The yellowfin cutthroat trout (Oncorhynchus clarkii macdonaldi) is an extinct subspecies or variety of the cutthroat trout, a North American freshwater fish.

In July 1889, Professor David Starr 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".

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https://en.m.wikipedia.org/wiki/Yellowfin_cutthroat_trout