Increased Toxicity of Ammonia to Rainbow Trout (Salmo gairdneri) Resulting from Reduced Concentrations of Dissolved Oxygen
- 1 August 1981
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Fisheries and Aquatic Sciences
- Vol. 38 (8), 983-988
- https://doi.org/10.1139/f81-133
Abstract
LC50 of aqueous ammonia at reduced dissolved O2 (DO) concentrations was tested in acute toxicity tests with rainbow trout (S. gairdneri) fingerlings using fifteen 96-h flow-through tests over the DO range 2.6-8.6 mg/l, the former concentration being the lowest at which control fish survived. There was a positive linear correlation between LC50 (mg/l unionized ammonia) and DO over the entire DO range tested; ammonia toxicity increased as DO decreased. Ammonia LC50 values were also computed for 12, 24, 48 and 72 h. The correlation with DO was greater with the shorter time period.Keywords
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