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All answers having "Sea food?" as clue:

3 Character Answers:

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EEL

ROE



4 Character Answers:

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CLAM

EELS

KELP

ROES



5 Character Answers:

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CLAMS

CRABS



6 Character Answers:

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SHRIMP

SMELTS



8 Character Answers:

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PLANKTON

SCALLOPS