The fish out of the ponds are as clean as they come. Hatchery raised. I would almost consider betting they are cleaner than some of the frozen pollock found in the supermarket boxes. Just about every river in CO has some sort of metal in it. After all, the mineral belt cuts across the state.
After sampling and dissecting so many fish, I have a hard time eating anything from warm water. The parasites; tapeworms, flukes and the associated cysts. These fish also predominately live in waters that are fed by hardened earth run off or storm sewers; carrying human waste, pesticides, herbicides, fertilizers...I better stop; getting the heebie-jeebies. As a result, I'd personally eat 10 Ridgway trout long before one Front Range bass. LOL