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Tuesday, January 26 • 10:20am - 10:40am
Channel Catfish Relative Weight (Wr) Within and Between River Basins in Western South Dakota

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AUTHORS: Erin Peterson*, South Dakota State University Department of Natural Resource Management; Stephen Jones, South Dakota State University Department of Natural Resource Management; Nels H. Troelstrup, Jr., South Dakota State University Department of Natural Resource Management; Katie N. Bertrand, South Dakota State University Department of Natural Resource Management; Brian Graeb, South Dakota State University Department of Natural Resource Management

ABSTRACT: The channel catfish Ictalurus punctatus is the most widespread sportfish in western South Dakota. Catfish condition is therefore important to managers and anglers. Channel catfish were collected from 11 sites on three western South Dakota rivers during the summer of 2015 as part of a large-scale diet study. Sites represented lower, middle, and upper reaches of each river. Overall condition (relative weight, Wr) was recorded from each fish over 280 mm total length (TL) collected in the Grande, Moreau, and White River basins. Mean condition was compared between basins and longitudinally within basins. We observed a significant interaction effect of basin and position using a two-way ANOVA (p=0.0005). Orthogonal contrasts revealed no significant differences in mean Wr between the three basins. There were also no significant longitudinal differences within the Grande River. However, within the Moreau River the mean Wr of the middle sites (mean Wr = 94.8) was higher than that of the lower and upper sites (mean Wr = 81.1 and 82.0, respectively). The lower site on the White River had a mean Wr of 71.8, which was significantly lower than the mean Wr of the middle and upper sites (mean Wr = 93.7 and 89.4, respectively). Based on these results, longitudinal position of sites has a greater effect on catfish condition than basin, though the effect is different in each basin. Additional sites will be sampled on these three rivers in 2016, as well as sites on the Cheyenne and Bad Rivers in the same region. The invertebrate community is also being quantified at each site where catfish were collected, and that community data will be compared to the invertebrate gut contents of the catfish to determine if the invertebrate prey base is related to catfish condition. These patterns can also be compared within and between basins.

Tuesday January 26, 2016 10:20am - 10:40am EST
Atrium