Evaluation of bioelectrical impedance analysis methods for use on Channel Catfish
Type of DegreeMaster's Thesis
Fisheries and Allied Aquacultures
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Assessment of body composition is an accurate measure of condition. This study evaluates bioelectrical impedance analysis (BIA) methods for Channel Catfish Ictalurus punctatus. BIA shows promise as a quick, inexpensive, and non-lethal technique to estimate body composition. Models were developed by correlating BIA measures to total body water (TBW). The seven anatomical locations where measures were taken had a significant influence on predictive ability of models. Dorsal-lateral measurements were highly correlated with volumetric resistance in series and had the highest predictive ability for TBW (R2=0.9651 and 0.9816). TBW converted to percent dry mass (%DM) was used as a proxy for fat and protein. Significant relations were found between %DM and percent fat (R2=0.8319) as well as percent protein (R2=0.7033). Temperature had a significant negative effect on BIA measures. Measures of wet weight and total length also had significant relations to TBW, therefore, further analysis of BIA models is necessary.