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Definitions for by-catch. Here are all the possible meanings and translations of the word by-catch. Princeton's WordNet(0.00 / 0 votes)Rate this definition: by-catch, bycatch(noun) unwanted marine creatures that are caught in the nets while fishing for another species. thousands of dolphins and porpoises and whales are killed as part of the by-catch each year.
hook - catch with a hook; hook a fish seize - hook by a pull on the line; strike a fish grab, take hold of, catch - take hold of so as to seize or restrain or stop the motion of; Catch the ball!; Grab the elevator door!