Abstract
Abstract The rams-horn snail Planorbella trivolvis carries at least two important digenetic trematodes that infect propagated fish species in the southeastern United States. These snails are found in fish production ponds, and there are no proven chemical methods for eliminating them that would not also kill the fish. Application of an aqueous solution of 589 g of copper sulfate and 58.9 g of citric acid per 10 linear meters in a 2-m-wide swath along the pond shoreline produced an effective treatment. This would give an instantaneous treatment rate of about 59 ppm if the water in the 2-m swath averaged 0.5 m deep. In two separate trials, there was a significant difference in snail survival in the treated and sham-treated ponds. Average survival was 2.2% and 0% in the treatment ponds and 63.3% and 77.8% in the sham treatment ponds.
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