NPS fisheries biologists have discovered that smallmouth bass, a non-native predator fish, has made its way through Glen Canyon dam and appears to have spawned in the lower Colorado River, where it can prey on humpback chub, an ancient native fish they have been working to reestablish.
As reservoir levels drop, non-native fish that live in warm surface waters in Lake Powell are edging closer to the dam and its penstocks — submerged steel tubes that carry water to turbines, where it generates hydroelectric power and is released on the other side.
LINK (via AP News)
