You asked:

Is crayfish a shellfish?

No
crayfish
crayfish

Crayfishonly wierd people from south carolina call them "crawdads" or"crawfish"', – members of the superfamilies Astacoidea and Parastacoidea –, freshwater crustaceans resembling smalllobsters, to which they are related

Olympia oyster, Ostreola conchaphila, a native oyster of the Pacific coast of North America from Alaska to Mexico

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