A large-scale fish mortality event has prompted officials to exercise extreme caution when it comes to swimming in Canyon ...

LAS VEGAS — Researchers in Grand Canyon National Park have discovered a prehistoric-looking sucker fish ... believe the fish might have traveled upstream some 50 miles from Lake Mead.

The razorback sucker is a large, warm-water fish native to the Colorado River basin ... streams inhabited by the sucker and contaminate groundwater. We sued over Glen Canyon Dam operations to force ...

Recent samples from Canyon Lake confirmed an increased abundance of golden algae, while no presence has been detected in Apache Lake. Fish kills in Saguaro and Canyon lakes are expected to ...