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Tuesday, February 7 • 6:00pm - 9:00pm
Poster Display. Larval Fish Community Survey of Pools 19, 18, and 17 of the Upper Mississippi River

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AUTHORS: Boone M. La Hood, Western Illinois University; James T. Lamer, Western Illinois University; Kevin S. Irons, Illinois Department of Natural Resources

ABSTRACT: We used quadrafoil light traps to sample and monitor larval fish recruitment in Pools 19, 18, and 17 of the Upper Mississippi River.  This portion of the river currently represents the documented northern reproductive front for bigheaded Asian carp (Hypopthalmichthysspp.) on the Mississippi River.  The quadrafoil light traps used were illuminated with green chemical light sticks and exploit the positively phototactic swimming behavior of post-yolksac larval fish and are effective for sampling both native and invasive fish species.  We began deploying traps when water temperatures reached 17 ̊C and continued sampling until water temperatures again fell to below 17 ̊C.  Weather permitting, 12 traps were deployed each night for 4 days a week and allowed to fish for at least 1 hour.  We targeted woody, vegetated, and coverless habitats in backwater areas with little to no flow.  All of the organisms collected in the traps were preserved in a formalin fixative or 95 percent ethanol and brought back to the lab for sorting and identification.  In addition to assessing the community composition of native fish species we also looked for evidence of invasive fish species recruitment.

Tuesday February 7, 2017 6:00pm - 9:00pm CST
Lancaster Ballroom

Attendees (1)