Some Practical Considerations in the Use of Rotenone in Fisheries Research

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Abstract
Of the several rotenone-containing preparations available for reclaiming bodies of water, our experience has shown that powdered derris root (5% rotenone) and emulsifiable rotenone (5% rotenone) are the most satisfactory. The method of application of rotenone should be modified to fit the particular area to be treated. The percentage of fish recovered following the treatment of a body of water with rotenone depends largely on the abundance of emergent and submerged vegetation present along the shoreline and the length of time spent in recovering fish. Fish lose weight after death. Green sunfish in one pond lost 18.8% of their fresh wt. during the 1st 3 days after death. Largemouth bass yearlings lost only 7.5% in the same period. Largemouth bass fingerlings lost 11.75% the first day and another 9.85% by noon of the 2d day. From then on they continued to lose weight. Black bullhead fingerlings lost 16.77% of their fresh weight in one day. Predation of small dying fish by larger fish during the treatment and shortly afterward alters the true picture of the wts. of the individual spp.

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