cusk also known as torsk or tusk, a fish of the cod family which has a range stretching right across the northerly waters of the N. Atlantic. Its habits are unlike those of its brethren; it does not mass in shoals but tends to a solitary and sedentary existence, growing slowly in the cold Arctic waters (maximum length 110 cm/44"). It has only one dorsal fin, and just one barbel.
There is some commercial fishing for the cusk, which may be marketed either fresh or salted. Its flesh contains a moderate amount of oil and is well suited to grilling or baking.
