Haddock is a very popular fish for food. It is sold fresh, smoked, frozen, dried, or canned. Fresh haddock has a fine white flesh and can be cooked in the same ways as cod. The freshness of a haddock fillet can be determined by how well it holds together, as a fresh one will be firm. Also, fillets should be translucent, while older fillets turn a chalky hue. It is as an excellent source of dietary protein and contains a good deal of vitamin B12, pyridoxine, and selenium, and a healthy balance of sodium and potassium, with very little fat.