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Prickly sculpin
''Cottus asper'' is a species of fish in the sculpin family known by the common name prickly sculpin. It is native to the river drainages of the Pacific Slope of North America from Seward, Alaska south to the Ventura River of Southern California. It extends east of the Continental Divide in the Peace River of British Columbia. It has also been introduced to several reservoirs in Southern California.〔Fuller, P. and M. Neilson. 2013. (''Cottus asper''. ) USGS Nonindigenous Aquatic Species Database, Gainesville, FL.〕
==Description==
This fish can reach about 30 centimeters in length,〔 but it is usually smaller, often around 7 centimeters.〔Froese, R. (''Cottus asper''. ) In: Froese, R. and D. Pauly. Editors. 2011. FishBase. World Wide Web electronic publication.〕 It is mature at 2 to 4 years of age,〔NatureServe. 2013. (''Cottus asper''. ) NatureServe Explorer: An Online Encyclopedia of Life (application ).〕 and its maximum lifespan is around 7 years.〔 It is brown, gray, or olive green on its upper parts and white or yellowish ventrally. There are dark spots or bars on the back and dark bars on most of the fins.〔 The breeding male is darker in color than the female and nonbreeding male.〔Rickard, N. A. (1980). (Life history and population characteristics of the prickly sculpin (''Cottus asper'' Richardson) in Lake Washington. (Thesis). ) University of Washington.〕 Both sexes develop an orange coloration along the edge of the first dorsal fin during breeding. The pectoral fins are large and fan-shaped. The body of the fish is prickly; inland-dwelling fish tend to be more prickly than those at the coast.〔
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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