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Pacific jack mackerel
The Pacific jack mackerel (''Trachurus symmetricus'') (also known as the Californian jack mackerel or simply jack mackerel), is an abundant species of pelagic marine fish in the jack family, Carangidae. The species is distributed along the western coast of North America, ranging from Alaska in the north to the Gulf of California in the south, inhabiting both offshore and inshore environments. The Pacific jack mackerel is a moderately large fish, growing to a maximum recorded length of 81 cm, although commonly seen below 55 cm. It is very similar in appearance to other members of its genus, ''Trachurus'', especially ''Trachurus murphyi'', which was once thought to be a subspecies of ''T. symmetricus'', and inhabits waters further south. Pacific jack mackerel travel in large schools, ranging up to 600 miles offshore and to depths of 400 m, generally moving through the upper part of the water column.
==Distribution and habitat==
The Pacific jack mackerel is distributed through the eastern Pacific Ocean from Alaska in the north, south to the western North American seaboard to the Baja California peninsula in the Gulf of California.〔 It has been reported as far south as the Galápagos Islands, but at these latitudes it would be sympatric with ''T. murphyi'', possibly resulting in confusion of the two species. Pacific jack mackerel occur in both pelagic and inshore environments, often venturing up to 600 miles offshore and to known depths of 400 m. In more coastal environments, they are known to inhabit bays and very shallow waters.〔
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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