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Tuesday, January 26 • 11:20am - 11:40am
A Portable Trap With Electric Lead Removes Up To 80% Of Invasive Sea Lamprey In Free-Flowing Streams.

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AUTHORS: Nicholas Johnson*, USGS, Great Lakes Science Center, Hammond Bay Biological Station; Scott Miehls, USGS, Great Lakes Science Center, Hammond Bay Biological Station

ABSTRACT: A portable sea lamprey trap fitted with a pulsed direct current lead was deployed in a free-flowing reach of Bridgeland Creek, ON, during 2014 and 2015. The portable trap removed 60% of PIT tagged adult sea lamprey that approached within 20 m of the trap during 2014 and about 80% of PIT tagged sea lampreys that approached the trap during 2015. Non-target mortality was rare and impacts to non-target migration were minimal; likely because low voltage pulsed direct current was used and the electric lead only needed to be activated 7 hours of each day. Annual cost of the trapping system, including the cost to deploy, service, and decommission, was estimated at $5,800 (U.S. dollars). Currently, adult sea lamprey trapping is limited to physical barriers that block sea lamprey migration and removal rates average 35%. The pulsed direct current trap lead used here has the potential to substantially improve sea lamprey removal rates at existing barrier-integrated traps and enable trapping on most of the sea lamprey producing tributaries that are not currently trapped (about 95% are not trapped). Similar electric leads may be useful for trapping other invasive species that have riverine spawning migrations or may be useful for guiding valued fishes to safe passage around dams. As such, the technology may substantially advance integrated control of sea lampreys, which threaten a fishery valued at 7 billion U.S. dollars annually, and may be broadly applicable to aquatic invasive species control and fishery restoration worldwide.

Tuesday January 26, 2016 11:20am - 11:40am EST
Ambassador E