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Timing of entry, distribution, and condition of chum salmon juveniles in western Alaska

Timing of entry, distribution, and condition of chum salmon juveniles in western Alaska. Nicola Hillgruber Christian E. Zimmerman Sean E. Burril. Outline. Introduction & Background Methods Results Fish catches and timing of outmigration Distribution Size and condition

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Timing of entry, distribution, and condition of chum salmon juveniles in western Alaska

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  1. Timing of entry, distribution, and condition of chum salmon juveniles in western Alaska Nicola Hillgruber Christian E. Zimmerman Sean E. Burril

  2. Outline • Introduction & Background • Methods • Results • Fish catches and timing of outmigration • Distribution • Size and condition • Otolith microchemistry • Conclusions

  3. Methods

  4. Kuskokwim Bay, western Alaska Bethel Kwethluk River Ishkowik River Eek Quinhagak

  5. Sampling Stations

  6. Methods

  7. Sampling Trips

  8. Results Fish abundance and timing of outmigration

  9. Catch summary in 2003 and 2004

  10. Mean CPUE (±SE) of juvenile chum salmon at the head of Kuskokwim Bay (station 1-3)

  11. 2003 2004 Mean CPUE for juvenile salmonids at the head of Kuskokwim Bay (station 1-3) Coho Pink Chinook Sockeye

  12. Results Environmental factors and juvenile chum salmon distribution

  13. SST and SSS in 2004 5/16-5/22 Temperature Salinity 6/06-6/12

  14. 5/16-5/22 5/23-5/29 5/30-6/05 6/06-6/12 Surface density [m-3] of small copepod in 2004

  15. 5/16-5/22 5/23-5/29 No Chum 0 - 0.01 0.01 - 0.1 0.1 - 1.0 5/30-6/05 6/06-6/12 1.0 – 10.0 10.0 – 30.0 Chum salmon CPUE in 2004

  16. Chum salmon CPUE by SSS

  17. Results Size and condition

  18. Weight and length of chum salmon juveniles 2004 2003 Weight [g] 18 62 48 162 56 3 0 Fork Length [mm] FL = 173.1 mm (Aug/Sept) Farley et al.

  19. 815 river km Aug/Sept (Farley pers. comm.) 58 32 21 111 3 69 0 58 23 59 Energy content by size and month in 2004

  20. Results Otolith microchemistry

  21. Determination of saltwater entry for Kuskokwim Bay chum and Chinook salmon Collected at SSS=12

  22. Conclusions • Chum emigration peaked in early/middle June • Juveniles followed the river plume before moving into the bay • Length and weight increased with season • Condition decreased with size, season, SST • No distinct saltwater entry signal for chum salmon juveniles

  23. Acknowledgements • Mikhail Blikshteyn • Johnny Zutz • Jim Peacock • Bill Wiebe • Wendy Whelan • Switgard Duesterloh

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