Some Effects of Mirex on Two Warm-water Fishes

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Abstract
The fish were exposed either by feeding a mirex-treated diet, or by treating the holding ponds with a mirex formulation. Bluegills were used in a feeding experiment, where 3 different levels of mirex were incorporated into the diet and fed to fish held in plastic pools, and in the 1st pond-exposure experiment, in which the fish were held in earthen ponds treated once with a mirex-corncob grit formulation. A 3rd experiment used goldfish held in earthen ponds which also were treated once with the mirex-corncob grit formulation. In general, higher rates of exposure produced higher whole-body residues of mirex in the fish, and, except in bluegills form the lower-treatment ponds of the 1st contact experiment and in control fish, whole-body residues increased throughout the terms of these experiments. Soil, water, and vegetation samples from the 2 contact experiments contained relatively unchanging mirex concentrations. The gills and kidneys of mirex-exposed goldfish showed reactions beginning with the samples taken 56 days after treatment, and the numbers of these fish surviving until termination of this experiment were inversely related to treatment level. Growth of the bluegills in the highest treatment groups of the feeding experiment was adversely affected. Invertebrate populations seemed not to be affected by the mirex treatment in either of the earthen pond experiments.

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