study on the lethal effects of chlorine bleach disinfector soluble on big head carp (hypophthalmichthys nobilis) and gold fish (carassius auratus)

one of the pollutant materials in aquatic ecosystems is detergents that are inappropriate due to the increasing population in the world and in different ways to produce large amounts of groundwater and open surface water resources. these entry detergents to aquatic ecosystems can have adverse effects on aquatic life. so in current study acute toxicity of bleach on fry species of bighead carp and goldfish with average weight of 39±1 and 11±1 gr for detect of 50% mortality of population were studied in 96 hours. the analysis of data obtained from experiments was with spps software and probit analyzer. the study wason static base with o.e.c.d method in 4 days. based on the results, the acute toxicity of bighead carp and goldfish were 34.25 and 41.79 mg per liter respectively was calculated and then the maximum allowable concentration (mac value) of these toxins were 3.425 and 4.179 mg per liter respectively. based on the results, during exposure to bleach the bighead carp fish has less resistance in compare with goldfish.