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Southern black bream : ウィキペディア英語版
Southern black bream

The southern black bream (''Acanthopagrus butcheri'') (also known as the black bream, southern bream and blue-nosed bream) is a species of marine and freshwater fish of the porgy family, Sparidae. It is a deep-bodied fish, occasionally confused with other similar species that occur within its range, but is generally distinguished from these species by a lack of yellow ventral and anal fins. Southern black bream are endemic to Australia, inhabiting the southern coast from Shark Bay in Western Australia to Mallacoota, Victoria, as well as Tasmania.
The species is primarily an inhabitant of estuaries and coastal lakes, rarely entering the ocean, as it cannot complete its life cycle in a fully marine environment. During the breeding season, the species is known to penetrate into the upper reaches of rivers to spawn, causing an influx of juveniles in the estuaries a few months later. Southern black bream are opportunistic predators, consuming a wide range of crustaceans, molluscs, polychaetes and fish.
The southern black bream is a major target for both commercial and amateur fishermen due to its high quality flesh, with over 300 tonnes of fish taken each year by commercial fisheries. Anglers also seek out the fish for its sporting qualities, with the development of lure fishing for bream adding to this attraction. Aquaculture techniques for the species are being developed, with a slow growth rate the major hurdle to large scale food production.
==Taxonomy and naming==
The southern black bream is one of eleven species in the genus ''Acanthopagrus'', part of the porgy family Sparidae. The Sparidae are perciform fish in the suborder Percoidei. The southern black bream was at first confused with its nearly identical east coast relative, the surf bream (''Acanthopagrus australis''), with specimens initially grouped under the name ''Mylio australis'' by Rudall, Hale and Sheriden. In a 1949 review of the Australian "silver breams," Ian Munro found that ''M. australis'' was in fact two separate species, creating the new species name of ''Mylio butcheri'' to accommodate the southern black bream. Munro based this classification on a number of new specimens, one of which was from the Gippsland Lakes, Victoria, which he designated to be the holotype. ''Mylio butcheri'' was later changed to ''Acanthopagrus butcheri'' when the true genus of the species was identified.
''Acanthopagrus butcheri'' has a number of common names, many of which are applied to a number of related fish species, both in Australia and worldwide. The species is commonly referred to in publications as the "southern black bream" to avoid confusion with the black sea bream and other closely related species loosely given the name "black bream." The species is known regionally by the names "black bream," "Perth bream," "Gippsland bream" and the "blue-nose bream." The latter name is given to mature fish over 1 kg in weight, as at this point their snouts begin to develop a bluish tinge.〔 The Department of the Environment, Water, Heritage and the Arts of the Federal Government designated black bream as preferred name.〔 Black bream has also been designated the standard name by the CSIRO Division of Marine and Atmospheric Research in commercial fishing in Australia.

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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