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

Published byTimothy Nash Modified over 9 years ago

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Presentation on theme: "Marine Survival of Klamath River Coho Salmon Cramer Fish Sciences Funded by US Bureau of Reclamation Thomas Nickelson."— Presentation transcript:

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

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

3 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

4 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.

5 Reconstruct an index of marine survival of Klamath Basin Coho

6 Iron Gate coho survival

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

8 Compare survival of coho released from Iron Gate and Trinity hatcheries

9 IGH and TRH coho survival

10

11 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.

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

13 IGH vs. Oregon coho survival

14 IGH vs. CRH coho survival

15 IGH vs. CRH

16 IGH vs. OPI coho survival

17 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.

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

19 Iron Gate coho survival

20

21 IGH coho survival- p values Cole RiversOPIUpwelling volumeJD of upwelling Brood yearsGroupSurvival Mar.-Sept. @ 39Ntransition @ 42-48N 1977-2001Iron Gate0.0350.0320.3810.005 1977-2001Cole Rivers 0.2960.0160.050 1977-2001OPI 0.956 0.000 1977-1990Iron Gate0.0070.1270.0370.048 1977-1990Cole Rivers 0.5620.0380.075 1977-1990OPI 0.7260.000 1991-2001Iron Gate0.0660.4800.7730.069 1991-2001Cole Rivers 0.1300.5930.048 1991-2001OPI 0.044

22 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.

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