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CONFERENCE SCHEDULE UPDATES & CHANGES: As a result of the prolonged government shutdown, we experienced a number of cancellations and changes to the schedule. Cancellations and changes are listed here (as of January 26, 2019). 
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Monday, January 28 • 3:40pm - 4:00pm
(FISHERIES: INVASIVE SPECIES 1) Intensive Harvest of Bigheaded Carps Using the Unified Method in a Floodplain Lake in Missouri, USA

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AUTHORS: Jeffrey C. Jolley, Duane C. Chapman, Katelyn M. Lawson – US Geological Survey; Wyatt J. Doyle, US Fish and Wildlife Service; Kevin J. Meneau, Missouri Department of Conservation

ABSTRACT: Intensive and efficient harvest methods for invasive Asian carp in the Mississippi River Basin may alleviate negative effects of overabundance and are desired by fisheries managers.  Commercial desirability of these fish may provide economic benefits, as well.  We conducted a mass harvest at Creve Coeur Lake, Missouri using the Unified Method which was developed by Chinese fishers for harvesting carp from floodplain production lakes.  The method consists of using a variety of driving, herding, and netting techniques, in unison, to concentrate large numbers of fish from large waterbodies to a defined collection location.  We used a combination of boat electrofishing, electrified trawling, and boat-mounted acoustic deterrents to drive fish from a series of block-netted cells in the lake to concentrate fish.  Driving methods were extremely successful and 80% of the lake was mostly cleared of fish in seven days of work.  Fish behavior eventually changed when high concentrations were created and driving methods had greatly reduced effectiveness.  Fish were not successfully driven into an Iruka-style stownet likely due to a combination of water depth, physical location, and mouth opening size.  We used beach seining techniques using block nets to capture large schools of fish that had formed.  Four seine hauls resulted in 108 metric tons of Asian carp removed from the lake.  Preliminary estimates suggest that at least 50% of the Asian carp (> 40,000 fish) were harvested from the lake.  Analyses of companion environmental DNA, hyrdoacoustics, and mark-recapture data will provide additional information on efficiency of harvest. 

Monday January 28, 2019 3:40pm - 4:00pm EST