Lees ferry fish monitoring
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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 Fish Monitoring

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Lees ferry fish monitoring

Lees Ferry Fish Monitoring


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


Lees ferry fish monitoring

  • Mean peak discharge = 18,823 ± 2,518 cfs

  • Mean discharge = 12,816 ± 683 cfs

Modified low fluctuating flows

1991-2010


Lees ferry fish monitoring

1996-HFE

  • Max-45,600 cfs

  • Mean-15,235 ± 529 cfs


Lees ferry fish monitoring

2000-LSSF

  • Max-30,900 cfs

  • Mean- 8,355 ± 22.4 cfs


Lees ferry fish monitoring

2003-TSF


Lees ferry fish monitoring

2004-TSF


Lees ferry fish monitoring

2004-HFE

  • Max-41,900 cfs

  • Mean- 11,789 ± 395 cfs


Lees ferry fish monitoring

2005-TSF


Lees ferry fish monitoring

2008-HFE

  • Max-42,500 cfs

  • Mean- 12,830 ± 326 cfs


Lees ferry fish monitoring

2011-EqF

  • Max-26,200 cfs

  • 2011 Mean- 19,326 ± 380 cfs

  • May-Aug Mean-24,280 ± 257 cfs


Lees ferry fish monitoring

  • 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


Lees ferry fish monitoring

Lees Ferry Standardized Monitoring

Juveniles


Lees ferry fish monitoring

Lees Ferry Standardized Monitoring

306-405 mm

306-405


Lees ferry fish monitoring

Lees Ferry Standardized Monitoring

>405 mm


Lees ferry fish monitoring

2011-EqF

2008-HFE


Lees ferry fish monitoring

Rainbow trout <152 mm

2011 EQ

2008 HFE


Lees ferry fish monitoring

Rainbow trout <152 mm

2008 Cohort

2011 EQ

2008 HFE


Lees ferry fish monitoring

Average total length by year


Lees ferry fish monitoring

Lees Ferry Creel

1991-2011


Lees ferry fish monitoring

Low Angler Catch Rate

High Angler Catch Rate

0.4 fish/hr

1.4 fish/hr

0.6 fish/hr

1.5 fish/hr


Lees ferry fish monitoring

Additional species captured during sampling


Native fish in the tailwater to glen canyon dam

Native Fish in the Tailwater to Glen Canyon Dam


Mainstem fish monitoring

Mainstem Fish Monitoring


Lees ferry fish monitoring

Rainbow trout


Lees ferry fish monitoring

Rainbow trout

2000-2011

GCD


Lees ferry fish monitoring

Rainbow trout

2000-2011

GCD


Lees ferry fish monitoring

Rainbow trout

6-fold decrease in CPUE from RM 58  63

GCD


Lees ferry fish monitoring

Brown trout


Lees ferry fish monitoring

Brown trout

2000-2011

GCD


Lees ferry fish monitoring

Common carp


Lees ferry fish monitoring

Common carp

2000-2011

GCD


Lees ferry fish monitoring

Flannelmouth Sucker


Lees ferry fish monitoring

Flannelmouth Sucker

2000-2011

GCD


Lees ferry fish monitoring

BlueheadSucker


Lees ferry fish monitoring

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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