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The relict darter (''Etheostoma chienense'') is a rare species of fish in the perch family, and is endemic to Kentucky, where it occurs only in the drainage of the Bayou du Chien.〔Warren, M. L., et al. (1994). (The relict darter, ''Etheostoma chienense'' (Percidae): status review of a Kentucky endemic. ) ''Trans. Ky. Acad. Sci.'' 55(1-2), p. 20-27.〕 It is a federally listed endangered species of the United States.〔USFWS. (Determination of endangered status for the Relict Darter and Bluemask (=Jewel) Darter. ) ''Federal Register'' December 27, 1993.〕 The Relict Darter is part of the ''Etheostoma squamiceps'' species complex and was formally described in 1992. It grows up to about 7.2 cm in length and is characterized by "lollipop-like" white knobs on the second dorsal fin of the male that develops during the breeding season.〔Burr, B. M. and M. L. Warren, Jr. (1996). (Threatened fishes of the world: ''Etheostoma chienense'' Page & Ceas, 1992 (Percidae). ) ''Environmental Biology of Fishes'' 47(2) 142.〕 The species is only found in a 35 km stretch of the Bayou du Chien, a tributary of the Mississippi River in Kentucky. .〔 It shelters in areas where the riverbank is undercut and water flows beneath a mat of roots. The substrate is sand and gravel covered in leaf litter. This type of habitat is not continuous on the river, leaving wide spaces between patches of appropriate habitat.〔 The Relict Darters diet is mainly insects. During reproduction, eggs are stuck to the undersides of sticks and rocks. Only one spawning area has been observed.〔 This species is limited to one small river system which has been altered and no longer has much habitat or appropriate spawning areas. Agriculture and the channelization of the river have affected these changes.〔 ==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「Relict darter」の詳細全文を読む スポンサード リンク
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