C. Bower, D. Turner
Sep 1, 1982
Citations
0
Influential Citations
11
Citations
Journal
Aquaculture
Abstract
Abstract The effects of seven commonly used chemotherapeutic agents on nitrification in closed seawater culture systems were evaluated by monitoring concentrations of total ammonia-nitrogen and nitrite-nitrogen before, during, and after treatment. Ammonia oxidation was inhibited by 8 mg/l methylene blue, 66.7 mg/l neomycin sulfate, 13.3 mg/l chloramphenicol, and 1.2 mg/l cupric sulfate (0.3 mg/l total copper). Nitrite oxidation was inhibited by neomycin sulfate and cupric sulfate. There were, however, inconsistencies between the responses of nitrifying bacteria in replicate aquaria to treatment with cupric sulfate and methylene blue. After total water replacement at the end of treatment, normal ammonia oxidation resumed in groups treated with chloramphenicol, but not in those treated with the other inhibitory compounds; both cupric sulfate and neomycin sulfate continued to inhibit nitrite oxidation after treatment. Gentamycin sulfate (5.3 mg/l), nifurpirinol (0.1 mg/l), and quinacrine hydrochloride (12 mg/l) did not produce biologically significant effects on nitrification.