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Lees Ferry Fish Monitoring

Lees Ferry Fish Monitoring

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Lees Ferry Fish Monitoring

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  1. Lees Ferry Fish Monitoring

  2. Lees Ferry Monitoring • How do Glen Canyon Dam operations influence the rainbow trout fishery? • Annual sampling • Electrofishing • Abundance, Size • Angler Surveys • Catch rates

  3. Mean peak discharge = 18,823 ± 2,518 cfs • Mean discharge = 12,816 ± 683 cfs Modified low fluctuating flows 1991-2010

  4. 1996-HFE • Max-45,600 cfs • Mean-15,235 ± 529 cfs

  5. 2000-LSSF • Max-30,900 cfs • Mean- 8,355 ± 22.4 cfs

  6. 2003-TSF

  7. 2004-TSF

  8. 2004-HFE • Max-41,900 cfs • Mean- 11,789 ± 395 cfs

  9. 2005-TSF

  10. 2008-HFE • Max-42,500 cfs • Mean- 12,830 ± 326 cfs

  11. 2011-EqF • Max-26,200 cfs • 2011 Mean- 19,326 ± 380 cfs • May-Aug Mean-24,280 ± 257 cfs

  12. 2011 – 6.9 ± 1.35 fish/min • 1991-2010 - 3.1 ± 0.52 fish/min 2003-2005 TSF 2000 LSSF 2008HFE 2011 EqF 1996 HFE 2004 HFE

  13. Lees Ferry Standardized Monitoring Juveniles

  14. Lees Ferry Standardized Monitoring 306-405 mm 306-405

  15. Lees Ferry Standardized Monitoring >405 mm

  16. 2011-EqF 2008-HFE

  17. Rainbow trout <152 mm 2011 EQ 2008 HFE

  18. Rainbow trout <152 mm 2008 Cohort 2011 EQ 2008 HFE

  19. Average total length by year

  20. Lees Ferry Creel 1991-2011

  21. Low Angler Catch Rate High Angler Catch Rate 0.4 fish/hr 1.4 fish/hr 0.6 fish/hr 1.5 fish/hr

  22. Additional species captured during sampling

  23. Native Fish in the Tailwater to Glen Canyon Dam

  24. Mainstem Fish Monitoring

  25. Rainbow trout

  26. Rainbow trout 2000-2011 GCD

  27. Rainbow trout 2000-2011 GCD

  28. Rainbow trout 6-fold decrease in CPUE from RM 58  63 GCD

  29. Brown trout

  30. Brown trout 2000-2011 GCD

  31. Common carp

  32. Common carp 2000-2011 GCD

  33. Flannelmouth Sucker

  34. Flannelmouth Sucker 2000-2011 GCD

  35. BlueheadSucker

  36. BlueheadSucker GCD

  37. Fish Management? • Vision • DFC… Desired Future Conditions • ORV… Outstanding and Remarkable Values • Compromise • Do you want big fish or a lot of fish? • Fish are not the only resource being managed for downstream of GCD • Feasibility • Fiscal • Legal • Logistical • Political

  38. Fish Management? • Implementation (a few tools) • Add fish • Translocation • Augmentation • Stocking • Remove Fish • Mechanical Removal • Chemical Removal • Change in regulations • Habitat manipulation • Advantageous or disadvantageous for certain species • Flows • Temperature • Sediment • Food base • Feasibility

  39. Fish Management? • Uncertainty/Patience • Adaptive management • Utilize best available information to design experiments to drive resource towards desired condition • Experiment • Monitor resource/resources • Analyze data and compare current resource/resources to that of desired condition • Go back to step 1 as necessary to reach desired conditions • Continue to monitor • Feasibility • Public Outreach • Throughout the process