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Pigo
The pigo〔Kottelat, M. and J. Freyhof, 2007. Handbook of European freshwater fishes. Publications Kottelat, Cornol, Switzerland. 646 p. 〕 (''Rutilus pigus'') is a species of freshwater fish in the roach genus ''Rutilus'' of the Cyprinidae family.〔World Conservation Monitoring Centre 1996. (''Rutilus pigus'' ). (2006 IUCN Red List of Threatened Species. ) Downloaded on 19 July 2007.
〕 The fish is native to northern Italy and Switzerland. It inhabits subalpine lakes of the northern Adriatic basin from the Livenza to the Po drainage, including Lakes Maggiore, Lugano, and Como.
''Rutilus pigus'' has been termed the Danube roach. The Danube drainage is not inhabited by ''R. pigus'' in the strict sense above, however. That region is inhabited by the closely related ''Rutilus virgo'' ("cactus roach"), which until recently was considered to be the same species as ''R. pigus'', or its subspecies ''R. p. virgo''. ''R. virgo'' is widespread from the Iron Gate upstream.〔
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==References==
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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