蓝鳍鲹，又称黑尻鲹、黄臂鲹，俗名为甘仔鱼，为辐鳍鱼纲鲈形目鲈亚目鲹科的其中一个种。

本鱼分布于印度太平洋区，包括东非、毛里求斯、塞舌尔群岛、马尔代夫、斯里兰卡、马达加斯加、印度、马来西亚、泰国、孟加拉湾、安达曼海、日本、**、中国沿海、菲律宾、缅甸、印尼、马里亚纳群岛、马绍尔群岛、密克罗尼西亚、新几内亚、澳洲、新喀里多尼亚、法属波里尼西亚、夏威夷群岛、费尼克斯群岛、所罗门群岛、斐济群岛、瓦努阿图、东加、萨摩亚群岛、加拉巴哥群岛、下加利福尼亚半岛、厄瓜多尔、巴拿马等海域。

The bluefin trevally, Caranx melampygus (also known as the bluefin jack, bluefin kingfish, bluefinned crevalle, blue ulua, omilu and spotted trevally), is a species of large, widely distributed marine fish classified in the jack family, Carangidae. The bluefin trevally is distributed throughout the tropical waters of the Indian and Pacific Oceans, ranging from Eastern Africa in the west to Central America in the east, including Japan in the north and Australia in the south. The species grows to a maximum known length of 117 cm and a weight of 43.5 kg, however is rare above 80 cm. Bluefin trevally are easily recognised by their electric blue fins, tapered snout and numerous blue and black spots on their sides. Juveniles lack these obvious colours, and must be identified by more detailed anatomical features such as fin ray and scute counts. The bluefin trevally inhabits both inshore environments such as bays, lagoons and shallow reefs, as well as deeper offshore reefs, atolls and bomboras. Juveniles prefer shallower, protected waters, even entering estuaries for short periods in some locations.