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Upper Midwest Environmental Sciences Center

Paddlefish Study Project

Project Cooperators

UMESC recognizes the La Crosse Fishery Resources Office (LFRO) in Onalaska, Wisconsin, a unit of the U.S. Fish and Wildlife Service, as a valued partner in the paddlefish study.
USFWS scientist with paddlefish  USFWS scientists weighing paddlefish

The LFRO has included Lake Pepin (Mississippi River Pool 4) in its study of paddlefish. The density of zooplankton (microscopic aquatic animals) in the lake and its possible influence on the behavior of paddlefish tagged in the Chippewa River has been a part of the study. Telemetry data indicated that most paddlefish radio-tagged in the Chippewa River moved downstream and entered Lake Pepin in late spring and remained there at a time when zooplankton populations typically attain maximum annual densities. Since paddlefish are planktivores, the Chippewa River fish are likely taking advantage of an abundant food resource following their earlier spawning period. Most of these fish return upstream in the Chippewa River by late June.

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Lake Pepin
Original figure and zooplankton data courtesy of
Minnesota Department of Natural Resources

The La Crosse Fishery Resources Office has additional information about paddlefish at the following URL: http://midwest.fws.gov/LaCrosseFisheries/projects/paddlefish.html.
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URL: http://www.umesc.usgs.gov/aquatic/fish/paddlefish/cooperators.html
Page Contact Information: Contacting the Upper Midwest Environmental Sciences Center
Page Last Modified: January 29, 2016