WordNet sense 1 (largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics):

bluefin, Thunnus thynnus, bluefin tuna

WordNet sense 2 (large elongated compressed food fish of the Atlantic waters of Europe):

saurel, Trachurus trachurus

WordNet sense 3 (a California food fish):

Spanish mackerel, jack mackerel, Trachurus symmetricus