Stocking of ‘Trojan’ male brook trout in Colorado helping restore native Colorado River cutthroat

Colorado Parks and Wildlife has seen positive results in restoring native Colorado River cutthroat trout in Colorado through the introduction of Trojan male brook trout.
Also known as YY brook trout, Trojan males have two Y chromosomes, unlike the wild males that have one X and one Y chromosome. When introduced into wild fish populations of the same species, Trojan males only produce male offspring when they spawn with wild fish.

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