珍鲹（学名：Caranx ignobilis，又名白面弄鱼、浪人鲹、牛港鲹、牛港瓜仔、牛公瓜仔、流氓瓜仔，为辐鳍鱼纲鲈形目鲈亚目鲹科鲹属的鱼类，分布于印度洋、红海、东至日本、澳大利亚以及中国南海、**等海域及半咸水域，为热带鱼类，栖息深度10-188公尺，本鱼头部与身体背面暗金色，腹面银色，鳍通常灰色到黑色，胸部基部没有鳞片，胸鳍镰刀状，臀鳍有2根分离的棘，背鳍硬棘9枚、背鳍软条17-22枚、臀鳍硬棘3枚、臀鳍软条15-17枚，体长可达170公分，成鱼栖息在水质清澈的潟湖及临海礁石区，稚鱼出现在河口区，以甲壳类及鱼类为食，可做为食用鱼、观赏鱼、养殖鱼及游钓鱼，具有雪卡鱼毒的纪录。

The giant trevally, Caranx ignobilis (also known as the giant kingfish, lowly trevally, barrier trevally, ulua, or GT), is a species of large marine fish classified in the jack family, Carangidae. The giant trevally is distributed throughout the tropical waters of the Indo-Pacific region, with a range stretching from South Africa in the west to Hawaii in the east, including Japan in the north and Australia in the south. It is distinguished by its steep head profile, strong tail scutes, and a variety of other more detailed anatomical features. It is normally a silvery colour with occasional dark spots, but males may be black once they mature. It is the largest fish in the genus Caranx, growing to a maximum known size of 170 cm and a weight of 80 kg. The giant trevally inhabits a wide range of marine environments, from estuaries, shallow bays and lagoons as a juvenile to deeper reefs, offshore atolls and large embayments as an adult. Juveniles of the species are known to live in waters of very low salinity such as coastal lakes and upper reaches of rivers, and tend to prefer turbid waters.