wyoming bighorn fisheries update 2018-2019 · wyoming bighorn fisheries update 2018-2019. joe...
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![Page 1: Wyoming Bighorn Fisheries Update 2018-2019 · Wyoming Bighorn Fisheries Update 2018-2019. Joe Skorupski WGFD. Bighorn Issues Group meeting April 2019](https://reader033.vdocuments.site/reader033/viewer/2022060416/5f13e09aad7b596208635ea4/html5/thumbnails/1.jpg)
Wyoming Bighorn Fisheries Update
2018-2019
Joe SkorupskiWGFD
Bighorn Issues Group meeting April 2019
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Overview• Bighorn System• Managed fisheries• Sauger• Monitoring• Research
• Sturgeon• Research
• Sturgeon Chub• Monitoring
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Bighorn System• Lake and River not independent
– Migratory native species– CCF, SAR, SNS, SGC
• Forage production• Wintering habitat• YOY sauger• Recreation
– 6 months
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Model
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Sauger & Walleye• Objective
– Maintain sauger CPUE of >0.75/h• Monitoring
– Gill Nets• Fall
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Sauger & Walleye
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Sauger
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The Plus Side of Big Water Years• River flows and temperaturepatterns more optimal forrecruitment
Year CPUE2008 25.02011 22.02012 02013 02014 6.32015 0.82016 02017 --2018 113.0
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Sturgeon Reintroduction in the Bighorn River
Objectives1) Establish a self-sustaining population of sturgeon2) Provide a unique sport fishing opportunity3) Increase biodiversity of Bighorn River
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Research ProjectObjectives:
1) Identify spawning sites
2) Model embryo drift distances
3) Validate drift distance estimates with larval drift sampling
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Objectives:
1) Identify spawning sites• 3 confirmed spawning
sites
2) Model embryo drift distances• Being completed
3) Validate drift distance estimates with larval drift sampling
• No captured larvae
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Expected Outcome• Self-sustaining population?• 2019 final year–Validate drift distances
• Drift netting
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Future Management• Continue tagging all age classes
– Long-term monitoring• Continue stocking through 2020
– Scute removal on 5 cohorts• Trawling for YOY
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Sturgeon Chub
• Petitioned for listing– 2016– Warranted– 12 month review
• Objective– Present in Bighorn?– Where?
• eDNA• Trawl sampling
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Sturgeon Chub
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Future Work• Channel Catfish aging
– Inform us on population in bighorn system• Age structure• Inform year-class strength• Recruitment consistency• Annual mortality
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Conclusions
• Interconnected Bighorn system• Native fishes: Sport and small-bodied
– CCF, SAR, SNS, SGC• Forage production• Wintering habitat• YOY sauger• Recreational opportunities
– 6 months
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Questions?