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Main Title Effect of Fluctuating Exposures on the Acute Toxicity of Ammonia to Rainbow Trout (Salmo gairdneri) and Cutthroat Trout (S. clarki).
Author Thurston, Robert V. ; Chakoumakos, Charles ; Russo, Rosemarie C. ;
CORP Author Montana State Univ., Bozeman. Fisheries Bioassay Lab.;Environmental Research Lab., Duluth, MN.
Year Published 1981
Report Number EPA-600/J-81-345;
Stock Number PB82-128158
Additional Subjects Toxicology ; Ammonia ; Lethal dosage ; Bioassay ; Fishes ; Water pollution ; Exposures ; Nitrogen inorganic compounds ; Concentration(Composition) ; Reprints ; Salmo gairdneri ; Salmo clarki ; Water pollution effects(Animals)
Library Call Number Additional Info Location Last
NTIS  PB82-128158 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 7p
Acute toxicity bioassays in which fish were exposed to short-term cyclic fluctuations of ammonia were conducted on rainbow trout (Salmo gairdneri) and on cutthroat trout (S. clarki). Companion tests were also conducted in which test fish were subjected to ammonia at constant concentrations. The tests ranged in duration from 96 h to 4 weeks. Median lethal concentration (LC50) values in terms of both average and peak concentrations of ammonia for the fluctuating concentration tests were compared with LC50 values for the constant concentration (conventional) tests. Based on comparisons of total dose exposure, results showed that fish were more tolerant of constant concentrations of ammonia than of fluctuating concentrations. Fish subjected to fluctuating concentrations of ammonia at levels below those acutely toxic were subsequently better able to withstand exposure to higher fluctuating concentrations that fish not previously so acclimated.