You’ve heard of Trojan horses, but what about Trojan 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. Photo credit: Colorado Parks and Wildlife/R.Gonzales Far from a mythological tale, the brookies in question are the newest scientific weapon in Colorado officials’ toolbox to combat its invasive brook trout species. The goal?