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CHAPTER 4 Toxicity of Copper Sulfate and Potassium Permanganate to Rainbow Trout and Golden Alga Prymnesium parvum

The effects of copper sulfate and potassium permanganate on Prymnesium parvum cell density and ichthyotoxicity and on rainbow trout Oncorhynchus mykiss survival were investigated in 0.1-ha plastic-lined hatchery ponds. Treatments were 4 mg/L KMnO4, 1 mg Cu/L and 0.5 mg Cu/L as CuSO4, and untreated ponds which received no chemical addition. Treatments were applied once and rainbow trout were stocked at 5 fish/pond 4 days thereafter. The KMnO4 and 1 mg Cu/L treatments appeared to eradicate P. parvum and eliminate ichthyotoxin within 3 days after treatment application. The 0.5mg Cu/L did not appear effective to control cells or toxicity. P. parvum persisted in the control ponds throughout the study and sublethal levels of the toxin also existed in these ponds. The potassium permanganate demand of the toxic water was 2 mg/L. Rainbow trout survival did not significantly differ among treatment and control groups. The mortalities that occurred were caused by factors not measured in this study.