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Tuesday, January 30 • 10:40am - 11:00am
RIVERS & OXBOWS: Larval Fish Community Survey of Pools 19, 18, and 17 of the Upper Mississippi River

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AUTHORS. Boone M. La Hood, James T. Lamer, Allison W. Lenaerts - Kibbe Field Station-Western Illinois University; Kevin S. Irons, Division of Fisheries-Illinois Department of Natural Resources

ABSTRACT. Lock and dam 19 in Keokuk, IA has slowed the establishment of Asian carp in the Upper Mississippi River.  Mature Asian carp populations north of lock and dam 19 exist at low densities and are intensively studied.  However, larval fish communities in this region are not well characterized or investigated.  The objectives of our study were to describe larval fish community structure and monitor for larval Asian carp at their northern invasion front in the Mississippi River.  We used quadrafoil light traps to collect larval fish in Pools 17-19 of the Mississippi River.  These traps exploit the phototactic swimming behavior of post-yolksac larval fish and are illuminated with green chemical light sticks.  We deployed 12 traps per night from May to September of 2016 at water temperatures = 17°C.  Traps were fished on 58 sampling days for a minimum of 1 hour (n=649 traps, 1,995 trap hours).  We sampled areas in Pools 17-19 with minimal flow consisting of woody, vegetated, and coverless habitats.  Native cyprinids and centrarchids dominated our catch.  Detections of larval and juvenile Asian carp were widespread in our Pool 19 samples, but absent above lock and dam 18.  We also observed multiple emergences of larval Asian carp, suggesting that there were multiple spawning events and that conditions were adequate for larval Asian carp reproduction and recruitment in Pool 19 of the Upper Mississippi River during the summer of 2016. 

Tuesday January 30, 2018 10:40am - 11:00am CST