PAGE 1
000 A000000 04/30/2008
000 C000000 0001171471
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 CALAMOS CONVERTIBLE OPPORTUNITIES&INCOME FUND
001 B000000 811-21080
001 C000000 6302457200
002 A000000 2020 CALAMOS COURT
002 B000000 NAPERVILLE
002 C000000 IL
002 D010000 60563
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 1
007 C010100 1
008 A000001 CALAMOS ADVISORS LLC
008 B000001 A
008 C000001 801-29688
008 D010001 NAPERVILLE
008 D020001 IL
008 D030001 60563
010 A000001 State Street Bank and Trust Company
010 B000001 028-00733
010 C010001 Boston
010 C020001 MA
010 C030001 02111
012 A000001 THE BANK OF NEW YORK (COMMON)
012 B000001 85-05006
012 C010001 NEW YORK
012 C020001 NY
012 C030001 10286
012 A000002 THE BANK OF NEW YORK (PREFERRED)
012 B000002 85-05006
012 C010002 NEW YORK
012 C020002 NY
012 C030002 10286
013 A000001 Deloitte & Touche LLP
013 B010001 Chicago
013 B020001 IL
013 B030001 60606
014 A000001 CALAMOS FINANCIAL SERVICES LLC
014 B000001 8-37854
015 A000001 THE BANK OF NEW YORK
PAGE 2
015 B000001 C
015 C010001 NEW YORK
015 C020001 NY
015 C030001 10286
015 E010001 X
015 A000002 EUROCLEAR BANK
015 B000002 S
015 C010002 BRUSSELS
015 D010002 BELGIUM
015 E040002 X
018 000000 Y
019 A000000 Y
019 B000000 19
019 C000000 CALAMOSINV
020 A000001 SUSQUEHANNA CAPITAL GROUP
020 B000001 23-2626048
020 C000001 58
020 A000002 GOLDMAN, SACHS & CO.
020 B000002 13-5108880
020 C000002 54
020 A000003 MERRILL LYNCH
020 B000003 13-2740599
020 C000003 35
020 A000004 LAZARD FRERES & CO. LLC
020 B000004 13-5545100
020 C000004 22
020 A000005 MORGAN STANLEY
020 B000005 13-2655998
020 C000005 10
020 A000006 DEUTSCHE BANK SECURITIES, INC.
020 B000006 13-2730828
020 C000006 9
020 A000007 LEHMAN BROTHERS
020 B000007 13-2518466
020 C000007 9
020 A000008 BANK OF NEW YORK
020 B000008 13-3894751
020 C000008 4
020 A000009 CITIGROUP GLOBAL MARKETS, INC.
020 B000009 11-2418191
020 C000009 4
020 A000010 BEAR STEARNS & CO., INC.
020 B000010 13-3299429
020 C000010 3
021 000000 208
022 A000001 STATE STREET CORP.
022 B000001 04-2456637
022 C000001 331047
022 D000001 345016
022 A000002 LEHMAN BROTHERS
022 B000002 13-2518466
PAGE 3
022 C000002 90892
022 D000002 33042
022 A000003 MERRILL LYNCH
022 B000003 13-2740599
022 C000003 37232
022 D000003 74451
022 A000004 GOLDMAN, SACHS & CO.
022 B000004 13-5108880
022 C000004 32982
022 D000004 64211
022 A000005 J.P. MORGAN SECURITIES INC.
022 B000005 13-3224016
022 C000005 55390
022 D000005 13103
022 A000006 CITIGROUP GLOBAL MARKETS, INC.
022 B000006 11-2418191
022 C000006 37635
022 D000006 28683
022 A000007 CREDIT SUISSE FIRST BOSTON
022 B000007 13-2853402
022 C000007 37949
022 D000007 11292
022 A000008 BARCLAYS GLOBAL INVESTORS SERVICES
022 B000008 94-3231066
022 C000008 34994
022 D000008 11939
022 A000009 KBC Financial Group
022 B000009 06-1548680
022 C000009 24428
022 D000009 21503
022 A000010 BANK OF AMERICA
022 B000010 56-0906609
022 C000010 31483
022 D000010 9714
023 C000000 788136
023 D000000 803719
024 000000 Y
025 A000001 BANK OF AMERICA
025 B000001 56-0906609
025 C000001 E
025 D000001 16008
025 A000002 CITIGROUP GLOBAL MARKETS, INC.
025 B000002 11-2418191
025 C000002 E
025 D000002 15727
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
PAGE 4
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
042 H000000 0
PAGE 5
043 000000 0
044 000000 0
045 000000 Y
046 000000 N
047 000000 Y
048 000000 0.800
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
054 O000000 N
055 A000000 Y
PAGE 6
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 0.0
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 0.6
062 L000000 12.8
062 M000000 0.0
062 N000000 0.0
062 O000000 0.0
062 P000000 122.9
062 Q000000 0.0
062 R000000 27.6
063 A000000 0
063 B000000 8.1
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 Y
070 C010000 Y
070 C020000 N
070 D010000 Y
070 D020000 Y
070 E010000 Y
070 E020000 N
PAGE 7
070 F010000 Y
070 F020000 N
070 G010000 Y
070 G020000 N
070 H010000 Y
070 H020000 N
070 I010000 Y
070 I020000 N
070 J010000 Y
070 J020000 Y
070 K010000 Y
070 K020000 Y
070 L010000 Y
070 L020000 Y
070 M010000 Y
070 M020000 Y
070 N010000 Y
070 N020000 Y
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 Y
070 R020000 N
071 A000000 362282
071 B000000 377094
071 C000000 1042554
071 D000000 35
072 A000000 6
072 B000000 29933
072 C000000 4024
072 D000000 0
072 E000000 667
072 F000000 4355
072 G000000 0
072 H000000 0
072 I000000 524
072 J000000 8
072 K000000 0
072 L000000 74
072 M000000 27
072 N000000 22
072 O000000 0
072 P000000 0
072 Q000000 91
072 R000000 39
072 S000000 27
072 T000000 13
072 U000000 0
PAGE 8
072 V000000 0
072 W000000 30
072 X000000 5210
072 Y000000 1004
072 Z000000 30418
072AA000000 51872
072BB000000 34816
072CC010000 0
072CC020000 83351
072DD010000 3259
072DD020000 0
072EE000000 5764
073 A010000 0.7100
073 A020000 0.0000
073 B000000 0.1700
073 C000000 0.0000
074 A000000 4
074 B000000 0
074 C000000 7876
074 D000000 860029
074 E000000 155072
074 F000000 0
074 G000000 4267
074 H000000 0
074 I000000 38092
074 J000000 10407
074 K000000 0
074 L000000 99342
074 M000000 204
074 N000000 1175293
074 O000000 3753
074 P000000 629
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 2622
074 R040000 83787
074 S000000 384293
074 T000000 700209
074 U010000 48112
074 U020000 0
074 V010000 14.55
074 V020000 0.00
074 W000000 0.0000
074 X000000 136
074 Y000000 119427
075 A000000 0
075 B000000 710673
076 000000 15.40
077 A000000 N
078 000000 N
PAGE 9
080 C000000 0
081 B000000 0
082 B000000 0
083 B000000 0
084 B000000 0
086 A010000 173
086 A020000 2533
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 128117108
087 A030000 CHI
087 B010000 PREFERRED STOCK
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 Y
SIGNATURE RON HAMAKER
TITLE ASSISTANT TREASURER