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Trends in Central Valley Chinook Salmon In-River Escapement

Trends in Central Valley Chinook Salmon In-River Escapement. Charles Hanson, Ph.D. State Water Contractors October 2004. INCREASING TREND IN ADULT ESCAPEMENT. Fall-run Late fall-run Spring-run Winter-run.

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Trends in Central Valley Chinook Salmon In-River Escapement

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  1. Trends in Central Valley Chinook Salmon In-River Escapement Charles Hanson, Ph.D. State Water Contractors October 2004

  2. INCREASING TREND IN ADULT ESCAPEMENT Fall-run Late fall-run Spring-run Winter-run

  3. FALL-RUN CHINOOK ESCAPEMENT EXCEEDED DOUBLING OBJECTIVE OVER PAST 4 YEARS

  4. NOAA proposal to downgrade listing from endangered to threatened • WINTER-RUN COHORT REPLACEMENT RATES GREATER THAN 1.0 IN RECENT YEARS

  5. SPRING-RUN IMPROVING BUT HAVE NOT YET MET DOUBLING GOAL LATE FALL-RUN MET GOAL IN 2 OUT OF LAST 6 YEARS

  6. Restoration/enhancement actions in Delta and tributaries Favorable hydrology Favorable ocean rearing Management changes (reduced ocean harvest) • VARIETY OF FACTORS CONTRIBUTE TO TRENDS

  7. CHANGES IN HATCHERY MANAGEMENT

  8. Delta cross-channel VAMP Late fall/winter Sacramento River survival Contributing to scientific foundation for improved protection/management • ONGOING MANAGEMENT INVESTIGATIONS

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