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Tuesday, January 30 • 6:00pm - 9:00pm
Poster Display. Fish Species Habitat and Hydrology Preferences in Pool 12 of the Upper Mississippi River

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AUTHORS: Daniel W. Pike, Jacob A. Wolfe, David E. Koch - University of Dubuque, Iowa

ABSTRACT: Freshwater fish play an important role in the ecology of the Mississippi River. Studying the effects of hydrological changes on fish populations can help us better understand how to manage fish populations. Fish capture data has been monitored via by-catch from a long-term turtle project that has been conducted in near 9-Mile Island in Pool 12 of the Upper Mississippi River. In 2017 eight hoop nets were deployed in four pairs with a lead net between each pair.  Two pairs were set in lentic backwater and two were set in lotic areas of the river. Capture data was compared to hydrologic data recorded by the USGS at a site 11km upstream. Regardless of water level, abundance of Longnose Gar (Lepisosteus osseus), Shortnose Gar (Lepisosteus platostomus), Northern Pike (Esox Lucius), Bluegill (Lepomis macrochirus), Green Sunfish (Lepomis cyanellus), and White Crappies (Pomoxis annularis) was higher in the backwater sites, and White Bass (Morone chrysops) and Flathead Catfish (Pylodictis olivaris) had higher abundance in channel sites. Preliminary observations suggest that as the water level drops, the number of Longnose and Shortnose Gar decreased in the backwater sites and the number of Northern Pike tended to increase.

Tuesday January 30, 2018 6:00pm - 9:00pm CST
Ballroom C & Foyer

Attendees (2)