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.

haddock, (Melanogrammus aeglefinus), valuable North Atlantic food fish of the cod family, Gadidae, that is often smoked and sold as “finnan haddie.” The haddock is a bottom dweller and a carnivore, feeding on invertebrates and some fishes. It resembles the cod and, like its relative, has a chin barbel and two anal and three dorsal fins.

Melanogrammus aeglefinus (Haddock) is a species of ray-finned fishes in the family cods. They are listed as vulnerable by IUCN. Individuals can grow to 112 cm. They have sexual reproduction.