HADDOCK (Gadus aeglefinus), a fish distinguished from its relative, the cod, by the smaller mouth and the blackish lateral line. From Iceland it ranges southward on both sides of the Atlantic ; in the North sea it constitutes nearly half the total weight of fish taken in the trawl. It feeds mainly on molluscs and crustaceans. It grows to a length of 3 ft. but specimens of this size are exceptional.