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Lahontan cutthroat trout
(詳細はsubspecies of cutthroat trout, and the state fish of Nevada. It is one of three subspecies of cutthroat trout that are listed as federally threatened.〔(【引用サイトリンク】publisher=U. S. Fish and Wildlife Service, Nevada Office )〕
==Natural history==
The Lahontan cutthroat is native to the drainages of the Truckee River, Humboldt River, Carson River, Walker River, Quinn River and several smaller rivers in the Great Basin of North America. These were tributaries of ancient Lake Lahontan during the ice ages until the lake shrank to remnants such as Pyramid Lake and Walker Lake about 7,000 years ago, although Lake Tahoe—from which the Truckee flows to Pyramid Lake—is still a large mountain lake.
Lahontan cutthroats evolved into a large (up to 1 m or 39 in) and moderately long-lived predator of chub, suckers, and other fish as long as 30 or . The trout was able to remain a predator in the larger remnant lakes where prey fish continued to flourish, but upstream populations were forced to adapt to eating smaller fish and insects. Some experts consider ''O. c. henshawi'' in the upper Humboldt River and tributaries to be a separate subspecies, ''O. clarkii humboldtensis'' or the Humboldt cutthroat trout, adapted to living in small streams rather than large lakes.
The record size cutthroat trout of any subspecies was a Lahontan caught in Pyramid Lake weighing , although anecdotal and photographic evidence exists of even larger fish from this lake.
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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