Bluefin Trevally

The bluefin trevally, also known as the spotted or star trevally (Caranx melampygus), is a species of marine ray-finned fish from the jack family. They inhabit the waters of the Indian and Pacific Oceans, extending from the eastern coast of Africa to the western coast of Central America, including Japan in the north and Australia in the south. Diverse in their lifestyle, these fish can be found in bays, lagoons, near reefs, as well as at atolls and oceanic islands.

The maximum body length of the bluefin trevally reaches 117 cm, and weight – 43.5 kg. They are characterized by a slightly pointed snout, bright blue fin color, and the presence of numerous blue and black spots on the sides of the body.

These fish choose coastal waters, including bays, lagoons, and reef areas, as well as oceanic islands. Juveniles prefer shallow bays and enter estuaries. Bluefin trevally are predators, with fish being the main part of their diet, as well as crustaceans in small quantities. Their hunting behavior is diverse: from actively pursuing prey in the water to ambush methods and cooperation with larger predators.

The appearance description includes an oblong body, slightly compressed laterally, covered with small cycloid scales. The head and upper part of the body of adults have a copper-blue color, sprinkled with bluish spots and black dots. Spots and dots appear at a standard body length from 16 to 22 cm and increase with fish growth. The lower part of the body and belly are colored silvery-white. The second dorsal, anal, and caudal fins have bright blue coloration, the pelvic fins are whitish, and the pectoral fins are pale yellow. There is no spot on the gill covers. In juveniles and small immature individuals, the head and body are colored silvery-gray, and the fins are dark gray, except for yellow pectoral fins.