Flossing differs from snagging in that the snagged fish is involuntarily hooked by maneuvering the hook to impale the fish. Flossing involves the presentation of the hook and line in a manner whereby the fish voluntarily moves to take the line and the hook in its mouth, even if by accident.

Flossing is legal but Snagging is a crime.
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Why are "wild fish" made of meat?