The cobia (Rachycentron canadum) is a species of marine fish, the only representative of the genus Rachycentron and the family Rachycentridae. Attaining a maximum length of 2 m (78 in) and maximum weight of 68 kg (150 lb), the cobia has an elongated body and a broad, flattened head. The eyes are small and the lower jaw projects slightly past the upper. The body of the fish is smooth with small scales. It is dark brown in color, grading to white on the belly with two darker brown horizontal bands on the flanks. The stripes are more prominent during spawning, when they darken and the background color lightens. The cobia is normally solitary except for annual spawning aggregations, and sometimes it will congregate at reefs, wrecks, harbours, buoys, and other structural oases. It is pelagic, but it may enter estuaries and mangroves in search of prey. It is found in warm-temperate to tropical waters of the West and East Atlantic Ocean, throughout the Caribbean, and in the Indo-Pacific off India, Australia and Japan. It is eurythermal, tolerating a wide range of temperatures, from 1.6 to 32.2°C.