. Miller                                              20,000
        Fred Ostad                                                    6,667
        Robert G. Paul                                               20,000
        Sanford R. Penn                                              13,333
        Louis Porga                                                   6,667
        Le Randle, Jr.                                                6,667
        David Random                                                  6,667
        Shadow Capital LLC                                           33,333
        Howard Smith                                                  6,667
        William C. Smith, Jr.                                         6,667
        William C. Steele                                             6,667
        Arthur D. and Marie E. Sterling                              33,333
        Taglich Brothers, Inc. FBO: Michael N. Taglich
                401(k) Plan (2)                                      26,666
        Taglich Brothers, Inc. FBO: Robert F. Taglich
                401(k) Plan (2)                                      26,666
        Susan E. Thorstenn                                            6,667
        Richard A. Unverferth                                        13,333
        U. S. Bank N. A., Trustee, Dorsey and Whitney
                Master Trust                                          6,667
        Wafgal Limited                                                6,667

                                        9
<PAGE>
        Thomas J. Waggoner                                           20,000
        Richard C. Oh (2)                                               667
        Vincent Palmieri (2)                                            667
        Robert C. Schroeder (2)                                       4,000
        Douglas E. Hailey (2)                                         8,000
        Michael N. Taglich (2)                                       23,333
        Taglich Brothers, Inc. (2)                                   46,663
                                                                   --------
             Total ..............................................   833,333

        Beneficial Owners of Warrants: (1)(2)
        -----------------------------
        Richard C. Oh                                                 3,000
        Vincent Palmieri                                              3,000
        Gina Sciannameo                                                 500
        Tere D'Silva                                                    500
        Laura A. Conroy                                               2,000
        Luis Martins                                                  1,000
        Michael C. Roesler                                            1,000
        William G. Ryon                                               1,500
        Francisco J. Clough                                           1,000
        Douglas E. Hailey                                            20,800
        Robert C. Schroeder                                           7,000
        Michael N. Taglich                                           21,017
        Robert F. Taglich                                            21,017
                                                                    -------
             Total ...............................................   83,334

(1)  None of the selling stockholders beneficially owned any other shares of our
     Common Stock prior to this offering.

(2)  None of the selling  stockholders has had a material  relationship with the
     Company  within the past three years,  except for these holders who are all
     affiliates of Taglich  Brothers,  Inc.,  the  broker-dealer  which acted as
     Placement  Agent for the Debentures and which received the Warrants as part
     of its compensation for such services.

                              PLAN OF DISTRIBUTION

         This prospectus  relates to the offer and sale from time to time by the
selling  stockholders  of up to 916,667 shares of our common stock.  The selling
stockholders will act independently of Cyanotech Corporation in deciding to sell
their  shares.  We will not receive any proceeds  when the selling  stockholders
sell their shares.

                                       10
<PAGE>
         Shares  of  our  common  stock  covered  by  this  prospectus  and  any
prospectus  supplement  may be offered and sold from time to time by the selling
stockholders in one or more transactions.  The selling  stockholders,  including
their transferees,  pledgees or donees or their successors,  may sell or dispose
of the shares being offered here in various ways:

         -      on the NASDAQ National Market through broker-dealers;
         -      in  negotiated  private  transactions  or  otherwise,  including
                an underwritten  offering;
         -      by  pledge  or by grant of a security interest in the  shares to
                secure  debts and other  obligations;
         -      through the distribution of the shares by a selling  stockholder
                to its partners, members  or  stockholders;  or
         -      in a combination of any of the above transactions.

         In  connection  with the sale of the  common  stock or  otherwise,  the
selling  stockholders may enter into hedging transactions with broker-dealers or
other  financial   institutions.   These   broker-dealers   or  other  financial
institutions  may in turn engage in short sales of the common  stock and deliver
these  securities  to close out  these  short  positions.  They also may lend or
pledge  the  common  stock  to  broker-dealers  that  in  turn  may  sell  these
securities.

         The  selling  stockholders  may sell  their  shares  by block  trade or
otherwise, at market prices prevailing at the time of sale, at prices related to
the prevailing market prices,  at negotiated prices or at fixed prices.  Each of
the selling  stockholders  reserves the right to accept and, together with their
agents from time to time, to reject,  in whole or in part, any proposed purchase
of the common stock to be made directly or through agents.

         The selling  stockholders  may sell their shares directly to purchasers
or may  use  underwriters,  broker-dealers  or  agents  to  sell  their  shares.
Underwriters,   broker-dealers  or  agents  who  sell  the  shares  may  receive
compensation  in the form of discounts,  concessions,  or  commissions  from the
selling  stockholders  or they may receive  compensation  from purchasers of the
shares  for whom  they  acted as  agents  or to whom  they  sold the  shares  as
principal,   or  both.   The   selling   stockholders   and  any   underwriters,
broker-dealers  or agents that participate in the sale of their common stock may
be deemed to be  "underwriters"  within the meaning of the  Securities  Act. Any
discounts,  commissions,  concessions or profits received by these underwriters,
broker-dealers  or  agents  or  agents  on  any  resale  of  the  shares  may be
underwriting  discounts  and  commissions  under  the  Securities  Act.  Selling
stockholders  who are  "underwriters"  within the meaning of the Securities Act,
will be subject to the prospectus delivery requirements of the Securities Act.

         We will pay all fees and expenses incurred in connection with preparing
and filing this  prospectus and any prospectus  supplement and the  registration
statement and any amendments to those documents.  The selling  stockholders will
pay any brokerage commissions and similar selling expenses.

         We have  agreed  to keep the  registration  statement,  of  which  this
prospectus  and  any  subsequent  prospectus   supplements  constitute  a  part,
effective  for three  years from its  effective  date or until all of the common
stock covered by this  registration  statement has been sold,  whichever  occurs
first.  We cannot assure that the selling  stockholders  will sell all or any of
the shares of common stock offered here.

         Under the registration rights agreement with the selling  stockholders,
we  have  agreed  to  indemnify  the  selling  stockholders,   and  the  selling
stockholders have agreed to indemnify us, and each of us has agreed to indemnify
other persons named or described in the registration  rights agreement,  in each
case against various  liabilities,  including some liabilities arising under the
Securities Act of 1933, as amended, in connection with the offer and sale of the
common stock sold hereunder by the selling  stockholders.  These indemnification
obligations of ours and the selling  stockholders  generally include obligations
to indemnify any  underwriter  that  participates in the offering or sale of the
common  stock by the  selling  stockholders  and any  person who  controls  each
underwriter.

         Under the securities laws of certain states, the securities may be sold
in such states only through registered or licensed brokers or dealers.

                                  LEGAL MATTERS

         The validity of the common stock offered under this  prospectus will be
passed upon by Woodburn and Wedge, Reno, Nevada.

                                     EXPERTS

         The  consolidated   financial  statements  and  schedule  of  Cyanotech
Corporation and  subsidiaries as of March 31, 2000 and 1999, and for each of the
years in the three  years  ended  March 31,  2000,  have  been  incorporated  by
reference in this  registration  statement  in reliance  upon the report of KPMG
LLP, independent certified public accountants, incorporated by reference herein,
and upon the authority of said firm as experts in accounting and auditing.

                                       11
<PAGE>

                       WHERE YOU CAN FIND MORE INFORMATION

         This prospectus is part of a registration statement on Form S-3 that we
filed with the Commission.  Some information in the  registration  statement has
been  omitted  from  this  prospectus  in  accordance  with  the  rules  of  the
Commission.  We are subject to the informational  requirements of the Securities
Exchange  Act of 1934,  as  amended  ("Exchange  Act"),  and  accordingly,  file
reports,  proxy  and  information  statements  and  other  information  with the
Securities and Exchange Commission.  You may read and copy all or any portion of
the  registration  statement  as  well as the  reports,  proxy  and  information
statements and other  information  that we have filed with the Commission at the
Commission's  public reference rooms  maintained at Room 1024,  Judiciary Plaza,
450 Fifth Street, N.W.,  Washington,  D.C. 20549, and at the regional offices of
the Commission:  Seven World Trade Center, 13th Floor, New York, New York 10048,
and Northwest  Atrium  Center,  500 West Madison  Street,  Suite 1400,  Chicago,
Illinois  60661.  You can request  copies of these  documents  upon payment of a
duplicating  fee, by writing to the  Commission.  Please call the  Commission at
1-800-SEC-0330 for further  information on the operation of the public reference
rooms.  Our  filings  with  the  Commission  are  also  available  to you on the
Commission's Internet side  (http://www.sec.gov).  Our common stock is quoted on
The  Nasdaq  National  Market  under  the  symbol  "CYAN".  Reports,  proxy  and
information  statements and other information concerning the Company may also be
inspected  at The Nasdaq  Stock Market at 1735 K Street,  NW,  Washington,  D.C.
20006.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         The Commission  allows us to  incorporate  by reference  certain of our
publicly-filed   documents  into  this  prospectus,   and  such  information  is
considered part of this prospectus. Information that we file with the Commission
after the date of this prospectus will  automatically  update and supersede this
information.  We  incorporate  by reference the  documents  listed below and any
future filings made with the Commission under Sections 13(a),  13(c), 14 (except
for any reports of our Compensation and Stock Option Committee included therein)
or 15(d) of the  Exchange Act until the selling  stockholders  have sold all the
shares  of  common  stock   described  in  this  prospectus  or  until  we  have
de-registered any remaining unsold shares.

         The following documents filed with the Commission  (File No.  0-146-02)
are  incorporated  by reference in this prospectus:

         (1)   Our Annual Report on Form 10-K for the year ended March 31, 2000;

         (2)   Our Proxy  Statement,  filed with the Commission on July 10, 2000
               (except for the  Compensation  and Stock Option  Committee Report
               included therein); and

         (3)   The description of our common stock set forth in our Registration
               Statement  on Form 8-A,  including  any  subsequent  amendment or
               report filed for the purpose of updating that description.

         We will  furnish  to you,  without  charge,  on  your  written  or oral
request, a copy of any or all of the documents incorporated by reference herein,
other than  exhibits  to such  documents.  You should  direct any  requests  for
documents to Secretary, Cyanotech Corporation,  73-4460 Queen Kaahumanu Highway,
Suite 102, Kailua-Kona, Hawaii 96740, telephone: (808) 326-1353.

                                       12
<PAGE>

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14:  Other Expenses of Issuance and Distribution

         The  following  table sets forth the cost and  expenses  payable by the
registrant in connection with the sale of the securities being  registered.  The
registrant  will  bear  no  expenses  in  connection  with  any  sale  or  other
distribution by the selling  stockholders of the shares being  registered  other
than the expenses of preparation and distribution of this registration statement
and the prospectus  included in this registration  statement.  Such expenses are
set forth in the following  table. All of the amounts shown are estimates except
the SEC registration fee and the Nasdaq National Market Listing Fee.

         SEC registration fee                                           $   429
         NASDAQ National Market Listing fee                             $ 9,167
         Legal Fees and Expenses                                        $15,000
         Accounting Fees and Expenses                                   $ 7,000
         Miscellaneous expenses                                         $ 5,000
                                                                        -------
                      Total                                             $36,596

Item 15. Indemnification of Directors and Officers

        The Nevada Private  Corporation Law ("NPCL") provides that a corporation
may  indemnify  any person who was or is a party or is  threatened  to be made a
party, by reason of the fact that such person was an officer or director of such
corporation,  or is or was  serving  at the  request  of such  corporation  as a
director, officer, employee or agent of another corporation,  partnership, joint
venture, trust or other enterprise, to (x) any action or suit by or in the right
of the corporation  against  expenses,  including amounts paid in settlement and
attorneys'  fees,  actually and  reasonably  incurred,  in  connection  with the
defense or settlement  believed to be in, or not opposed to, the best  interests
of the corporation,  except that  indemnification may not be made for any claim,
issue or  matter  as to  which  such a person  has been  adjudged  by a court of
competent  jurisdiction  to be liable to the  corporation or for amounts paid in
settlement  to the  corporation  and (y) any other action or suit or  proceeding
against expenses,  including attorneys' fees, judgments,  fines and amounts paid
in  settlement,  actually and  reasonably  incurred,  if he or she acted in good
faith  and in a manner  which he or she  reasonably  believed  to be in,  or not
opposed to, reasonable cause to believe his or her conduct was unlawful.  To the
extent that a director,  officer,  employee or agent has been "successful on the
merits or otherwise" the corporation must indemnify such person. The articles of
incorporation  or bylaws may provide that the expenses of officers and directors
incurred in defending any such action must be paid as incurred and in advance of
the final  disposition  of such action.  The NPCL also permits the Registrant to
purchase and  maintain  insurance on behalf of the  Registrant's  directors  and
officers against any liability  arising out of their status as such,  whether or
not  Registrant  would have the power to indemnify  him against such  liability.
These  provisions  may be  sufficiently  broad to  indemnify  such  persons  for
liabilities arising under the Securities Act.

        The  Company's  Bylaws  provide that the Company  shall,  to the fullest
extent  permitted by  applicable  law,  indemnify any director or officer of the
Company in  connection  with certain  actions,  suits or  proceedings,  against,
expenses,  including  attorneys'  fees,  judgments,  fines and  amounts  paid in
settlement actually and reasonably incurred. The Company is also required to pay
any expenses  incurred by a director or officer in defending such an action,  in
advance of the final  disposition of such action.  The Company's  Bylaws further
provide that,  by  resolution  of the Board of  Directors,  such benefits may be
extended to employees, agents or other representatives of the Company.

        The NPCL provides that a  corporation's  articles of  incorporation  may
contain a provision  which  eliminates  or limits the  personal  liability  of a
director  or officer to the  corporation  or its  stockholders  for  damages for
breach  of  fiduciary  duty as a  director  or  officer,  provided  that  such a
provision  must not  eliminate  or limit the  liability of a director or officer
for: (a) acts or omissions  which  involve  intentional  misconduct,  fraud or a
knowing  violation  of law;  or (b) the  payment of illegal  distributions.  The
Company's Restated Articles of Incorporation include a provision eliminating the
personal  liability of directors  for breach of fiduciary  duty except that such
provision  will  not  eliminate  or  limit  any  liability  which  may not be so
eliminated or limited under applicable law.

        Under the terms of the  registration  rights  agreement with the selling
stockholders,  they and  registrant  have agreed to  indemnify  each other under
certain circumstances.

                                      II-1
<PAGE>

Item 16.  Exhibits.
<TABLE>
<CAPTION>
          Exhibit Number        Exhibit
          --------------        -------
<S>            <C>              <C>
               *5.1             Opinion of Woodburn and Wedge
              *23.1             Consent of KPMG LLP, Independent Certified Public Accountants
               23.2              Consent of Woodburn and Wedge (see Exhibit 5.1)
               24.1              Powers of Attorney (included on page II-4)
              *Previously filed
</TABLE>

Item 17.  Undertakings

1.   Insofar as indemnification for liabilities arising under the Securities Act
     of  1933,  as  amended,  may  be  permitted  to  directors,  officers,  and
     controlling persons of the Registrant pursuant to the provisions  described
     in Item 15 above, or otherwise, the Registrant has been advised that in the
     opinion of the Securities and Exchange  Commission such  indemnification is
     against  public policy as expressed in the  Securities  Act of 1933 and is,
     therefore,  unenforceable.  In the event  that a claim for  indemnification
     against  such  liabilities  (other  than the payment by the  Registrant  of
     expenses incurred or paid by a director,  officer or controlling  person of
     the Registrant in the successful defense of any action, suit or proceeding)
     is asserted by such director,  officer or controlling  person in connection
     with the securities being  registered,  the Registrant will,  unless in the
     opinion  of  its  counsel  the  matter  has  been  settled  by  controlling
     precedent,  submit to a court of appropriate  jurisdiction  the question of
     whether such indemnification by it is against public policy as expressed in
     the Act and will be governed by the final adjudication of such issue.

2.   The undersigned Registrant hereby undertakes:

     (a)  To file,  during the period in which offers or sales are being made, a
          post-effective amendment to this registration statement;

              (i)  To include any prospectus  required by Section  10(a)(3)
                   of the Securities Act of 1933;

             (ii)  To  reflect  in the  prospectus  any facts or events  arising
                   after the effective  date of the  registration  statement (or
                   the most  recent  post-effective  amendment  thereof)  which,
                   individually  or in the  aggregate,  represent a  fundamental
                   change  in the  information  set  forth  in the  registration
                   statement.  Notwithstanding  the  foregoing,  any increase or
                   decrease in volume of securities offered (if the total dollar
                   value of  securities  offered would not exceed that which was
                   registered) and any deviation from the low or high end of the
                   estimated maximum offering range may be reflected in the form
                   of  prospectus  filed with the  Commission  pursuant  to Rule
                   424(b) if, in the aggregate,  the changes in volume and price
                   represent  no more  than 20 per cent  change  in the  maximum
                   aggregate  offering  price set forth in the  "Calculation  of
                   Registration   Fee"  table  in  the  effective   registration
                   statement;

            (iii)  To include any material  information with respect to the plan
                   of distribution not previously  disclosed in the registration
                   statement or any material  change to such  information in the
                   registration statement;

          provided,  however, that subparagraphs (a)(i) and (a)(ii) do not apply
          if  the  information  required  to  be  included  in a  post-effective
          amendment to those  paragraphs is contained in periodic  reports filed
          by the  Registrant  pursuant  to section  13 or  section  15(d) of the
          Securities  Exchange Act of 1934 that are incorporated by reference in
          the registration statement.

     (b)  That,  for  the  purpose  of  determining   any  liability  under  the
          Securities Act of 1933,  each such  post-effective  amendment shall be
          deemed to be a new registration  statement  relating to the securities
          offered  therein,  and the  offering of such  securities  at that time
          shall be deemed to be the initial bona fide offering thereof.

     (c)  To remove from registration by means of a post-effective amendment any
          of  the  securities  being  registered  which  remain  unsold  at  the
          termination of the offering.

3.   The  undersigned   Registrant   hereby  undertakes  that  for  purposes  of
     determining  any liability under the Securities Act of 1933, each filing of
     the  Registrant's  annual report pursuant to section 13(a) or section 15(d)
     of the Securities Exchange
                                      II-2
<PAGE>
     Act of 1934 that is incorporated by reference in the Registration Statement
     shall  be  deemed  to be a  new  Registration  Statement  relating  to  the
     securities  offering  therein,  and the offering of such securities at that
     time shall be deemed to be the initial bona fide offering thereof.

4.   The  undersigned  registrant  hereby  undertakes  to deliver or cause to be
     delivered  with the  prospectus,  to each person to whom the  prospectus is
     sent or given,  the  latest  annual  report  to  security  holders  that is
     incorporated  by reference in the prospectus and furnished  pursuant to and
     meeting the  requirements  of Rule 14a-3 or Rule 14c-3 under the Securities
     Exchange Act of 1934; and, where interim financial  information required to
     be  presented  by  Article  3 of  Regulation  S-X are not set  forth in the
     prospectus, to deliver, or cause to be delivered to each person to whom the
     prospectus  is  sent  or  given,   the  latest  quarterly  report  that  is
     specifically  incorporated  by reference in the  prospectus to provide such
     interim financial information.

5.   Insofar as indemnification for liabilities arising under the Securities Act
     of 1933 may be permitted to directors,  officers and controlling persons of
     the  registrant  pursuant to the foregoing  provisions,  or otherwise,  the
     registrant  has been  advised  that in the  opinion of the  Securities  and
     Exchange  Commission  such  indemnification  is  against  public  policy as
     expressed in the Securities Act of 1933 and is,  therefore,  unenforceable.
     In the event  that a claim for  indemnification  against  such  liabilities
     (other than the payment by the registrant of expenses incurred or paid by a
     director, officer or controlling person of the registrant in the successful
     defense of any action,  suit or  proceeding)  is asserted by such director,
     officer or  controlling  person in  connection  with the  securities  being
     registered,  the registrant will,  unless in the opinion of its counsel the
     matter has been  settled  by  controlling  precedent,  submit to a court of
     appropriate jurisdiction the question whether such indemnification by it is
     against  public policy as expressed in the  Securities Act of 1933 and will
     be governed by the final adjudication of such issue.


                                   SIGNATURES

     Pursuant to the  requirements of the Securities Act of 1933, the Registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-3 and has  duly  caused  this  Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized in Kailua-Kona, Hawaii, on August 9, 2000.



                              CYANOTECH CORPORATION


                                By:/s/ Gerald R. Cysewski
                                   ------------------------------
                                       Gerald R. Cysewski
                                       Chief Executive Officer,
                                       President and Chairman of the Board






                                      II-3
<PAGE>

                                POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS that each person whose signature appears
below  constitutes  and appoints each of Ronald P. Scott and Gerald R. Cysewski,
with the power of  substitution,  his  attorney-in-fact,  to sign any  documents
relating  to this  Registration  Statement,  including  all  amendments  to this
Registration Statement (including post-effective amendments),  and to file same,
with  exhibits  thereto and other  documents in connection  therewith,  with the
Securities  and Exchange  Commission,  hereby  ratifying and confirming all that
said  attorney-in-fact,  or  their  substitutes,  may do or  cause to be done by
virtue thereof.

     Pursuant  to  the   requirements  of  the  Securities  Act  of  1933,  this
Registration  Statement  has  been  signed  by  the  following  persons  in  the
capacities and on the dates indicated.
<TABLE>
<CAPTION>
       SIGNATURE                            CAPACITY                                     DATE
       ---------                            --------                                     ----

<S>                             <C>                                                     <C>
/s/ Gerald R. Cysewski          Chairman of the Board,                                  August 9, 2000
----------------------          President and Chief Executive Officer
Gerald R. Cysewski              Director


/s/ Ronald P. Scott             Executive Vice President, Finance and                   August 9, 2000
----------------------          Administration, Chief Financial Officer and Chief
Ronald P. Scott                 Accounting Officer, Director

/s/ Eric H. Reichl              Director                                                August 9, 2000
----------------------
Eric H. Reichl

/s/ John T. Waldron             Director                                                August 9, 2000
----------------------
John T. Waldron

/s/ Paul C. Yuen                Director                                                August 9, 2000
----------------------
Paul C. Yuen
</TABLE>


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