PAGE  1
000 A000000 06/30/2004
000 C000000 809559
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 TCW CONVERTIBLE SECURITIES FUND, INC.
001 B000000 811-4980
001 C000000 2132440000
002 A000000 865 SOUTH FIGUEROA STREET
002 B000000 LOS ANGELES
002 C000000 CA
002 D010000 90017
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 N
007 B000000  0
007 C010100  1
007 C010200  2
007 C010300  3
007 C010400  4
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
008 A000001 TCW INVESTMENT MANAGEMENT COMPANY
008 B000001 A
008 C000001 801-29075
008 D010001 LOS ANGELES
008 D020001 CA
008 D030001 90017
010 A000001 INVESTORS BANK & TRUST COMPANY
010 B000001 85-720
010 C010001 BOSTON
010 C020001 MA
010 C030001 02116
012 A000001 THE BANK OF NEW YORK
012 B000001 84-3161670
012 C010001 NEW YORK
012 C020001 NY
012 C030001 10277
012 C040001 0770
013 A000001 DELOITTE & TOUCHE LLP
013 B010001 LOS ANGELES
      PAGE  2
013 B020001 CA
013 B030001 90071
013 B040001 2472
014 A000001 TCW BROKERAGE SERVICES
014 B000001 8-31114
014 A000002 SG COWEN SECURITIES CORP., INC.
014 B000002 8-022522
014 A000003 FIMAT USA, INC.
014 B000003 8-047023
015 A000001 INVESTORS BANK & TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02116
015 E010001 X
015 A000002 EUROCLEAR
015 B000002 S
015 C010002 BRUSSELS
015 D010002 EUROCLEAR
015 E040002 X
018  000000 Y
019 A000000 N
019 B000000    0
020 A000001 GOLDMAN SACHS GROUP, INC.
020 B000001 13-5108880
020 C000001     19
020 A000002 MERRILL LYNCH PIERCE FENNER & SMITH, INC.
020 B000002 13-5674085
020 C000002     11
020 A000003 MORGAN STANLEY
020 B000003 13-2655998
020 C000003      9
020 A000004 BEAR STEARNS COS., INC.
020 B000004 13-3299429
020 C000004      6
020 A000005 LEHMAN BROTHERS
020 B000005 13-2518466
020 C000005      4
020 A000006 OSCAR GRUSS & SON., INC.
020 B000006 13-2913779
020 C000006      3
020 A000007 CITIGROUP GLOBAL MARKETS, INC.
020 B000007 11-2418191
020 C000007      3
020 A000008 BANC OF AMERICA SECURITIES LLC
020 B000008 56-2058405
020 C000008      2
020 A000009 FRANK RUSSELL SECURITIES, INC.
020 B000009 91-0604934
020 C000009      1
020 A000010 CREDIT SUISSE FIRST BOSTON, INC.
      PAGE  3
020 B000010 13-2853402
020 C000010      1
021  000000       62
022 A000001 GOLDMAN SACHS GROUP, INC.
022 B000001 13-5108880
022 C000001     17547
022 D000001     34823
022 A000002 LEHMAN BROTHERS
022 B000002 13-2518466
022 C000002     12852
022 D000002     25587
022 A000003 MERRILL LYNCH PIERCE FENNER & SMITH, INC.
022 B000003 13-5674085
022 C000003     13328
022 D000003     23650
022 A000004 MORGAN STANLEY
022 B000004 13-2655998
022 C000004     11315
022 D000004     11433
022 A000005 BANC OF AMERICA SECURITIES LLC
022 B000005 56-2058405
022 C000005     14597
022 D000005      5907
022 A000006 UBS SECURITIES LLC
022 B000006 13-3873456
022 C000006     11441
022 D000006      4867
022 A000007 BEAR STEARNS COS., INC.
022 B000007 13-3299429
022 C000007      9874
022 D000007      2976
022 A000008 DEUTSCHE BANK AG
022 B000008 13-2730828
022 C000008      4372
022 D000008      6545
022 A000009 CIBC WORLD MARKETS CORP.
022 B000009 13-2798343
022 C000009      9989
022 D000009       549
022 A000010 THOMAS WEISEL PARTNERS LLC
022 B000010 94-3310172
022 C000010         0
022 D000010     10169
023 C000000     115561
023 D000000     136548
024  000000 Y
025 A000001 BEAR STEARNS COS., INC., FIFTH THIRD BANCORP
025 B000001 13-3299429
025 C000001 D
025 D000001    3201
025 A000002 BEAR STEARNS COS., INC.
      PAGE  4
025 B000002 13-3299429
025 C000002 D
025 D000002     542
025 A000003 CREDIT SUISSE FIRST BOSTON CORP.
025 B000003 13-2853402
025 C000003 D
025 D000003     813
025 A000004 LEHMAN BROTHERS HOLDINGS, INC.
025 B000004 13-3216325
025 C000004 D
025 D000004    5568
025 A000005 MERRILL LYNCH & CO., INC.
025 B000005 13-2740599
025 C000005 D
025 D000005    1442
025 A000006 MORGAN STANLEY, CISCO SYSTEMS, INC.
025 B000006 13-2655998
025 C000006 D
025 D000006    6613
025 A000007 MORGAN STANLEY, THE WALT DISNEY CO.
025 B000007 13-2655998
025 C000007 D
025 D000007    6016
025 D000008       0
026 A000000 N
026 B000000 Y
026 C000000 Y
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027  000000 N
028 A010000         0
028 A020000         0
028 A030000         0
028 A040000         0
028 B010000         0
028 B020000         0
028 B030000         0
028 B040000         0
028 C010000         0
028 C020000         0
028 C030000         0
028 C040000         0
028 D010000         0
028 D020000         0
028 D030000         0
028 D040000         0
028 E010000         0
      PAGE  5
028 E020000         0
028 E030000         0
028 E040000         0
028 F010000         0
028 F020000         0
028 F030000         0
028 F040000         0
028 G010000         0
028 G020000         0
028 G030000         0
028 G040000         0
028 H000000         0
030 A000000      0
030 B000000  0.00
030 C000000  0.00
031 A000000      0
031 B000000      0
032  000000      0
033  000000      0
035  000000      0
036 B000000      0
038  000000      0
042 A000000   0
042 B000000   0
042 C000000   0
042 D000000   0
042 E000000   0
042 F000000   0
042 G000000   0
042 H000000   0
043  000000      0
044  000000      0
045  000000 Y
046  000000 N
047  000000 Y
048  000000  0.000
048 A010000   100000
048 A020000 0.750
048 B010000        0
048 B020000 0.000
048 C010000        0
048 C020000 0.000
048 D010000        0
048 D020000 0.000
048 E010000        0
048 E020000 0.000
048 F010000        0
048 F020000 0.000
048 G010000        0
048 G020000 0.000
048 H010000        0
      PAGE  6
048 H020000 0.000
048 I010000        0
048 I020000 0.000
048 J010000        0
048 J020000 0.000
048 K010000   100000
048 K020000 0.500
049  000000 N
050  000000 N
051  000000 N
052  000000 N
053 A000000 N
054 A000000 Y
054 B000000 N
054 C000000 N
054 D000000 N
054 E000000 N
054 F000000 N
054 G000000 N
054 H000000 Y
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 N
054 M000000 Y
054 N000000 N
054 O000000 N
055 A000000 N
055 B000000 N
056  000000 Y
057  000000 N
058 A000000 N
059  000000 Y
060 A000000 Y
060 B000000 Y
061  000000        0
062 A000000 Y
062 B000000   0.0
062 C000000   0.2
062 D000000   0.0
062 E000000   0.0
062 F000000   0.0
062 G000000   0.0
062 H000000   0.0
062 I000000   0.0
062 J000000   0.0
062 K000000   0.0
062 L000000  17.2
062 M000000   0.0
062 N000000   0.0
062 O000000   0.0
      PAGE  7
062 P000000  51.6
062 Q000000   0.0
062 R000000  48.2
063 A000000   0
063 B000000 12.3
064 A000000 N
064 B000000 N
066 A000000 Y
066 B000000 N
066 C000000 N
066 D000000 N
066 E000000 N
066 F000000 N
066 G000000 Y
067  000000 N
068 A000000 N
068 B000000 N
069  000000 N
070 A010000 Y
070 A020000 N
070 B010000 Y
070 B020000 N
070 C010000 N
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 N
070 E020000 N
070 F010000 Y
070 F020000 N
070 G010000 N
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 N
070 K010000 Y
070 K020000 N
070 L010000 Y
070 L020000 Y
070 M010000 N
070 M020000 N
070 N010000 Y
070 N020000 Y
070 O010000 Y
070 O020000 N
070 P010000 N
070 P020000 N
070 Q010000 N
      PAGE  8
070 Q020000 N
070 R010000 Y
070 R020000 N
071 A000000    150711
071 B000000    153613
071 C000000    276161
071 D000000   55
072 A000000  6
072 B000000     1862
072 C000000     3469
072 D000000        0
072 E000000        0
072 F000000      823
072 G000000       48
072 H000000        0
072 I000000       33
072 J000000       11
072 K000000        0
072 L000000       20
072 M000000       43
072 N000000        0
072 O000000        0
072 P000000        0
072 Q000000       31
072 R000000       22
072 S000000       32
072 T000000        0
072 U000000        0
072 V000000        0
072 W000000       88
072 X000000     1151
072 Y000000        0
072 Z000000     4180
072AA000000    18414
072BB000000     1730
072CC010000        0
072CC020000    12101
072DD010000     3889
072DD020000        0
072EE000000        0
073 A010000   0.0800
073 A020000   0.0000
073 B000000   0.0000
073 C000000   0.0000
074 A000000        0
074 B000000        0
074 C000000    48441
074 D000000   143653
074 E000000   134089
074 F000000      360
074 G000000        0
      PAGE  9
074 H000000        0
074 I000000        0
074 J000000        0
074 K000000        0
074 L000000     1251
074 M000000        0
074 N000000   327794
074 O000000        0
074 P000000      136
074 Q000000        0
074 R010000        0
074 R020000        0
074 R030000        0
074 R040000    49120
074 S000000        0
074 T000000   278538
074 U010000    48610
074 U020000        0
074 V010000     5.73
074 V020000     0.00
074 W000000   0.0000
074 X000000     2100
074 Y000000        0
075 A000000        0
075 B000000   278306
076  000000     4.84
077 A000000 N
078  000000 N
086 A010000      0
086 A020000      0
086 B010000    899
086 B020000   4698
086 C010000      0
086 C020000      0
086 D010000      0
086 D020000      0
086 E010000      0
086 E020000      0
086 F010000      0
086 F020000      0
087 A010000 COMMON STOCK
087 A020000 872340104
087 A030000 CVT
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 N
SIGNATURE   DAVID S. DEVITO
TITLE       TREASURER