In a clear, cold pool waits a patient predator, a monster of the river. He is voracious, ready to devour any prey which crosses his path, even if he has to fight for it. Many Alberta anglers can attest to his grit and have fond memories of wrestling with this feisty character. At the sight of his sleek, silvery-olive back and his orange speckled sides, they know this fish will not come quietly. He is the mighty bull trout.
LINK (via: University of Calgary)