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Lees Ferry Fish Monitoring. Lees Ferry Monitoring. How do Glen Canyon Dam operations influence the rainbow trout fishery?. Annual sampling Electrofishing Abundance, Size Angler Surveys Catch rates. Mean peak discharge = 18,823 ± 2,518 cfs Mean discharge = 12,816 ± 683 cfs.

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Lees Ferry Monitoring

  • How do Glen Canyon Dam operations influence the rainbow trout fishery?

  • Annual sampling

    • Electrofishing

      • Abundance, Size

    • Angler Surveys

      • Catch rates


Modified low fluctuating flows

1991-2010


1996-HFE

  • Max-45,600 cfs

  • Mean-15,235 ± 529 cfs


2000-LSSF

  • Max-30,900 cfs

  • Mean- 8,355 ± 22.4 cfs




2004-HFE

  • Max-41,900 cfs

  • Mean- 11,789 ± 395 cfs



2008-HFE

  • Max-42,500 cfs

  • Mean- 12,830 ± 326 cfs


2011-EqF

  • Max-26,200 cfs

  • 2011 Mean- 19,326 ± 380 cfs

  • May-Aug Mean-24,280 ± 257 cfs


  • 1991-2010 - 3.1 ± 0.52 fish/min

2003-2005

TSF

2000 LSSF

2008HFE

2011 EqF

1996 HFE

2004 HFE





2011-EqF

2008-HFE


Rainbow trout <152 mm

2011 EQ

2008 HFE


Rainbow trout <152 mm

2008 Cohort

2011 EQ

2008 HFE



Lees Ferry Creel

1991-2011


Low Angler Catch Rate

High Angler Catch Rate

0.4 fish/hr

1.4 fish/hr

0.6 fish/hr

1.5 fish/hr



Native fish in the tailwater to glen canyon dam

Native Fish in the Tailwater to Glen Canyon Dam



Rainbow trout


Rainbow trout

2000-2011

GCD


Rainbow trout

2000-2011

GCD


Rainbow trout

6-fold decrease in CPUE from RM 58  63

GCD


Brown trout


Brown trout

2000-2011

GCD



Common carp

2000-2011

GCD



Flannelmouth Sucker

2000-2011

GCD


BlueheadSucker


BlueheadSucker

GCD


Fish management
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


Fish management1
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


Fish management2
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


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