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Pseudomugil signifer
''Pseudomugil signifer'', the Pacific blue-eye, is a species of fish in the family Pseudomugilidae. It is a common fish of rivers and estuaries of eastern Australia, where it forms loose schools of hundreds to thousands of individuals. It eats water-borne insects, as well as flying insects that land on the water surface, foraging for them by sight. A small silvery fish averaging around in total length, it is recognisable by its blue eye ring and two dorsal fins. It adapts readily to captivity.
==Taxonomy==
Austrian naturalist Rudolf Kner described the species in 1866, from a specimen collected in Sydney and taken to Vienna by the ''SMS Novara'' in 1858.〔 Albert Günther described ''Atherina signata'' from collections in Cape York in 1867. William Sharp Macleay named a "curious little fish", collected from the Bremer River, a tributary of the Brisbane River, by one Mr Jameson of Ipswich, ''Atherinosoma jamesonii'' in 1884, which was later classified as the same species by James Douglas Ogilby in 1908. Variable across its range, the Pacific blue-eye is considered to be a single species, though has been split by some into northern ''signata'' and southern ''signifer'', with the former found from Ross River northwards and the southern from the Calliope River south. The division occurs at a biogeographic dividing point known as the Burdekin Gap.〔 Gilbert Whitley examined material from the Low Isles off Cairns and split the taxon into ''P. signifer'' and ''P. signata'' in 1935. In 1979, Hadfield and colleagues analysed the variations described and felt both species were more highly variable than different to each other, and that no characteristics enabled people to distinguish either species. Hence they recommended combining the species again. However, a 2004 molecular study showed the two populations were genetically distinct and suggested that they may be once again reclassified as species.
Within the northern population, five subclades have been identified: one from Ross River and Herbert River, a second from Johnstone, Barron and Tully Rivers, a third from Mulgrave/Russell River and Trinity Inlet, a fourth from Daintree and Mossman Rivers and a fifth from Low Isles and Cape Melville. Four subclades have been identified in the southern population: the first from the Don, Calliope, Pioneer and Kolan Rivers, the second from Burnett and Mary Rivers, the third from Pine River and the fourth from Clarence River southwards.〔
Alternate names include southern blue-eye and northern blue-eye. Species from the northern and southern extremes of the range do not appear to interbreed in captivity, suggesting that there may be two separate species within the current concept of the species.
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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