Science Spotlight

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Recent accomplishments of CDFW's scientific community


CDFW Biologists Confirm Green Sturgeon Spawn in Yuba River

Underwater photo of a green sturgeon swimming along rocky river bottom.
CDFW biologists have been taking a new approach to looking at reproduction in one of the oldest fish species in existence. Green sturgeon, which are listed as threatened under the Federal Endangered Species Act, are in effect a living fossil, having swam in both the fresh and ocean waters from California to Alaska for more than 200 million years.

Science Spotlight: It’s Spawning Season for Salmon, Scientists Trying to Revive Extinct Central Valley Salmon Run

Man wearing long sleeved khaki shirt and pants with CDFW logo as well as yellow reflective vest and green safety hat while holding upside down fish. Scale made of PVC pipe and monitor in background.
Fresno County may seem an unlikely setting for salmon restoration and research, but some of the California Department of Fish and Wildlife’s (CDFW) most ambitious work with salmon anywhere is taking place in the heart of the parched Central Valley.

Sweetwater River Habitat Restoration

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California’s drought emergency was officially declared to be over last year, but its deleterious impact on fish habitat is still being felt in many parts of the state -- especially in arid parts of Southern California. In order to help offset these effects at one site in northern San Diego County, CDFW biologists and other staff recently toiled to create spawning beds for rainbow trout.

Creating Habitat in a Drawn-Down Lake

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More than a decade ago, Southern California freshwater anglers were disappointed to see a tried-and-true fishing spot dramatically affected by an emergency lake drawdown. Due to seismic concerns with the Perris Dam, California Department of Water Resources (DWR) officials deemed it necessary to reduce the water level at Lake Perris near Riverside by several thousands of acre-feet.