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All answers having "Fishes" as clue:

4 Character Answers:

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CARP

DAPS

EELS

GARS



5 Character Answers:

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HAKES

POUTS

TUNAS



6 Character Answers:

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ANGLES

TROLLS



7 Character Answers:

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REMORAS



8 Character Answers:

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SARDINES



21 Character Answers:

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BOLGERMILLANDBRADBURY