The Wahoo (Acanthocybium solandri) is a dark blue fish found worldwide in tropical and subtropical seas. Some say that the name "Wahoo" derives from the exclamation of some fishermen, "Wahoo!" who have hooked into the extremely fast running fish. In Hawaii, the fish is known as Ono, after the Native word for "delicious". Hispanic areas of the Caribbean and Central America call it Peto.

The body is elongated and covered with small, scarcely visible scales; the back is an iridescent blue-green, while the sides are silvery, with a pattern of vertical blue bars. 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 (8 ft) in length, and weighing up to 83 kg (180 lb). Growth can be rapid. One specimen tagged at 5 kg (11 lb) grew to 15 kg (33 lb) in one year. Wahoo can swim up to 75 km/h (47 mph).