blackfish Definition

any of numerous dark-colored fishes: such as

tautog

a small bony fish (Dallia pectoralis of the family Umbridae) of Alaska and Siberia that is used for food and is noted for its resistance to cold

either of two dark gray to black, medium-sized toothed whales (Globicephala melas and G. macrorhynchus) of temperate to tropical waters that have a large rounded forehead and short snout and typically feed on squid and small fish —called also blackfish

an edible fish (Tautoga onitis) of the wrasse family found along the Atlantic coast of the U.S. and adjacent Canada —called also blackfish