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Treatment of channel catfish (Ictalurus punctatus) production ponds with biweekly applications of 0.84 kg/hectare copper sulfate was ineffective in reducing phytoplankton density. Three periodic applications of simazine totaling 1.3 mg/liter drastically reduced phytoplankton density. However, extended periods of low dissolved oxygen concentrations following simazine applications resulted in decreased fish yields and poor conversion ratios as compared to control ponds.
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Tucker et al. (1978) studied this question.
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