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Oregon chub
The Oregon chub (''Oregonichthys crameri'') is a species of ray-finned fish in the Cyprinidae family.
It is endemic to Oregon in the United States. From 1993 to 2014 it was a federally listed threatened species.
This chub is native to the drainage of the Willamette River in Oregon. It was once distributed throughout the drainage in shallow water habitat, but changes in the hydrology of the region have eliminated much of this habitat and restricted the chub to several streams and rivers. Dams and channels were constructed and non-native species of fish were introduced to the area. The chub was listed as endangered in 1993 and downlisted to threatened in 2010.〔Bangs, B. L., P. D. Scheerer, R. L. Jacobsen, and S. E. Jacobs. 2010. (2010 Oregon Chub Investigations. ) Oregon Department of Fish and Wildlife. Fish Research Project EF-10, Annual Progress Report, Corvallis.〕
In early 2014, the U.S. Fish and Wildlife Service said that the small, silver-speckled minnow would become the first fish to be taken off the endangered species list when its numbers returned from fewer than 1,000 individuals to an estimated 160,000.〔(Oregon chub: Swimming against the current ) Corvallis Gazette-Times, 2014-02-04.〕〔(Drab Fish Makes Big Splash as First Removed from Endangered Species Act ) The Weather Channel, 2014-02-05.〕 It was delisted on February 17, 2015 with populations of more than 140,000 in 80 different locations.〔http://www.fws.gov/pacific/news/news.cfm?id=2144375359〕
==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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