Evaluation of Gill Net and Rotenone Sampling Techniques with Total Reservoir Drawdown

The effectiveness and selectivity of monofilament and multifilament gill netting and area rotenone sampling in a shallow, 15.3-ha impoundment were determined. Estimates of species present, relative abundance, length-frequency distributions and standing crops were determined by the sampling techniques and compared with total fish populations estimated by rotenone treatment of the entire impoundment. Each sampling device furnished close approximations of species present and relative abundance of dominant fishes, but gill netting was the most economical method of determining these two statistics. Area rotenone sampling provided the only adequate length-frequency data. Rotenoning surveys misrepresented the overall standing crop of fishes, but apparently furnished accurate standing crop estimates for sections of the impoundment sampled.

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