Garfish

The garfish is a long and slender fish with a laterally compressed body, and grows to about 50 to 75 cm (20 to 30 in) in length. The jaws are elongated and armed with sharp teeth. The pectoral, dorsal, and anal fins are situated well back on the body and the latter two are similar in appearance. Positioning the fins so far back gives greater flexibility to the body. The lateral line is set low on the flanks. The colour of the body is bluish green with a silvery grey belly and the bones are green.

Garfish are sometimes caught as bycatch, mainly in fixed nets along the coast in shallow waters. If caught with rod and line, they tend to leap out of the water when hooked. Garfish are eaten boiled, fried, baked, grilled, or smoked. They have unusual green bones (due to the presence of biliverdin) which discourages many people from eating them, but the green colour is harmless. They are very popular as a food in Denmark.

Garfish are pelagic fish which live close to the water surface. They eat small fish and have a migratory pattern similar to that of the mackerel, arriving a short time before the latter to spawn. Their association with mackerel has led to some older common names such as "mackerel guide" and "mackerel guardian".

They move into shallow waters in April and May and spawn in areas with eelgrass in May and June. In the autumn, they return to the open sea, including the Atlantic west of Ireland and Great Britain. Garfish are oviparous and the eggs are often found attached to objects in the water by tendrils on the egg's surface. Spawning occurs in May and June among seagrass beds with the long sticky tendrils on the chorion adhering to the blades of the sea grasses. The juveniles remain in shallower waters until such time as they attain sexual maturity.