|
The Modoc sucker (''Catostomus microps'') is a rare species of fish native to northern California and southern Oregon. It is listed as an endangered species in California and the United States, and it is listed as endangered by the IUCN. This sucker is mature when it reaches 3 to 4 inches long; the adult is usually no more than 7 inches long〔USFWS. (''Catostomus microps'' Five-year Review. ) August 2009.〕 but it rarely exceeds 13 inches.〔(''Catostomus microps''. ) The Nature Conservancy.〕 It has been observed to reach five years of age at the oldest.〔 This fish is limited to a few creeks in northern California and southern Oregon, where its historical range was located in the Ash Creek and Turner Creek drainages in the basin of the Pit River, as well as the Goose Lake basin, which was once connected to the Pit River. It can currently be found in ten streams in this region.〔 The stream habitat has substrates of sediment and cobble with large amounts of detritus in the water that the fish uses for cover. It also uses overhanging banks, large rocks, and vegetation for cover. Spawning occurs in substrates with a lot of gravel. The fish eats algae, small invertebrates, and detritus.〔 When the fish was placed on the US Endangered Species List it was threatened by the degradation of its habitat. Since then the habitat has been improved by the installation of livestock-excluding fences along waterways and other interventions. The creeks supporting the fish are relatively healthy today. The range of the fish is not currently being reduced. Introduced species of fish such as the largemouth bass are present but do not pose a serious threat to the sucker. In 2009 the United States Fish and Wildlife Service recommended the species be downlisted from endangered status to threatened status.〔 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Modoc sucker」の詳細全文を読む スポンサード リンク
|