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Both lakes held small greenback cutthroat trout from the early days of the Wild West, but in the mid-1880s reports circulated of much larger trout, up to 10 pounds (5 kg) in weight, with bright yellow fins. Recent research has speculated that the yellowfin cutthroat may have been native to the entire Arkansas River basin, not just Twin Lakes. [2]
The cutthroat trout (Oncorhynchus sp.) is a group of four fish species [4][5] of the family Salmonidae native to cold-water tributaries of the Pacific Ocean, Rocky Mountains, and Great Basin in North America. These four species are the Coastal (O. clarkii), Westslope (O. lewisi), Lahontan (O. henshawi), and the Rocky Mountain (O. virginalis).
The Yellowfin cutthroat shared its habitat with the greenback cutthroat trout, but was distinguished by its morphology and life history. [3] [4] [5] After the introduction of rainbow trout into Twin Lakes, the Yellowfin cutthroat trout went extinct.
Biologists are on a quest to find a “zombie fish” in Colorado. The Yellowfin cutthroat trout was a fish that once grew up to 12 pounds and fed on other fish. But more than 120 years ago, it ...
However, the most serious current threats to the subspecies are interbreeding with introduced rainbow trout (resulting in cutbows) in the Greater Yellowstone ecosystem, the presence of lake trout in Yellowstone and Heart lakes in Yellowstone National Park which prey upon cutthroat trout to 15 inches in length, and several outbreaks of whirling ...
Westslope cutthroat are common in both headwaters lake and stream environments. They feed mainly on insects and zooplankton. The average length of the fish is about 8-12 inches (30 cm) and rarely exceeds 18 inches (46 cm). The skin has small dark freckle-like spots clustered towards the tail, and is mostly orange-hued.
The greenback cutthroat trout (Oncorhynchus clarkii stomias) is the easternmost subspecies of cutthroat trout. The greenback cutthroat, once widespread in the Arkansas and South Platte River drainages of Eastern Colorado and Southeast Wyoming, today occupies less than 1% of its historical range. It is currently listed as threatened under the ...
List of fishes of Yellowstone National Park
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