Acute Toxicity of Dichlorvos to Branchiura sowerbyi (Beddard, 1982)

Nimai Chandra Saha; Santosh Kumar Giri; Nishan Chatterjee; Surjyo Jyoti Biswas; Suman Bej

Volume : V, Issue : V, May - 2016

Acute Toxicity of Dichlorvos to Branchiura sowerbyi (Beddard, 1982)

Nimai Chandra Saha, Santosh Kumar Giri, Nishan Chatterjee, Surjyo Jyoti Biswas, Suman Bej

Abstract :

In the present study acute toxic effects of Dichlorvos to benthic oligochaete worm, Branchiura sowerbyi were evaluated. The 24, 48, 72 and 96 h LC50 values of Dichlorvos to B. sowerbyi were 11.83, 10.38, 8.24 and 7.15 mg/l respectively. The mortality rate of the B. sowerbyi varied significantly (p<0.05) with increasing concentration of test chemical at all exposure times. The mortality rate of the worm also varied significantly (p<0.05) at all the exposure times (24, 48 and 72 and 96h) at 7.5 mg/l of Dichlorvos and above. The worms exposed to test chemical gradually reduced their clumping tendency and movement with increasing concentrations at 7.5 mg/l and above during 72 and 96h of exposure times.