Abstract:
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°C), pH (7.5) and total hardness (300 mg L-1) were kept constant during acute toxicity trials. Both96-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 µg L-1, followed by that of C. mrigala and L.rohita with the mean concentrations of 1.06 and 2.15 µg L-1, respectively. Mean lethal endosulfan concentrations of fishranged between 1.60 µg L-1 (for C. catla) and 3.26 µgL-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.
Page(s):
149-152
DOI:
DOI not available
Published:
Journal: International Journal of Agriculture and Biology, Volume: 15, Issue: 1, Year: 2013