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Island trevally
The island trevally, island jack, thicklip trevally, or false bluefin trevally, ''Carangoides orthogrammus'', is a widespread species of offshore marine fish classified in the jack family Carangidae. The island trevally is common through the tropical regions of the Indian and Pacific Oceans, ranging from Mozambique and the Seychelles in the west to Hawaii and the Revillagigedo Islands in the central and eastern Pacific. The species is almost completely absent from the continental shelves, instead inhabiting offshore islands, where it is found in lagoons and on reef systems. It is a moderately large fish, growing to a maximum recorded length of 75 cm and 6.6 kg in weight, and is distinguishable by its angular snout and yellow spots, as well as more detailed anatomical features. The island trevally often moves in small schools, preying on a variety of small fishes and crustaceans. It is of moderate importance to fisheries throughout its range, often taken by trawls, hook-and-line, and various inshore netting methods, and is sold fresh or salted at market.
==Taxonomy and naming==
The island trevally is classified within the genus ''Carangoides'', a group of fish commonly called jacks and trevallies. ''Carangoides'' falls into the jack and horse mackerel family Carangidae, order Perciformes, suborder Percoidei.
The species was first scientifically described by the American ichthyologists Jordan and Gilbert in 1881 based on a specimen taken from the Revillagigedo Islands, which was designated to be the holotype. They named this new species ''Caranx orthogrammus'', placing the species in a closely related genus of jacks, but this was later changed to ''Carangoides'' after further revision of the family had occurred. The species was independently redescribed a number of times, with the fish placed in subspecies status twice. John Treadwell Nichols considered his ''C. ferdau jordani'' to be separate from ''C. orthogrammus'', or possibly a subspecies of the blue trevally, ''C. ferdau'', and was later treansferred to ''C. jordani''. It was also considered a subspecies or a synonym of the bludger, ''C. gymnostethoides'', and was also renamed as ''C. nitidus''. The fish is now considered a separate species, with the subspecies names and the later names rendered invalid under the ICZN naming rules. The species is commonly known as island trevally in reference to its preferred offshore habitat, with the names thicklip trevally and false bluefin trevally also used as descriptive names. The specific epithet means "straight lined" in Greek.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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