trout

Bull trout are dwindling in Montana as their home waters warm and invasive fish devour them. Scooping up threatened fish and moving them higher up the mountain could backfire. Is the risk worth it?

Scotland has some of the best trout fishing in the world. Now the North American signal crayfish is taking over waterways, threatening to wipe out native populations of insects those trout eat.

This summer, Michigan's aquaculture industry took a step forward. And that has touched off a debate over whether the Great Lakes are an appropriate place for fish farming.