Abstract

Abdolreza Jahanbakhshi*, Aliakbar Hedayati and Fatemeh Ghaderi Ramazi

The acute toxicity of hypochlorite sodium to four species of freshwater fishes was investigated in laboratory tests. All fishes were exposed to hypochlorite sodium at several selected concentrations and number of mortality was registered after 24, 48, 72 and 96 h. LC50 values were determined with probite analysis. According to the results LC50 96 h hypochlorite sodium were 42.9 ± 0.20, 33.2 ± 0.36, 22.7 ± 0.22, 41.7 ± 0.19 for common carp, silver carp, roach and gold fish respectively. According to the results procure in the present experiment; hypochlorite sodium had more toxicity to roach compared to silver carp, common carp and gold fish.