A study on the acute toxicity of Triazophos to Branchiura sowerbyi (Beddard, 1982) and their behavioural changes

Chandan Sarkar; Suman Bej; Nimai Chandra Saha

Volume : V, Issue : V, May - 2016

A study on the acute toxicity of Triazophos to Branchiura sowerbyi (Beddard, 1982) and their behavioural changes

Chandan Sarkar, Suman Bej, Nimai Chandra Saha

Abstract :

 The study was made to evaluate the acute toxic effects of Triazophos to benthic oligochaete worm, Branchiura sowerbyi along with the changes in their behaviour during the experiment. The 24, 48, 72 and 96 h LC50 values of Triazophos to Branchiura sowerbyi were 8.17, 7.07, 5.81 and 5.04mg/l respectively. The mortality rate of Branchiura sowerbyi varied significantly (p<0.05) with the increasing concentrations of the toxicant from 5.92, 5.60, 4.80 and 4.32 mg/l at 24, 48, 72 and 96h of exposure respectively. A significant variation (p<0.05) on the mortality rate was also recorded at each concentration ( from 5.60 mg/l and above) with the increasing exposure time (24, 48, 72 and 96h). The clumping tendency and movement of B. sowerbyi were decreased with the increasing concentration of the test chemical and exposure time. The mucous secretion of the worm was increased with the increasing concentration and the time of exposure.