View source for Bioenergetics Studies


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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">Updates</h2>

[[Image:BoomBust.jpg|center|500px]]
[[Image:TroutDecline.jpg|center|500px]]
[[Image:HFEsTroutCondition.jpg|center|500px]]
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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Links and Information</h2>
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*[http://gcdamp.com/index.php?title=FISHERY Rainbow Trout Page]
*[http://gcdamp.com/index.php?title=Humpback_Chub_Page Humpback Chub Page]
*[http://gcdamp.com/index.php?title=FOOD_BASE Aquatic Foodbase Page] 
*[http://gcdamp.com/index.php?title=Nutrients Nutrients Page] 

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Projects</h2>
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*[http://gcdamp.com/index.php?title=Natal_Origins_Project_(NO) Natal Origins Project (NO)]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Presentations and Papers</h2>
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'''2017'''
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR15_Korman.pdf  Boom-and-Bust Cycles in the Population of Rainbow Trout in Glen Canyon and Effect of Fall High Flow Experiments ]

'''2016'''
*[https://pubs.er.usgs.gov/publication/70157074 Yard et al. 2016. Seasonal and spatial patterns of growth of rainbow trout in the Colorado River in Grand Canyon, AZ. Canadian Journal of Fisheries and Aquatic Sciences]
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/16jan26/index.html Bioenergetic Modeling of Glen Canyon Rainbow Trout Fishery: Exploring effects of temperature, trout population size and biomass on benthic invertebrate consumption]
*[http://www.nrcresearchpress.com/doi/abs/10.1139/cjfas-2015-0268#.Vr49syArKUm Prey size and availability limits maximum size of rainbow trout in a large tailwater--insights from a drift-foraging bioenergetics model]

'''2015'''
*[[2015 News about the declining fish status at Fishery| Update on the 2015 decline in fish condition and abundance at Lees Ferry]]
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15jan20/Attach_18.pdf Rainbow Trout Growth, Condition, Population Dynamics and Modeling in Glen Canyon]
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15jan20/Attach_19.pdf Drift-Foraging and Bioenergetics Growth Model for Rainbow Trout in the Lees Ferry Tailwater]

'''2013'''
*[https://www.usbr.gov/uc/rm/amp/amwg/mtgs/13aug08/Attach_07d.pdf Fact Sheet: Native and Nonnative Fish Populations of the Colorado River are Food Limited--Evidence from New Food Web Analyses]

'''2011'''
*[http://www.tandfonline.com/doi/abs/10.1577/T04-090.1?src=recsys&journalCode=utaf20 Petersen and Paukert. 2011. Development of a Bioenergetics Model for Humpback Chub and Evaluation of Water Temperature Changes in the Grand Canyon, Colorado River. Transactions of the American Fisheries Society, Volume 134, 2005 - Issue 4.]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Potential Policy Implications [https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR15_Korman.pdf]</h2>
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Avoid boom-and-bust cycles to reduce trout export to LCR and maintain consistent catch rates and larger trout in the fishery:
*Enhance food supply via ‘bug flows’ or fertilization (add liquid nitrogen & phosphorous) as a mitigation for fluctuating flows and low reservoir elevation
*Limit recruitment via Trout Management Flows (TMFs)
*Do not implement fall HFEs in years when trout are in poor condition
*Fertilize prior to conducting an HFE to mitigate negative effects

Critical uncertainties:
*Will TMFs be implemented & work? What years to implement (e.g., 2016)?
*Will bug flows or fertilization increase food supply?
*Does enhanced food supply increase or decrease extent of trout export?

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Monitoring Needs [https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR15_Korman.pdf]</h2>
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STAY ON THE ROAD TO LEARNING: Estimate growth, survival, recruitment, and abundance by mark-recapture at time- scale that is fine enough to address GCD AMP questions.
*Response of recruitment to a particular flow in one year (e.g. spring HFE, 2011 equalization)
*Seasonal effects of fall HFEs on growth
*“Identify approaches to determine the root cause(s) of the unstable trout population in Lees Ferry” (#1 question)
*Measure export of trout from Glen Canyon to upper Marble Canyon (tagging not needed)

The current Catch-Per-Effort survey provides imprecise indices of recruitment and abundance.
*Useful for assessing trends in population over longer blocks of time (e.g. 5 yrs), but not for tracking annual changes needed to address management questions.
*Growth is not estimated from CPE surveys but is needed to understand why recruitment and abundance are changing, and effects of fall HFEs.

Two choices for TWG:
*Keep asking current management questions and therefore continue with mark-recapture program that can address these questions.
*Ask much simpler questions restricted to long-term trends in status which can be addressed from current CPE program. 

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