Usage patterns
〈場所〉で貝を拾うto pick up shells at a place (e.g. a beach)
I picked up shells on the beach.
貝を養殖するto farm/cultivate shellfish
In this region, they farm shellfish such as oysters.
貝の身を取り出すto take the meat out of a shellfish
I took the meat out of the shellfish and used it in cooking.
Expressions
貝になるclam up; keep one's mouth shut; say nothing 貝を吹くblow a conch; blow a trumpet shell; blow the war horn