Acute toxicity of Butachlor to Caspian Kutum (Rutilus frisii KutumKamensky, 1991

Herbicides are used to control weeds and are usually targeted to processes and target sites that are specific to plants.Butachlor is an herbicide of the acetanilide class, which is used widely in agricultural fields. At the present study, lethalconcentration (LC50) of butachlor was calculated for Rutilus frisii Kutum. Samples weighted 4 ± 1 [mean ± SD] gr. Theexperiment were carried out in static condition and based on instructions of Organisation for Economic Co-operation andDevelopment (O.E.C.D) in 4 days under controlled water physicochemical factors with pH was 8-8.3, BOD 690 mg/l totalhardness 210 mgCaCo3 and temperature was 17 ± 0.1 °C. All fishes were acclimatized in 60×55×30 cm aquarium for 10 days.Treated aquariums with concentration ranges 0.11, 0.22, 0.33, 1, 1.66, 2.33, 3.33, 6.66, 13.33, 16.66 mg/l of butachlor andcontrol group (no toxic concentration) were performed. LC1, LC10, LC30, LC50, LC70, LC90 and LC99 were calculated for 24, 48,72 and 96 hours. LC50 96h butachlor for R. frisii Kutum was obtained 0.258 ppm. These findings suggest that butachlor ismoderately toxic and moderately irritating for this species. Clinical symptoms including irregular protrusion of the eyes andirregular swimming were observed

کلیدواژه ها:

Butachlor ، Caspian Kutum ، Acute toxicity