A rare fish that lives in the Santa Ana River has been fighting off extinction for decades. The Santa Ana sucker is a bottom-feeder, and it's at the center of a fight involving two cities, 10 water agencies and the U.S. Fish and Wildlife Service.

The battle might head to the U.S. Supreme Court to decide between designating a part of the river a critical habitat, but that could restrict water use for residents near the river. 

Heather Dyer, a fish biologist and water resources project manager for the San Bernardino Valley Municipal Water District, joined the show with more.

To listen to the full interview, click on the blue audio player above.