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Tuesday, February 7 • 6:00pm - 9:00pm
Poster Display. Attractants for Asian Carp Larvae

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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 CST
Lancaster Ballroom

Attendees (3)