Abstract
Copper has been used for many years as a chemical tool in freshwater farm ponds and aquaculture operations. It is both an effective algicide and a parasite treatment. The problem with the use of copper is that there is a thin line that separates effective treatment levels from overdoses, which can kill fish. This fact sheet is designed to explain when copper is used, how it is used, and some precautions to take before using it. First published in 1989.
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