<PAGE> PAGE 1
000 A000000 04/30/2000
000 C000000 0000018180
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 U
001 A000000 CASTLE CONVERTIBLE FUND, INC.
001 B000000 811-2213
001 C000000 2128068800
002 A000000 1 WORLD TRADE CENTER
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10048
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
020 A000001 W.H REAVES & CO., INC.
020 B000001 22-2169006
020 C000001 10
020 A000002 BANC OF AMERICA SECURITIES
020 B000002 56-2058405
020 C000002 5
020 A000003 FLEET BOSTON ROBINSON STEPHENS, INC
020 B000003 04-3320136
020 C000003 3
020 A000004 GOLDMAN SACHS & CO.
020 B000004 13-5108880
020 C000004 2
020 A000005 BAIRD PATRICK & CO., INC.
020 B000005 13-2766571
020 C000005 1
020 A000006 SALOMON SMITH BARNEY INC.
020 B000006 11-2418191
020 C000006 1
020 A000007 ROBERT W GAIRD & CO., INC.
020 B000007 39-6037917
020 C000007 1
020 C000008 0
020 C000009 0
020 C000010 0
021 000000 23
022 A000001 MERRILL LYNCH PIERCE FENNER & SMITH INC
022 B000001 13-5674085
022 C000001 84827
022 D000001 7771
<PAGE> PAGE 2
022 A000002 MORGAN STANLEY DEAN WITTER & CO.
022 B000002 13-2655998
022 C000002 4993
022 D000002 2368
022 A000003 BAIRD PATRICK & CO. INC.
022 B000003 13-2766571
022 C000003 0
022 D000003 6999
022 A000004 CREDIT SUISSE FIRST BOSTON CORP.
022 B000004 13-5659485
022 C000004 3000
022 D000004 1696
022 A000005 GOLDMAN SACHS & CO.
022 B000005 13-5108880
022 C000005 2339
022 D000005 2006
022 A000006 BANC OF AMERICA SECURITIES
022 B000006 56-2058405
022 C000006 1063
022 D000006 1421
022 A000007 WILLIAM BLAIR & COMPANY LLC.
022 B000007 36-2214610
022 C000007 1773
022 D000007 505
022 A000008 SALOMON SMITH BARNEY INC.
022 B000008 11-2418191
022 C000008 900
022 D000008 1157
022 A000009 SCHRODER & CO.,INC.
022 B000009 13-2697272
022 C000009 0
022 D000009 3040
022 A000010 STATE STREET BANK AND TRUST CO.
022 B000010 0418674455
022 C000010 1200
022 D000010 0
023 C000000 101968
023 D000000 27166
062 A000000 Y
062 B000000 0.0
062 C000000 0.0
062 D000000 0.0
062 E000000 0.0
062 F000000 0.0
062 G000000 0.0
062 H000000 0.0
062 I000000 9.6
062 J000000 0.0
062 K000000 0.0
062 L000000 0.0
062 M000000 0.0
<PAGE> PAGE 3
062 N000000 0.0
062 O000000 0.0
062 P000000 37.7
062 Q000000 0.0
062 R000000 52.2
063 A000000 0
063 B000000 5.0
071 A000000 23718
071 B000000 26849
071 C000000 54541
071 D000000 43.5
072 A000000 6
072 B000000 796
072 C000000 1106
072 D000000 0
072 E000000 0
072 F000000 225
072 G000000 0
072 H000000 0
072 I000000 9
072 J000000 5
072 K000000 0
072 L000000 23
072 M000000 15
072 N000000 0
072 O000000 5
072 P000000 0
072 Q000000 9
072 R000000 15
072 S000000 2
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 5
072 X000000 312
072 Y000000 0
072 Z000000 1590
072AA000000 5967
072BB000000 2966
072CC010000 1130
072CC020000 0
072DD010000 1476
072DD020000 0
072EE000000 671
073 A010000 0.6600
073 A020000 0.0000
073 B000000 0.3000
073 C000000 0.0000
074 A000000 43
074 B000000 0
074 C000000 5946
<PAGE> PAGE 4
074 D000000 23464
074 E000000 27727
074 F000000 4720
074 G000000 0
074 H000000 0
074 I000000 0
074 J000000 481
074 K000000 0
074 L000000 567
074 M000000 7
074 N000000 62955
074 O000000 735
074 P000000 38
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 26
074 S000000 0
074 T000000 62156
074 U010000 2236003
074 U020000 0
074 V010000 27.80
074 V020000 0.00
074 W000000 0.0000
074 X000000 877
074 Y000000 0
075 A000000 0
075 B000000 60169
076 000000 20.50
077 A000000 N
077 B000000 N
077 C000000 N
077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 N
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
077 Q010000 N
077 Q020000 N
077 Q030000 N
078 000000 N
SIGNATURE GREGORY S. DUCH
TITLE TREASURER
