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Welcome to the interactive web schedule for the 2019 Midwest Fish & Wildlife Conference! The schedule is subject to change (as of November 20, 2018). Please check back for updates. To return to the main Conference website, go to: www.midwestfw.org.

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Tuesday, January 29 • 1:40pm - 2:00pm
(SYMPOSIA-09) Evaluation of Carbon Dioxide to Stimulate Emergence of Red Swamp Crayfish from Invaded Ponds

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AUTHORS: Jim Stoeckel, Rebecca Tucker, Hisham Abdelrahman – Auburn University; Aaron Cupps, Ann Allert, Kim Fredricks – U.S. Geological Survey; Seth Herbst, Sara Thomas – Michigan Department of Natural Resources; Brian Roth, Michigan State University

ABSTRACT: Reduction of invasive crayfish is a major challenge facing natural resource managers.  We evaluated the ability of carbon dioxide to induce red swamp crayfish (Procambarus clarkii) to leave ponds, and the ability of terrestrial shelters to facilitate collection after emergence.  We placed 100 red swamp crayfish in ~14 x 14 m experimental ponds at Auburn University, Alabama.  Tanks equipped with regulators and diffusers were used to inject CO<sub>2</sub> into experimental ponds whereas control ponds received no CO<sub>2</sub>.  Silt fencing was installed around ponds such that the bottom 2 feet was folded on the ground to serve as shelter, whereas the upper foot was installed vertically on fence posts to serve as a barrier.  Carbon dioxide was elevated to =200 mg/L in experimental ponds while pH was depressed to ~5.5.  Dissolved oxygen remained > 5 mg/L.  Greater than 50% of crayfish emerged within 6 hours.  Of these, 95% remained in sheltered areas underneath the folded fencing. They did not burrow under the fencing and were easily collected.  When a small inflow of non-carbonated fresh water was provided to a pond to simulate an underwater spring, crayfish sought shelter within this small inflow area.  Only 6% exited the pond even though CO<sub>2</sub> quickly reached = 200 mg/L in the surrounding waters.  Results thus far show that carbon dioxide can cause a large proportion of crayfish to emerge from ponds and seek terrestrial shelter within a short time.  Small inflows of non-carbonated water from inlets or springs can provide refuges that may severely limit emergence.  However, if these refuge areas can be identified, they may facilitate removal via trapping or seining.  Results from an invaded retention-pond trial in Michigan are currently being analyzed and will also be presented.

Tuesday January 29, 2019 1:40pm - 2:00pm
HOPE BALLROOM C