PAGE  1
000 A000000 08/31/2013
000 C000000 0000896665
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 BLACKROCK SENIOR HIGH INCOME FUND, INC.
001 B000000 811-07456
001 C000000 8004417762
002 A000000 100 BELLEVUE PARKWAY
002 B000000 WILMINGTON
002 C000000 DE
002 D010000 19809
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 N
007 B000000  0
007 C010100  1
008 A000001 BLACKROCK ADVISORS, LLC
008 B000001 A
008 C000001 801-47710
008 D010001 WILMINGTON
008 D020001 DE
008 D030001 19809
008 A000002 BLACKROCK FINANCIAL MANAGEMENT, INC.
008 B000002 S
008 C000002 801-48433
008 D010002 NEW YORK
008 D020002 NY
008 D030002 10055
012 A000001 COMPUTERSHARE TRUST COMPANY, N.A.
012 B000001 85-11340
012 C010001 CANTON
012 C020001 MA
012 C030001 02021
013 A000001 DELOITTE & TOUCHE LLP
013 B010001 BOSTON
013 B020001 MA
013 B030001 02116
014 A000001 BLACKROCK CAPITAL MARKETS, LLC
014 B000001 8-67827
014 A000002 BLACKROCK EXECUTION SERVICES
014 B000002 8-48719
014 A000003 BLACKROCK INVESTMENTS, LLC
014 B000003 8-48436
014 A000004 HARRIS WILLIAMS LLC
      PAGE  2
014 B000004 8-53380
014 A000005 PNC CAPITAL MARKETS, INC.
014 B000005 8-32493
014 A000006 PNC INVESTMENTS LLC
014 B000006 8-66195
015 A000001 THE BANK OF NEW YORK MELLON
015 B000001 C
015 C010001 NEW YORK
015 C020001 NY
015 C030001 10286
015 E010001 X
015 A000002 J.P. MORGAN CHASE BANK
015 B000002 S
015 C010002 NEW YORK
015 C020002 NY
015 C030002 10017
015 E010002 X
015 A000003 CIBC MELLON TRUST CO
015 B000003 S
015 C010003 CANADA
015 D010003 CANADA
015 E040003 X
015 A000004 THE BANK OF NEW YORK, LONDON
015 B000004 S
015 C010004 IRELAND
015 D010004 IRELAND
015 E040004 X
015 A000005 BNY MELLON SA/NV ASSET SERVICING
015 B000005 S
015 C010005 FRANKFURT
015 D010005 GERMANY
015 E040005 X
015 A000006 BANK OF TOYKO MITSBUBISHI UFJ LTD, TOKYO
015 B000006 S
015 C010006 TOKYO
015 D010006 JAPAN
015 E040006 X
015 A000007 THE BANK OF NEW YORK MELLON SA/NV
015 B000007 S
015 C010007 NETHERLANDS
015 D010007 NETHERLANDS
015 E040007 X
015 A000008 INTESA SANPAULO S.P.A
015 B000008 S
015 C010008 ITALY
015 D010008 ITALY
015 E040008 X
018  000000 Y
019 A000000 Y
019 B000000  290
019 C000000 BLKRKADVSR
      PAGE  3
020 A000001 JONES & ASSOCIATES, INC.
020 C000001      5
021  000000        5
022 A000001 BLK LIQUIDITY FUNDS, TEMPFUND, INSTIT. CLASS
022 B000001 52-0983343
022 C000001     89037
022 D000001     91485
022 A000002 DEUTSCHE BANK SECURITIES INC.
022 B000002 13-2730828
022 C000002     19447
022 D000002     10709
022 A000003 J.P. MORGAN SECURITIES INC
022 B000003 13-3379014
022 C000003     24748
022 D000003      5396
022 A000004 CREDIT SUISSE
022 B000004 13-3442768
022 C000004     15157
022 D000004      9906
022 A000005 CITIGROUP GLOBAL MARKETS INC
022 B000005 11-2418191
022 C000005     11404
022 D000005      8492
022 A000006 BARCLAYS CAPITAL INC.
022 B000006 06-1031656
022 C000006      8159
022 D000006      7158
022 A000007 MORGAN STANLEY
022 B000007 36-3145972
022 C000007      7936
022 D000007      5944
022 A000008 GOLDMAN, SACHS & CO.
022 B000008 13-5108880
022 C000008      8229
022 D000008      4665
022 A000009 BANK OF AMERICA CORP
022 B000009 56-0906609
022 C000009      7381
022 D000009      5301
022 A000010 BANK OF NEW YORK
022 B000010 13-4941102
022 C000010      7897
022 D000010      2916
023 C000000     210488
023 D000000     164745
024  000000 N
026 A000000 N
026 B000000 N
026 C000000 N
026 D000000 Y
026 E000000 N
      PAGE  4
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
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
      PAGE  5
042 H000000   0
043  000000      0
044  000000      0
045  000000 Y
046  000000 N
047  000000 Y
048  000000  0.500
048 A010000        0
048 A020000 0.000
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
048 H020000 0.000
048 I010000        0
048 I020000 0.000
048 J010000        0
048 J020000 0.000
048 K010000        0
048 K020000 0.000
049  000000 N
050  000000 N
051  000000 N
052  000000 N
053 A000000 Y
053 B000000 Y
053 C000000 N
054 A000000 Y
054 B000000 Y
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
055 A000000 Y
      PAGE  6
055 B000000 Y
056  000000 Y
057  000000 N
058 A000000 N
059  000000 Y
060 A000000 N
060 B000000 N
061  000000        0
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   0.0
062 J000000   0.0
062 K000000   0.0
062 L000000   0.8
062 M000000   0.0
062 N000000   0.0
062 O000000   0.0
062 P000000  55.0
062 Q000000  81.0
062 R000000   1.6
063 A000000   0
063 B000000  6.3
064 A000000 N
064 B000000 Y
065  000000 N
066 A000000 N
067  000000 N
068 A000000 N
068 B000000 N
069  000000 N
070 A010000 Y
070 A020000 N
070 B010000 N
070 B020000 N
070 C010000 Y
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 Y
070 E020000 N
070 F010000 N
070 F020000 N
070 G010000 Y
070 G020000 N
070 H010000 N
      PAGE  7
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 N
070 K010000 Y
070 K020000 Y
070 L010000 Y
070 L020000 Y
070 M010000 Y
070 M020000 Y
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 Y
070 P010000 Y
070 P020000 Y
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000    100617
071 B000000    120169
071 C000000    354445
071 D000000   28
072 A000000  6
072 B000000     9979
072 C000000        6
072 D000000        0
072 E000000        0
072 F000000      871
072 G000000       27
072 H000000        0
072 I000000       28
072 J000000       18
072 K000000        0
072 L000000       10
072 M000000       15
072 N000000        5
072 O000000        0
072 P000000      471
072 Q000000        0
072 R000000       39
072 S000000       27
072 T000000        0
072 U000000        0
072 V000000        0
072 W000000       27
072 X000000     1538
072 Y000000        1
072 Z000000     8448
      PAGE  8
072AA000000     2543
072BB000000        0
072CC010000        0
072CC020000     6368
072DD010000     8418
072DD020000        0
072EE000000        0
073 A010000   0.1480
073 A020000   0.0000
073 B000000   0.0000
073 C000000   0.0000
074 A000000       43
074 B000000        0
074 C000000     2058
074 D000000   329000
074 E000000     1896
074 F000000     3557
074 G000000        0
074 H000000        0
074 I000000      400
074 J000000     3180
074 K000000        0
074 L000000     3387
074 M000000        3
074 N000000   343524
074 O000000    12623
074 P000000      141
074 Q000000    87000
074 R010000        0
074 R020000        0
074 R030000        0
074 R040000      282
074 S000000        0
074 T000000   243478
074 U010000    56887
074 U020000        0
074 V010000     4.28
074 V020000     0.00
074 W000000   0.0000
074 X000000    21348
074 Y000000    10711
075 A000000        0
075 B000000   247517
076  000000     3.90
077 A000000 Y
077 O000000 Y
078  000000 Y
080 C000000        0
081 B000000   0
082 B000000        0
083 B000000        0
      PAGE  9
084 B000000        0
086 A010000     34
086 A020000    149
086 B010000      0
086 B020000      0
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 09255T109
087 A030000 ARK
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 N
SIGNATURE   NEAL J. ANDREWS
TITLE       CFO