Trojan Brookies on Game Creek.

The Wyoming Game and Fish has released 3,600 "Trojan" male brook trout in Game Creed, a tributary of the Snake River, in an effort to conserve native cutthroat trout.

Trojan brookies have two Y-chromosomes and can only produce male offspring.

Brook trout, which many Wyomingites assume are a native fish, are not to the Western United States.  For the most part the introduced fish has no negative impact on the waterways in which the are not only in, but are abundant in, but there are exceptions, such as apparently this drainage.

Both fish are members of the Salmonidae family of fish, of which Salmon are prominent members, but cutthroat trout are part of the genus Oncorhynchus, which includes twelve species including Pacific Salmon.  Brook trout, however are chars.