Marine Survival of Klamath River Coho Salmon Cramer Fish Sciences Funded by US Bureau of Reclamation Thomas Nickelson.

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Presentation transcript:

Marine Survival of Klamath River Coho Salmon Cramer Fish Sciences Funded by US Bureau of Reclamation Thomas Nickelson

Purpose Gain a better understanding of the interannual variation in marine survival of Klamath Basin coho salmon

Approach Reconstruct an index of marine survival of Klamath Basin Coho Compare survival of coho released from Iron Gate and Trinity hatcheries Compare survival trends of Klamath coho with trends in survival of coho from Oregon Compare trends in survival of Klamath coho with trends in ocean conditions

Methods Analyze releases of CWT coho salmon from Klamath, Trinity, and Rogue River hatcheries. Analyze release and return data where CWT data are not available. Compare survival rates among hatcheries, OPI, and with ocean conditions.

Reconstruct an index of marine survival of Klamath Basin Coho

Iron Gate coho survival

Conclusion There is considerable interannual variation in marine survival of coho salmon from the Klamath Basin

Compare survival of coho released from Iron Gate and Trinity hatcheries

IGH and TRH coho survival

Conclusions Interannual variation in marine survival of coho salmon from the mainstem Klamath and the Trinity is correlated. Return rates to IGH probably underestimate marine survival because returning adults stray.

Compare survival trends of Klamath coho with trends in survival of coho from Oregon

IGH vs. Oregon coho survival

IGH vs. CRH coho survival

IGH vs. CRH

IGH vs. OPI coho survival

Conclusions Interannual variation in marine survival of coho salmon from the Klamath and the Rogue rivers is correlated. Survival of coho salmon from IGH appears to be higher that that for coho from CRH. Correlations between survival of coho salmon from IGH and survival of OPI coho are poor.

Compare trends in survival of Klamath coho with trends in ocean conditions

Iron Gate coho survival

IGH coho survival- p values Cole RiversOPIUpwelling volumeJD of upwelling Brood yearsGroupSurvival N Iron Gate Cole Rivers OPI Iron Gate Cole Rivers OPI Iron Gate Cole Rivers OPI 0.044

Conclusions Interannual variation in marine survival of coho salmon from the Klamath is correlated with indices of ocean condition. The relationships between survival of Klamath coho and ocean conditions have changed through time. Other factors such as ocean temperature probably influence survival of Klamath coho.