The razorback sucker is a large, warm-water fish native to the Colorado River basin ... In 2009 we requested that Nevada add contaminated areas around Lake Mead — where a small number of razorback ...

recreational impacts by visitors to Lake Mead, and alteration due to natural erosion and scouring. Relict leopard frogs face the additional threats of predation and competition by introduced species ...

Lake Mead was at 1,062 feet ... "Smallmouth bass are known to prey on native fish species in the Grand Canyon that are protected by the Endangered Species Act." Releasing cool water from the ...