<PAGE> PAGE 1
000 B000000 09/30/1999
000 C000000 756922
000 D000000 N
000 E000000 F
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 U
001 A000000 ADVANTUS MORTGAGE SECURITIES FUND, INC
001 B000000 811-4140
001 C000000 6516656169
002 A000000 400 NORTH ROBERT STREET
002 B000000 ST PAUL
002 C000000 MN
002 D010000 55101
002 D020000 2098
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 Y
007 B000000 3
007 C010100 1
007 C020100 CLASS A
007 C030100 N
007 C010200 2
007 C020200 CLASS B
007 C030200 N
007 C010300 3
007 C020300 CLASS C
007 C030300 N
007 C010400 4
007 C010500 5
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
062 A00AA00 Y
062 B00AA00 0.0
062 C00AA00 0.0
062 D00AA00 0.0
062 E00AA00 0.0
062 F00AA00 0.0
062 G00AA00 0.0
062 H00AA00 0.0
062 I00AA00 0.0
062 J00AA00 0.0
062 K00AA00 0.0
062 L00AA00 2.2
<PAGE> PAGE 2
062 M00AA00 0.0
062 N00AA00 35.0
062 O00AA00 0.0
062 P00AA00 0.0
062 Q00AA00 62.6
062 R00AA00 0.9
071 A00AA00 69278
071 B00AA00 62133
071 C00AA00 48901
071 D00AA00 127
072 A00AA00 12
074 N00AA00 55656
074 T00AA00 52799
075 A00AA00 0
075 B00AA00 41616
077 A000000 Y
080 A00AA00 FEDERAL COMPANY
080 C00AA00 14500
081 A00AA00 Y
081 B00AA00 51
082 A00AA00 Y
082 B00AA00 50
083 A00AA00 N
083 B00AA00 0
084 A00AA00 N
084 B00AA00 0
085 A00AA00 Y
085 B00AA00 N
034 000200 Y
035 000200 3
036 A000200 Y
036 B000200 0
SIGNATURE ROBERT E. HUNSTAD
TITLE PRESIDENT
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM
N-SAR AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FORM N-SAR.
</LEGEND>
<RESTATED>
<CIK> 0000756922
<NAME> MULTI CLASS ADVANTUS MORTGAGE SECURITIES
<SERIES>
<NUMBER> 100
<NAME> CLASS A
<MULTIPLIER> 1000
<CURRENCY> US
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> SEP-30-1999
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 53,895
<INVESTMENTS-AT-VALUE> 53,151
<RECEIVABLES> 2,367
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 138
<TOTAL-ASSETS> 55,656
<PAYABLE-FOR-SECURITIES> 2,857
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 0
<TOTAL-LIABILITIES> 2,857
<SENIOR-EQUITY> 51
<PAID-IN-CAPITAL-COMMON> 54,023
<SHARES-COMMON-STOCK> 3,262
<SHARES-COMMON-PRIOR> 3,002
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (534)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (744)
<NET-ASSETS> 33,617
<DIVIDEND-INCOME> 72
<INTEREST-INCOME> 3,674
<OTHER-INCOME> 0
<EXPENSES-NET> 599
<NET-INVESTMENT-INCOME> 3,147
<REALIZED-GAINS-CURRENT> (65)
<APPREC-INCREASE-CURRENT> (2,031)
<NET-CHANGE-FROM-OPS> 1,051
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 2,187
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 648
<NUMBER-OF-SHARES-REDEEMED> 526
<SHARES-REINVESTED> 138
<NET-CHANGE-IN-ASSETS> 6,109
<ACCUMULATED-NII-PRIOR> 23
<ACCUMULATED-GAINS-PRIOR> (468)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 288
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 724
<AVERAGE-NET-ASSETS> 33,509
<PER-SHARE-NAV-BEGIN> 10.75
<PER-SHARE-NII> 0.69
<PER-SHARE-GAIN-APPREC> (0.45)
<PER-SHARE-DIVIDEND> 0.69
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.30
<EXPENSE-RATIO> .95
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM N-SAR
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FORM N-SAR.
</LEGEND>
<RESTATED>
<CIK> 0000756922
<NAME> MULTI CLASS ADVANTUS MORTGAGE SECURITIES
<SERIES>
<NUMBER> 101
<NAME> CLASS B
<MULTIPLIER> 1000
<CURRENCY> US
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> SEP-30-1999
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 53,895
<INVESTMENTS-AT-VALUE> 53,151
<RECEIVABLES> 2,367
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 138
<TOTAL-ASSETS> 55,656
<PAYABLE-FOR-SECURITIES> 2,857
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 0
<TOTAL-LIABILITIES> 2,857
<SENIOR-EQUITY> 51
<PAID-IN-CAPITAL-COMMON> 54,023
<SHARES-COMMON-STOCK> 1,361
<SHARES-COMMON-PRIOR> 936
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (534)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (744)
<NET-ASSETS> 14,057
<DIVIDEND-INCOME> 72
<INTEREST-INCOME> 3,674
<OTHER-INCOME> 0
<EXPENSES-NET> 599
<NET-INVESTMENT-INCOME> 3,147
<REALIZED-GAINS-CURRENT> (65)
<APPREC-INCREASE-CURRENT> (2,031)
<NET-CHANGE-FROM-OPS> 1,051
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 706
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 603
<NUMBER-OF-SHARES-REDEEMED> 233
<SHARES-REINVESTED> 55
<NET-CHANGE-IN-ASSETS> 6,109
<ACCUMULATED-NII-PRIOR> 23
<ACCUMULATED-GAINS-PRIOR> (468)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 288
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 724
<AVERAGE-NET-ASSETS> 12,186
<PER-SHARE-NAV-BEGIN> 10.77
<PER-SHARE-NII> 0.61
<PER-SHARE-GAIN-APPREC> (0.44)
<PER-SHARE-DIVIDEND> 0.61
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.33
<EXPENSE-RATIO> 1.70
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM
N-SAR AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FORM N-SAR.
</LEGEND>
<RESTATED>
<CIK> 0000756922
<NAME> MULTI CLASS ADVANTUS MORTGAGE SECURITIES
<SERIES>
<NUMBER> 102
<NAME> CLASS C
<MULTIPLIER> 1000
<CURRENCY> US
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> SEP-30-1999
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 53,895
<INVESTMENTS-AT-VALUE> 53,151
<RECEIVABLES> 2,367
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 138
<TOTAL-ASSETS> 55,656
<PAYABLE-FOR-SECURITIES> 2,857
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 0
<TOTAL-LIABILITIES> 2,857
<SENIOR-EQUITY> 51
<PAID-IN-CAPITAL-COMMON> 54,023
<SHARES-COMMON-STOCK> 497
<SHARES-COMMON-PRIOR> 404
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (534)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (744)
<NET-ASSETS> 5,126
<DIVIDEND-INCOME> 72
<INTEREST-INCOME> 3,674
<OTHER-INCOME> 0
<EXPENSES-NET> 599
<NET-INVESTMENT-INCOME> 3,147
<REALIZED-GAINS-CURRENT> (65)
<APPREC-INCREASE-CURRENT> (2,031)
<NET-CHANGE-FROM-OPS> 1,051
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 251
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 441
<NUMBER-OF-SHARES-REDEEMED> 369
<SHARES-REINVESTED> 21
<NET-CHANGE-IN-ASSETS> 6,109
<ACCUMULATED-NII-PRIOR> 23
<ACCUMULATED-GAINS-PRIOR> (468)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 288
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 724
<AVERAGE-NET-ASSETS> 4,334
<PER-SHARE-NAV-BEGIN> 10.76
<PER-SHARE-NII> 0.61
<PER-SHARE-GAIN-APPREC> (0.45)
<PER-SHARE-DIVIDEND> 0.61
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.31
<EXPENSE-RATIO> 1.70
</TABLE>
