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Purpose/Objective:
- Understand white sturgeon and green sturgeon population dynamics.
- Determine how abundance, distribution, and mortality rates of adult
sturgeon are affected by water development and the sport fishery.
- If sturgeon populations are negatively impacted by changes in freshwater
outflow and water export associated with water development, develop
criteria to reduce the impacts.
- If the sport fishery causes unacceptably high mortality on the populations,
address through changes in angling regulations.
ACTIVITIES:
Abundance estimates are made using tag and recapture methods. Sturgeon are
tagged and released in San Pablo Bay during fall. Each tagged fish is
measured. A year-round creel census is conducted to learn the tagged to
untagged ratio and to determine the size composition of catch. Tag returns
(corrected for non-response using reward tags) are used to estimate annual
harvest rates, mortality rates and migrations.
For more information about this program element contact:
Marty Gingras, California Department of Fish and Game
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