The survival of Atlantic salmon srnolts on exposure to constant concentrations of ammonia has been measured under laboratory conditions. At concentrations of dissolved oxygen close to the air-saturation value, the 24-h LC50 of un-ionised ammonia is 0.15 mg NH, 1 -I in fresh water (hardness 264 mg I-' as CaCO,) and 0.3 mg NH,I-l in 30% sea water; at concentrations of dissolved oxygen of 3.5 mg 1-i in fresh water and 3.1 mg 1 -I in 30% sea water, the 24-h LC50 is 0.09 mg NH, 1-1 and 0.12 mg NH, 1-1 respectively; for fish acclimated for 1 day to a concentration of ammonia close to the 24-h median for un-acclimated fish, the median is increased between 38 and 79%, depending on test conditions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.