utah lake carp removal status update utah chapter of american fisheries society: march 22, 2011...
TRANSCRIPT
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Utah Lake Carp Removal Status Update Utah Chapter of American Fisheries Society: March 22, 2011
Michael Mills
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BackgroundUtah Lake
• Large (96,000 acres)• Shallow (Max Depth 14’) • Highly Productive• Algae dominated system• Natural habitat of the
endangered June sucker
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Scheffer 1997
BackgroundCommon Carp
• Introduced into the Utah Lake watershed
• Dominates the Utah Lake fish community
• Loss of refuge habitat
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Series of Common Carp Research Projects• 2001 – 2002: Identifying non native fish impacts
• Common carp ranked as highest potential for impacting recovery (habitat destruction)
• 2004 – 2006: Population estimates and feasibility of control options• 2005: Potential uses and marketing studies• 2006: Carp tissue contaminants study• 2007 to 2009: Pilot studies – removal and disposal projects • 2009: NEPA Compliance • 2010: Implementation
How Did We Get Here?
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• Population estimate: 7.5 million age-2+ carp – 95% Confidence Interval (4.25 to 8.8 million)– Average weight 5.8 pounds
• Mechanical control is feasible through sustained effort– Remove 5 million pounds per year (~41,000 per day for 120 days)– Commercial fishing (large-scale seining)– 75% reduction in 6 years and 90% reduction in 7 years– Low level harvest to maintain reduced population
Population Estimate and Feasibility Results
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Pilot Projects• October 2008 to April 2009: Test feasibility of annual
removal goal (2.5 million pounds in six months)• Contract awarded to Loy Fisheries after RFP process
• Removed 1.4 million pounds• Need larger equipment and better efficiency
• September 2009 to January 2010: Second Pilot Project• Removed 1.2 million pounds• Removal goals feasible with multiple crews
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Loy Fisheries catch
Goshen Bay, Utah Lake
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Ice Fishing
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Loy Fisheries Carp removalPushing seine under the iceUtah Lake
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Project Implementation February 2010: Issued Contract for first 5
Million Pounds• NEPA Compliance
– USFWS issued a Environmental Assessment and FONSI in January of 2010
• Securing funding– Received grant from USFWS to fund first year of removal
• Total removed: 3.29 Million Pounds– Average 22,880 pounds per day fished
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Commercial Fishery Observers
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Summary• 4.48 Million pounds removed since September 2009• Ongoing challenges:
• Disposal/marketing, Maintaining catch rates, Preventing population rebound
• Collaborating with other systems• Peter Sorensen, University of Minnesota• Malheur National Wildlife Refuge, Oregon
• Research on ways to improve catch rates and target younger fish
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Questions???
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2 Pilot Projects: October 2008 to April 2009 • Goal: Remove 2.5 million pounds in six months
• Test feasibility of annual removal target (5 Million pounds)
• Contract awarded to Loy Fisheries after RFP process
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From left: Chad Landress (UDWR), Riley Peck (UDWR), Bill Loy (Loy Fisheries), Jeff (Loy Fisheries), Cody (Loy Fisheries)
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2008 Pilot Project ResultsProject ran from October 2008 to April
2009• Total removed = 1.47 million pounds• Over 500,000 pounds removed through the ice• Best days exceeded 60,000 pounds• Average 20,993 pounds per day fished (4,520 to 64,980)• Very low by-catch• Needs:
• Larger equipment,• More mechanization
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2009 Pilot Project ResultsProject ran from Sep 2009 to Jan 2010
• Total removed = 1.2 million pounds• Mean daily catch = 20,066 pounds (5,820 to 42,980)• Removal goals are feasible with multiple crews
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Project OutreachCommunicate Project Objectives