Loading…
Attending this event?
Welcome to the interactive web schedule for the 2019 Midwest Fish & Wildlife Conference! The schedule is subject to change (as of November 7, 2018). Please check back for updates. To return to the main Conference website, go to: www.midwestfw.org.

TIPS FOR NAVIGATING THIS SCHEDULE:
The conference schedule is hosted in SCHED which allows you to search within the schedule, and filter the schedule to show items only occurring on a certain date or within a track/symposia.
  • To view only a certain type of presentation or track, locate the heading "Filter By Type" in the navigation bar. As an example, try clicking on "T01: Fisheries: Great Lakes I".
  • The default view for the schedule is "Simple" which only shows the start time and title of the agenda item. Hover over the button that says "Schedule" to see the different view options. The "Expanded" option will show start and end times, room location, and session description, if there is one.
  • You can build your own schedule by creating a free account with SCHED by selecting "SIGN UP." Watch the "how-to" video to learn more about using Sched. 
  • PLEASE NOTE: Adding agenda items to your schedule through this app does not sign you up for a session. If an agenda item says "pre-registration required" or charges an additional fee, you need to add the item to your registration through the online registration system

View analytic
Tuesday, January 29 • 6:00pm - 9:00pm
(P67) Sensory Development and Navigation in Larval Grass Carp

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

AUTHORS. Amy E. George, Benjamin H. Stahlschmidt, Cayla L. Carlson – U.S. Geological Survey; Rafael O. Tinoco, Andres F. Prada – University of Illinois; Duane C. Chapman, U.S. Geological Survey

ABSTRACT. Sensory input and systems are critical for organisms to respond to their environment, allowing movement to suitable habitat and potential escape from predators.  While many aspects of grass carp ontogeny have been described, neurosensory development remains unclear.  Previous studies have shown that phototaxis occurs in larval grass carp, which was a basis for the successful deployment of light traps as a collection gear for larval carp.  However, other cues, such as chemotaxis, rheotaxis, and phonotaxis have not been studied for grass carp larvae, and it remains unclear when a response would begin to occur.  Using behavioral tests, we looked at phonotaxis and chemotaxis from initial gas bladder inflation to the development of the second gas bladder chamber (the period where larvae leave the mainstem river and move into nursery areas). Rheotaxis was examined from hatch through gas bladder inflation by quantifying orientation in a laboratory flume.  Grass carp larvae showed no preference for any chemosensory stimulus tested, and auditory stimuli elicited very little reaction except at frequencies above 1000hz and volumes up to 30 decibels higher than ambient noise.  Larvae showed a consistent orientation facing into the flow at most developmental stages, suggesting that rheotaxis may be the earliest developing sense and most critical for navigation. By knowing how and when different sensory systems develop in grass carp larvae, control measures may be developed that attract or deter larvae from specific areas.

Tuesday January 29, 2019 6:00pm - 9:00pm
Superior Ballroom CD