Changes in relative abundance of adult walleye and egg density following the addition of walleye spawning habitat in a midwest irrigation reservoir

Authors

Jordan D. Katt, University of Nebraska at Kearney
Brian C. Peterson, University of Nebraska KearneyFollow
Keith D. Koupal, Nebraska Game and Parks CommissionFollow
Casey W. Schoenebeck, University of Nebraska at KearneyFollow
W. Wyatt Hoback, University of Nebraska at KearneyFollow

Document Type

Article

Date of this Version

3-2011

Citation

Published in the Journal of Freshwater Ecology, 26:1 (2011), pp 51-58.
DOI:10.1080/02705060.2011.553828

Comments

© 2011 Taylor & Francis. Used by Permission.

Abstract

Cobble substrate for walleye (Sander vitreus) spawning was added at Sherman Reservoir, Nebraska, in January 2008. We evaluated changes in relative adult walleye abundance and egg density in response to the cobble substrate and estimated site fidelity of adult walleye during the spawning seasons of 2007, 2008, and 2009. A 15% increase in electrofishing catch-per-unit-effort (CPUE) of adult walleye was observed on the cobble substrate the first season it was available (2008), but a 5% decrease in electrofishing CPUE was observed the second season (2009) compared to the 2007 season. While gill nets were not run during the first season the cobble was available, a 113% increase in gill net CPUE was observed the second season. During the first season the cobble was available, a 215% increase in egg density was observed, but no increase in egg density was found in the second season. Site fidelity of adult walleye within a spawning season was 94% and was 81% between seasons. These results indicate that the addition of the cobble substrate increased the relative abundance of adult walleye and density of eggs on the cobble substrate.