Cod: Found in compounds such as: 'Codwrangle', 'Codratic Seaquation", etc.
Crab: Seas.
Crevette: Posh necktie.
Eel: Dickensian: See cure.
Fish: Dickensian: Aspiration.
Herring: Sounds like.
Lobster: Lember of a lob.
Mussel: Likely to do well on eBay.
Plaice: Pretentious dramas.
Ray: Limp cheer.
Scampi: Deceitful pee.
Shad: Abbr. She formerly had.
Trout: Doh reh.
Whelk: Informal: No thanks expected.
Whiting: A form of communication.