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6027629 
Journal Article 
Effects of parasiticides on nitrification 
Dawe, DL; Gratzek, JB; Nemetz, TG 
1975 
32 
11 
2033-2037 
The effects on nitrification of chemicals commonly used for control and treatment of fish parasites were studied in recirculating systems containing channel catfish, with oyster shell as a buffer to provide stable pH values. Therapeutic levels of formalin, malachite green, formalin in combination with malachite green, copper sulphate, potassium permanganate, and sodium chloride did not affect nitrification, but 5 mg of methylene blue per litre resulted in cessation of nitrification for 16 days, indicated by a rapid rise in ammonia and stable nitrate concentrations. 
Department of agriculture & fisheries for scotland; Fish (see also individual groups listed below); Aqualine Abstracts