Acute toxicity of endosulfan to the fish species Catla catla, Cirrhina mrigala and Labeo rohita
2013
Ilyas, R. (University of Agriculture, Faisalabad (Pakistan). Dept. of Zoology and Fisheries) | Javed, M. (University of Agriculture, Faisalabad (Pakistan). Dept. of Zoology and Fisheries)
Acute toxicity (96-h LC50 and lethal concentrations) of endosulfan to the fish viz. Catla catla, Cirrhina mirgala and Labeo rohita of 90-, 120- and 150- day age groups were determined in static water bioassay with three replications for each test dose. Water temperature (29-30 degree C), pH (7.5) and total hardness (300 mg L-1) were kept constant during acute toxicity trials. Both 96-h LC50 and lethal concentrations of endosulfan for all the three fish species varied significantly among all age groups. C. catla was more sensitive to endosulfan with the mean LC50 concentration of 0.98 mug L-1, followed by that of C. mrigala and L. rohita with the mean concentrations of 1.06 and 2.15 mug L-1, respectively. Mean lethal endosulfan concentrations of fish ranged between 1.60 mug L-1 (for C. catla) and 3.26 mug L-1 (for L. rohita) with significant differences. Fish age groups exhibited significant differences for their both LC50 and lethal concentrations. However, 90-days old fish were significantly more sensitive to endosulfan, while 150-days age fish were least sensitive. Thus, the sensitivity of fish to endosulfan was negatively correlated with age.
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