Haddock vs. Halibut — What's the Difference?

The haddock (Melanogrammus aeglefinus) is a saltwater ray-finned fish from the family Gadidae, the true cods. It is the only species in the monotypic genus Melanogrammus.

Halibut is the common name for three flatfish in the genera Hippoglossus and Reinhardtius from the family of right-eye flounders and, in some regions, and less commonly, other species of large flatfish. The word is derived from haly (holy) and butte (flat fish), for its popularity on Catholic holy days.

A silvery-grey bottom-dwelling fish of North Atlantic coastal waters, related to the cod. It is popular as a food fish and is of great commercial value.

Any of several large edible flatfishes of the genus Hippoglossus and related genera, of northern Atlantic or Pacific waters.

A food fish (Melanogrammus aeglefinus) of northern Atlantic waters, closely related to and resembling the cod, but having a dark spot above each pectoral fin.

A large flatfish of the genus Hippoglossus, which sometimes leaves the ocean floor and swims vertically.

A marine fish, Melanogrammus aeglefinus, of the North Atlantic, important as a food fish.

A large, northern, marine flatfish (Hippoglossus vulgaris), of the family Pleuronectidæ. It often grows very large, weighing more than three hundred pounds. It is an important food fish.

A marine food fish (Melanogrammus æglefinus), allied to the cod, inhabiting the northern coasts of Europe and America. It has a dark lateral line and a black spot on each side of the body, just back of the gills. Galled also haddie, and dickie.

Lean flesh of very large flatfish of Atlantic or Pacific

Lean white flesh of fish similar to but smaller than cod; usually baked or poached or as fillets sauteed or fried

Marine food fish of the northern Atlantic or northern Pacific; the largest flatfish and one of the largest teleost fishes

Important food fish on both sides of the Atlantic; related to cod but usually smaller