The influence of rearing temperatures on the toxicity of various environmental pollutants for killifish (Oryzias latipes)

Abstract

Eighty nine kinds of environmental pollutants were subjected to LC50 test by using small static system at low (10°C), medium (20°C) and high temperatures (30°C). Permissible volume of various dissolvents was determined at 30°C and 10% ether-dimethylsulfoxide solution was chosen as a suitable dissolvent for water-insoluble pollutants. Effects of temperature on the acute toxicity of various pollutants for fish were observed and categorized into four groups. First group : The acute toxicity for fish is not influenced by alterations in temperature. Second group : The acute toxicity for fish is the strongest at medium temperature (20°C). Third group : The acute toxicity for fish increased with a decrease in temperature. Fourth group : The acute toxicity for fish increased with an increase in temperature.