Sublethal effect of Ethephon pesticide on carcass composition of rosy barb, Puntius conchonius (Hamilton, 1822)
Sana KM Patel and ST Indulkar
Experiment on bioassay was undertaken to find out the toxic effect of ethephon on proximate composition of rosy barb (Puntius conchonius). The 96 hrs LC50 of ethephon for rosy barb fish was found to be 64.034 mgl-1. During sublethal exposures for a period of 28 days, two concentrations were selected i.e. 1/10th and 1/5th of LC50 such as of 12.81 and 6.40 mgl-1. At the end of exposure periods of 7th, 14th, 21st and 28th days i.e., after every seven days, ten fingerlings were sacrificed for carcass biochemical analysis such as moisture content, crude protein, crude fat, total ash content and carbohydrate. Crude protein significantly decreased from 60.08 ±0.05 on 1st day to 53.38±0.05 on 28th day; crude fat significantly decreased from 10.07 ± 0.05 on 1st day to 8.08±0.02 on 28th day of the study. Whereas, carbohydrate increased from 10.06±0.02 on 1st day to 12.02±0.02 on 28th day, ash content increased significantly from 9.94 ±0.05 on 1st day to 11.08±0.01 on 28th day and moisture content also increased from 9.79 ± 0.03 to on 1st day to 12.30±0.02 on 28th day respectively. All the estimated parameters showed significant alteration during exposure period indicated toxicity of ethephon pesticide to the rosy barb fish.