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Yellowfin cutthroat trout: Wikis

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Yellowfin cutthroat trout
Conservation status

Presumed Extinct (TNC)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Salmoniformes
Family: Salmonidae
Genus: Oncorhynchus
Species: O. clarki
Subspecies: O. c. macdonaldi
Trinomial name
Oncorhynchus clarki macdonaldi
Jordan & Fisher, 1891

The yellowfin cutthroat trout (Oncorhynchus clarki macdonald), a subspecies of the cutthroat trout, was officially identified in 1891 and named after the US Fish Commissioner, MacDonald. The yellowfin cutthroat is extinct.

Natural history

At the end of the last ice-age boulders and clay moraine blocked off a tributary of the headwaters of the Arkansas River in what is now the state of Colorado. The two lakes which formed were named the "Twin Lakes" by the area's settlers. 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.

Discovery and naming

In July 1889, Professor D. S. Jordan and G. R. Fisher visited Twin Lakes and published their discoveries in the 1891 Bulletin of the United States Fish Commission. They found both the greenback and what they proclaimed to be a new species the "yellowfin cutthroat". In his report Jordan took credit for the name and described the fish as follows:

Color, silvery olive; a broad lemon yellow shade along the sides, lower fins bright golden yellow in life, no red anywhere except the deep red dash on each side of the throat.

Jordan's specimens have recently been re-examined by American biologist Robert Behnke, who commented, 'I have no doubt that Jordan was correct; the yellowfin trout and the greenback trout from Twin Lakes were two distinct groups of cutthroat trout'.

Extinction

Until about 1903, greenback and yellowfin cutthroats survived together in Twin Lakes, the populations remaining isolated as both breeders and feeders. The end for the yellowfin cutthroat came soon after the introduction of the rainbow trout to Twin Lakes. The greenback population interbred with the rainbows, resulting in cutbows, but the yellowfin disappeared completely. The yellowfin is now extinct.

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