Acute toxicity of a Biopesticide Spinosad to benthic Oligochaete worm, Branchiura sowerbyi and the fry of Common Carp, Cyprinus carpio.
Journal Title: International Journal of Life Science - Year 2018, Vol 6, Issue 1
Abstract
Toxicity of a Biopesticide Spinosad to benthic Oligochaete worm, Branchiura sowerbyi and the fry of common carp, Cyprinus carpio along with their behavioural changes were evaluated in the present study. The 24, 48, 72 and 96 h LC50 values of Spinosad to Branchiura sowerbyi were 21.19, 12.40, 8.76 and 6.14 mg/l and to the fry of Cyprinus carpio were 5.03, 3.20, 2.16, 1.77 mg/l respectively. The mortality rate of B. sowerbyi and C. carpio showed significant variation (p<0.05) with the increasing concentrations at all exposure times. On the other hand, the mortality rate of B. sowerbyi and C. carpio also varied significantly (p<0.05) at all the doses with increasing exposure times (24, 48 and 72 and 96h). Excess mucous secretion, decreasing movements and decreasing clumping tendency were recorded in B. sowerbyi at higher concentrations. The excess mucous secretion with increasing concentration of toxicant and exposure time was recorded in the exposed fish. The treated fish showed faster movement and wide opening of mouth and gills at higher concentrations at 24 and 48h of exposure. At 72 and 96h of exposure the fish became sluggish and the movement was gradually reduced with increasing concentration. Similarly, the mouth and gill openings were reduced and were almost absent at the higher concentrations after 72h of exposure. The opercular movement of fish was increased significantly (p<0.05) at 24 and 48h but decreased significantly (p<0.05) at 72 and 96h.
Authors and Affiliations
Chandan Sarkar, Nimai Chandra Saha
Keywords
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