Another collaborative effort between Pat Clayton and John Arnold has resulted in a short tribute to native Bull Trout. An officially threatened species, bull trout are under constant assault from industry, resource extraction, mainstream river dewatering, poaching, invasive species, dams and climate change. Bull Trout require not only a healthy, but intact, river system to survive. They exist today in less than 50 percent of their original habitat. Bull Trout are a critical indicator species and signify a healthy eco-system.