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Duskyshoulder trevally
The duskyshoulder trevally or epaulet trevally, ''Carangoides humerosus'', is a species of small inshore marine fish in the jack family, Carangidae. It is distributed through the eastern Indian and western Pacific Oceans, ranging from eastern India to northern Australia and Taiwan. It is relatively small by carangid standards, reaching only 27 cm maximum length, and can be distinguished by the large, black blotches on its shoulders. The duskyshoulder trevally is an inshore fish living in waters less than 50 m deep, over sandy substrates in bays and on the continental shelf. It is a predatory fish, taking demersal fishes, crustaceans, and cephalopods, with nothing known of its reproductive habits. It is of little value to fisheries, often taken as bycatch in prawn trawling operations.
==Taxonomy and naming==
The duskyshoulder 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, of the order Perciformes, in the suborder Percoidei.
The species was first scientifically described by the Australian ichthyologist Alan Riverstone McCulloch in 1915 based on the holotype specimen taken from Bustard Head in Queensland, Australia. He named the species ''Caranx humerosus'', with the specific epithet literally meaning "having shoulders" in reference to the species prominent dark shoulder colouring. The species was later transferred to the genus ''Carangoides'', where it remains.〔 The species has not been redescribed under another name, which is rare amongst the Carangidae. The common name 'duskyshoulder trevally' refers to the prominent shoulder markers, as does the name 'epaulet trevally'.
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