Difference between revisions of "Brown Trout"
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[[File:BrownTrouSizetLeesFerry_USGS2016.jpg|center|650px]] [http://www.usbr.gov/uc/rm/amp/amwg/mtgs/16aug24/Attach_07a.pdf] | [[File:BrownTrouSizetLeesFerry_USGS2016.jpg|center|650px]] [http://www.usbr.gov/uc/rm/amp/amwg/mtgs/16aug24/Attach_07a.pdf] | ||
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*[https://www.nps.gov/grca/learn/nature/trout-reduction.htm The NPS Bright Angel Creek Trout Reduction Project] | *[https://www.nps.gov/grca/learn/nature/trout-reduction.htm The NPS Bright Angel Creek Trout Reduction Project] | ||
*[http://gcdamp.com/index.php?title=Humpback_Chub_Page Humpback Chub Page] | *[http://gcdamp.com/index.php?title=Humpback_Chub_Page Humpback Chub 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;">The Brown Trout Workshop</h2> | ||
+ | |- | ||
+ | |style="color:#000;"| | ||
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+ | *[https://www.usbr.gov/uc/rm/amp/amwg/mtgs/17sep20/BT_Agenda.pdf Brown Trout Workshop Agenda, September 21-22, 2017] | ||
+ | *[[Media:Brown Trout White Paper 2017-09-21 Final for Workshop.pdf| White Paper: Brown Trout below Glen Canyon Dam: A Preliminary Analysis of Risks and Options; Final Pre-Workshop Version; September 21, 2017]] | ||
+ | *[[Media:Kennedy brown trout workshop root causes for posting.pdf| Root Causes presentation]] | ||
+ | *[[Media:Yackulic brown trout workshop Risks-for posting.pdf| Risks presentation]] | ||
+ | *[[Media:Bair Brown Trout workshop management options-for posting.pdf| Management Options presentation]] | ||
+ | *[[Media:LetterToNPS-planning.pdf| Letter from Brent Rhees, Acting Secretary's Designee, to NPS requesting a 2017 brown trout workshop.]] | ||
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+ | == Action requested. Proposed draft motion AMWG meeting 2/15/17: == | ||
+ | The AMWG believes that before moving forward with any new actions to manage brown | ||
+ | trout in the Lees Ferry reach of the Colorado River, it would be beneficial to work to | ||
+ | develop a plan based on the most up to date information and that has involvement | ||
+ | from interested members of the AMWG. Accordingly, the AMWG requests that the | ||
+ | Secretary of the Interior direct the National Park Service, and request the Arizona Game and | ||
+ | Fish Department, to organize and facilitate a workshop among scientists, managers, tribes, | ||
+ | and interested stakeholders to address: | ||
+ | # The root causes of the increases in brown trout, | ||
+ | # The risks associated with an expanding brown trout population to a quality rainbow trout fishery in Lees Ferry and the recovery/conservation of humpback chub and other native fish down river, | ||
+ | # The pros and cons of different management options to address those risks, and | ||
+ | # The research needs to support more informed decisions moving forward. | ||
+ | The workshop should also review the efficacy of the current High Flow Experiment protocol in light of new | ||
+ | scientific information and how it could be modified to allow for more frequent Spring HFEs | ||
+ | to conserve sediment and enhance biological resources in the Colorado River below Glen | ||
+ | Canyon dam. Results from the workshop, and any recommended actions based on them, | ||
+ | should be reported to the TWG for consideration in development of the Triennial Work | ||
+ | Plan and presented to the AMWG at the August 2017 meeting. | ||
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Revision as of 16:09, 16 October 2017
Brown trout caught at the LCR during the 2013 summer Natal Origins trip |
Brown TroutBrown trout are native to Europe and were introduced to tributaries in the Grand Canyon in the 1920s. They are capable of withstanding slightly higher temperature than rainbow trout. Unlike most other trout species, brown trout spawn in the late fall. Their spawning behavior, however, is similar to other trout species. Like rainbow trout, young brown trout feed on aquatic and terrestrial insects and invertebrates but brown trout are more apt to switch to eating other fish as they get bigger. The rainbow trout found in Grand Canyon are more likely to continue to eat mostly insects and invertebrates even as adults. [1] [2] Studies have shown that rainbow trout and native fish like humpback chub often have a difficult time persisting in the presence of a large population of brown trout. [3] [4] [5] Desired Future Condition for the Lees Ferry Trout FisheryA high quality trout fishery in GCNRA, as further described in the Recreation DFC that does not adversely affect the native aquatic community in GCNP. |
Rainbow Trout | Brown Trout |
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