wahoo, (Acanthocybium solanderi), swift-moving, powerful, predacious food and game fish of the family Scombridae (order Perciformes) found worldwide, especially in the tropics. The wahoo is a slim, streamlined fish with sharp-toothed, beaklike jaws and a tapered body ending in a slender tail base and a crescent-shaped tail. Gray-blue above and paler below, it is marked with a series of vertical bars and, like the related tunas, has a row of small finlets behind the dorsal and anal fins. At its largest, the wahoo attains a length of 1.8 m (6 feet) and weight of 55 kg (120 pounds) or more.