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Recent accomplishments of CDFW's scientific community


Surveying the Sacramento River and Delta

Surveying the Sacramento River and Delta

Since 1959 the California Department of Fish and Wildlife (CDFW) has used a combination of scientific techniques to better understand fish populations and the general health of Northern California waterways. Examples include tagging sturgeon, trawling the Delta for smelt, and counting salmon carcasses. CDFW uses data from these strategies and others to help influence operations of the State Water Project and Central Valley Project, ultimately helping decision makers determine water flows. link opens in new windowThis short video highlights these operations along the Sacramento River and into the Delta, including a smelt survey conducted by Environmental Scientist Felipe la Luz.

a man and a woman on the aft deck of small vessel on a river a woman and man prepare a fish-catching net




Recent Posts

  • CDFW Completes 2017 Waterfowl Breeding Population Survey Posted 3 days ago
    The California Department of Fish and Wildlife (CDFW) has completed its annual waterfowl breeding population survey. Mallards, gadwall and cinnamon teal comprised 54 percent of the ducks observed, down 30 percent from last year. The number of mallards decreased from ...
  • Survey Says: California Marine Anglers Help Scientists Collect Data Posted 2 weeks ago
    If you’re an avid marine sport angler, you have most likely seen the smiling faces and brown polo shirts of California Recreational Fisheries Survey (CRFS) samplers. Since its inception in 2004, CRFS has grown into one of the state’s ...
  • Salt Marsh Harvest Mouse Survey Posted last month
    Deep in the pickleweed in the San Francisco, San Pablo and Suisun Bays, the tiny salt marsh harvest mouse (Reithrodontomys raviventris) tries to avoid predators and compete with other species for prime habitat. Food and cover are abundant, but ...
  • Deer DNA Study in the Sierra Nevada and Central Coast Ranges Posted last month
    Deer population estimates are an important element of the California Department of Fish and Wildlife’s (CDFW) management decisions regarding the species – including setting quotas for deer-hunting seasons, acquiring land and identifying habitat improvement projects. Historically, ...
  • The Long Journey of Heenan Lake’s Lahontan Cutthroat Trout Posted last month
    For generations, anglers in California’s eastern Sierra Nevada mountains fished for one of the most cherished fish in the west, the Lahontan cutthroat trout (LCT). These native beauties are prized for their size, with some growing as large as ...
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