Comparison on lethal toxicity of butachlor poison on common carp (Cyprinus carpio) and Caspian roach (Rutilus kutum)

One of the most important factors that today is important with the risks associated of the growing industry and technology, is plant pesticides that can lead to the destruction of aquatic communities in the long times by entering aquatic ecosystems. So in current study acute toxicity of butachlor poison that is a very common at the agricultural plant was studied in 5-7 gr common carp and Caspian roach for detection of LC50 at 96 hour. Experiment was in static plan and based on the OECD standard conducted for 4 days; water physicochemical parameters including PH, dissolved oxygen and temperature were measured that they were in suitable ranges. Based on the results, acute toxicity of butachlor on carp and Caspian roach were 0.785 and 0.258 mg/l respectively and maximum allowable concentration MAC value were calculated as 0.078 and 0.025 mg/l respectively. According to the standard for determine of the toxicity of various pesticides, butachlor was considered more highly toxic for Caspian roach than common carp.