Biologists have discovered that a non-native predator fish has made its way through Glen Canyon Dam to the lower Colorado River, which could potentially unravel years of restoration work and upend the Grand Canyon aquatic ecosystem.
For National Park Service fisheries biologist Jeff Arnold, it was a moment he'd been dreading.
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. Under the Endangered Species Act, government agencies are required to operate in ways that will not "jeopardize the continued existence" of listed animals. That includes infrastructure.
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