Robert V. Thurston,Glenn R. Phillips,Rosemarie C. Russo,Susan M. Hinkins
出处
期刊:Canadian Journal of Fisheries and Aquatic Sciences [Canadian Science Publishing] 日期:1981-08-01卷期号:38 (8): 983-988被引量:95
标识
DOI:10.1139/f81-133
摘要
The median lethal concentration (LC50) of aqueous ammonia at reduced dissolved oxygen (D.O.) concentrations was tested in acute toxicity tests with rainbow trout (Salmo gairdneri) fingerlings. Fifteen 96-h flow-through tests were conducted over the D.O. 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 (milligrams per litre un-ionized ammonia) and D.O. over the entire D.O. range tested; ammonia toxicity increased as D.O. decreased. Ammonia LC50 values were also computed for 12, 24, 48, and 72 h; the correlation with D.O. was greater the shorter the time period.Key words: ammonia toxicity, dissolved oxygen, rainbow trout, Salmo gairdneri