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Squawfish or pikeminnows are cyprinid fish of the genus ''Ptychocheilus'' consisting of four species native to western North America. Voracious predators, they are considered an "undesirable" species in many waters. This is largely due to the species' perceived tendency to prey upon small trout and salmon. First known in western science by the common name Columbia River Dace, the four species all became lumped under the offensive name "squawfish." In 1999, the American Fisheries Society adopted "pikeminnow" as the name it recommends, because Native Americans considered "squawfish" offensive.〔Nelson, J.S., E.J. Crossman, H. Espinosa-Pérez, L.T. Findley, C.R. Gilbert, R.N. Lea, and J.D. Williams. 2004. Common and scientific names of fishes from the United States, Canada, and Mexico. American Fisheries Society, Special Publication 29, Bethesda, Maryland. 386 p.〕 The Colorado pikeminnow, ''P. lucius'', is the largest member of the genus, averaging 4 to 9 pounds (2 to 4 kg) in adult fish with occasional specimens up to 25 pounds (11 kg). There are historical and anecdotal reports of Colorado pikeminnows nearing 6 feet (1.8 m) in length and 80 pounds (36 kg) in weight. The species is near extinction in its native Colorado River basin habitat, due to extensive habitat destruction. == Species == * ''Ptychocheilus grandis'' (Ayres, 1854) (Sacramento pikeminnow) * ''Ptychocheilus lucius'' Girard, 1856 (Colorado pikeminnow) * ''Ptychocheilus oregonensis'' (J. Richardson, 1836) (Northern pikeminnow) * ''Ptychocheilus umpquae'' Snyder, 1908 (Umpqua pikeminnow) 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「Ptychocheilus」の詳細全文を読む スポンサード リンク
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