Record Display for the EPA National Library Catalog


Main Title Acute Toxicity of Ammonia and Nitrite to Cutthroat Trout Fry.
Author Thurston, Robert V. ; Russo, Rosemarie C. ; Smith, Charlie E. ;
CORP Author Montana State Univ., Bozeman. Fisheries Bioassay Lab.;Environmental Research Lab.-Duluth, Monticello, MN.
Year Published 1981
Report Number EPA-R-800861; EPA-600/J-78-182;
Stock Number PB81-184731
Additional Subjects Toxicology ; Ammonia ; Nitrites ; Bioassay ; Fishes ; Concentration(Composition) ; Lethal dosage ; Tissues(Biology) ; Reprints ; Cutthroat trout ; Salmo clarki ; Toxic substances
Library Call Number Additional Info Location Last
NTIS  PB81-184731 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 10p
The toxicity of ammonia and of nitrite was tested on cutthroat trout (Salmo clarki) fry (1-3 g) for periods up to a month in eight laboratory flow-through bioassays. Median lethal concentration (LC50) values for ammonia (mg/liter un-ionized NH3) were 0.5-0.8 for 96 hours, and 0.3-0.6 for 36 days. Nitrite LC50 values (mg/liter NO2-N) were 0.5-0.6 for 96 hours, and 0.4 for 36 days. Tissues of fish exposed for 29 days to 0.34 mg/liter un-ionized ammonia evidenced degenerative changes in gills, kidneys, and livers. Cutthroat trout fry are comparable to rainbow trout (Salmo gairdneri) fry in their susceptibility to acute toxicity from aqueous ammonia and nitrite.