1 / 15

Hatchery Subyearling Survival Lower Granite to McNary Dam 1998 to 2009 (preliminary results)

Hatchery Subyearling Survival Lower Granite to McNary Dam 1998 to 2009 (preliminary results). Fish Passage Center. Overview. PIT-tagged Hatchery Subyearling Chinook passing LGR dam during two-week blocks from May 20 to July 15 each year--from release sites

genera
Download Presentation

Hatchery Subyearling Survival Lower Granite to McNary Dam 1998 to 2009 (preliminary results)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Hatchery Subyearling Survival Lower Granite to McNary Dam 1998 to 2009(preliminary results) Fish Passage Center

  2. Overview • PIT-tagged Hatchery Subyearling Chinook passing LGR dam during two-week blocks from May 20 to July 15 each year--from release sites ( 'GRAND1','SNAKE3','SNAKE4','LUGUAF','NPTH','NLVP‘) • Estimate Survival and Travel Time for blocks • Assign average environmental variables during passage such as Flow, Spill, Temperature and Water Transit Time • Show bivariate plots of Reach Survival and environmental variables.

  3. Lower Granite to McNary Dam Reach

  4. Water Transit Time • WTT--Avg Time for Water Particle to Transit Reservoir • Q -- discharge at dam

  5. Converting Flows to Water Transit Time

  6. Survival for Hatchery Subyearling Chinook LGR to McN 1998 to 2009 with 95% CI’s

  7. Comparison of Environmental conditions at LGS Flows in 2009 were lower than 2008 and 2006 but relatively high compared to other years Avg spill volumes were high in 2009 similar to other years since 2005 Temperatures were similar to other years-- except for cool temps in 2008

  8. Spill Percent by site May to July

  9. Hatchery Subyearling Chinook Survival vs Avg Spill Pct LGS, LMN, IHR, McN

  10. Hatchery Subyearling Chinook Survival vs sum WTT LGS, LMN, IHR, McN

  11. Hatchery Subyearling Chinook Survival vs Avg Temp LGS, LMN, IHR, McN

  12. Pearson Correlation Matrix

  13. Hatchery Subyearling Chinook Survival vs WTT and Spill Proportion

  14. Probability of being transported

  15. Conclusions • For actively migrating subyearling Chinook, increased spill and decreased water transit time (higher flows) improve survival, while higher temperatures decrease survival • Survivals were relatively high in 2009 because of high flows through June and above average spill while temperatures were near average for period of years analyzed

More Related