Overview
Haddock (Melanogrammus aeglefinus) is a marine fish in the cod family (Gadidae) found primarily in the North Atlantic. It is a demersal species that lives and feeds close to the seabed on continental shelves and banks. Haddock is an important target for commercial and recreational fisheries and is widely eaten for its mild, white flesh.
Identification and appearance
Haddock is recognizable by a streamlined body typical of gadids and a prominent dark mark along the flank. Key identification points include:
- a distinct dark lateral streak or blotch along the side of the body;
- a darker patch above the pectoral fin often noted in field guides;
- white, flaky flesh when cooked and a relatively slender profile compared with some related species.
Distribution and habitat
Haddock occurs across the North Atlantic on both European and North American continental shelves. It prefers cool to cold temperate waters and is found from relatively shallow banks to deeper shelf areas. Local abundance varies by region and season according to water temperature, bottom type and food availability.
Diet and behaviour
Haddock feeds mainly on benthic and demersal prey such as small crustaceans, mollusks, worms and small fishes. It forages along the seabed and may form loose shoals, especially during migrations related to feeding or spawning.
Life cycle and reproduction
Haddock spawn seasonally in many parts of their range. Spawning produces free-swimming larvae that develop in the plankton before settling to the bottom as juveniles. Individuals generally take a few years to reach sexual maturity and growth and recruitment are influenced by environmental conditions and fishing pressure.
Fisheries and conservation
Haddock supports commercial fisheries for fresh, frozen, salted and smoked products. Management typically involves stock assessments, quotas, gear regulations and area closures to reduce overfishing. Some regional stocks have experienced declines in the past and management aims to balance harvest with long-term sustainability; consumers often consult sustainability guides when choosing seafood.
Culinary uses and nutrition
Haddock is prized for frying, baking, poaching and smoking. Traditional preparations include fish and chips and smoked varieties such as Finnan haddie and regional smoked products. Nutritionally, haddock is a lean source of protein and provides vitamins and minerals common to white fish; it contains some omega-3 fatty acids but generally less than oily species.
Similar species
Haddock is closely related to cod and pollock. It is commonly distinguished from these relatives by its lateral marking and particular body proportions; field guides and identification keys describe these differences in more detail.
For more information and species resources, see Haddock species information.