Loading…
To return to the Midwest Fish & Wildlife Conference website, go to http://www.midwestfw.org/ The following schedule and room names are subject to change (as of February 1, 2017). Please check back for updates. 

Presenters: 
Presenters for technical presentations are either the primary author (the first name listed in the abstract), or are indicated with an asterisk next to their name. 

Please note:
 the conference schedule is hosted by Sched.org which allows you to search within the schedule, and filter the schedule to show sessions only occurring on a certain date or within a track. You can also build your own schedule by creating a free account with Sched.org by selecting "SIGN UP" in the top right corner. 
Tuesday, February 7 • 6:00pm - 9:00pm
Poster Display. Attractants for Asian Carp Larvae

Sign up or log in to save this to your schedule and see who's attending!

AUTHORS: Ben H. Stahlschmidt, U.S. Geological Survey; Amy E. George, U.S. Geological Survey; Duane C. Chapman, U.S. Geological Survey

ABSTRACT: Asian carp, considered undesirable invasives in North America, spawn in the mainstem of large rivers. After a period of embryonic and larval drift, larvae move into backwaters and other nursery habitats. Swimming ability at this stage is relatively strong and therefore it is likely that larvae have substantial control over nursery habitat selection. However, it is unknown how larvae sense and select nursery habitat. This experiment tested whether certain olfactory stimuli can be used to attract larval Asian carp. This knowledge could potentially be used to attract larvae to targeted areas, which would facilitate removal and disposal. Following initiation of horizontal swimming behavior (coinciding with gas bladder inflation), daily preference tests of attractants were administered to larvae of bighead (Hypophthalmichthys nobilis), silver (H. molitrix), and grass carp (Ctenopharyngodon idella) until the development of the second gas bladder chamber. Fifty larvae of each species were collected and observed each day until the end of the experiment. Chemotactic responses were determined by comparison of tested substances (algae, water taken from holding facilities of conspecifics, rotifers, alarm pheromones, and Asian carp feces) to a control (well water) in a modified Y-maze. Larvae throughout the experiment showed no response to any of the attractants, and largely remained in the no-preference zone of the Y-maze. It is unclear at this point whether larval Asian carp are responding to chemotactic stimuli or to some other stimuli such as water flow or temperature when moving from the main river to the backwater habitats.

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

Attendees (3)