Wahoo

Appearance

Its body is elongated and covered with small, scarcely visible scales; the back is an iridescent blue, while the sides are silvery, with a pattern of irregular vertical blue bars and have razor sharp teeth. These colors fade rapidly at death. The mouth is large, and both the upper and lower jaws have a somewhat sharper appearance than those of king or Spanish mackerel.

Specimens have been recorded at up to 2.5 m in length, and weighing up to 83 kg. Growth can be rapid. Wahoo can swim up to 60 mph. They are some of the fastest fish in the sea.

The wahoo may be distinguished from the related Atlantic king mackerel and from the Indo-Pacific narrow-barred Spanish mackerel by a fold of skin which covers the mandible when its mouth is closed. In contrast, the mandible of the king mackerel is always visible as is also the case for the smaller Spanish mackerel and Cero mackerel. The teeth of the wahoo are similar to those of king mackerel, but shorter and more closely set together.

The barracuda is sometimes confused with mackerel and wahoo, but is easy to distinguish from the latter two species. Barracuda have prominent scales, larger, dagger-like teeth, and lack the caudal keels and blade-like tail characteristic of the scombrids.

Behavior

Wahoo tend to be solitary or occur in loose-knit groups of two or three fish. Where conditions are suitable, they can be found in schools as large as 100 or more. Their diet is made up of other fish and squid.

Most wahoo taken have a trematode parasite living in their stomachs, the giant stomach worm ", which does not appear to harm the fish.