A study on acute toxicity of an insecticide Triazophos on Zooplankton Cyclops viridis (Jurine, 1820) along with the changes in their behaviour

Chandan Sarkar; Nimai Chandra Saha

Volume : V, Issue : XI, November - 2016

A study on acute toxicity of an insecticide Triazophos on Zooplankton Cyclops viridis (Jurine, 1820) along with the changes in their behaviour

Chandan Sarkar, Nimai Chandra Saha

Abstract :

The objective of the present work was to find out the acute toxic effects of Triazophos to Zooplankton, Cyclops viridis along with the changes in their behaviour during the study. The 24, 48, 72 and 96 h LC50 values of Triazophos to Cyclops viridis were 0.57, 0.27, 0.16 and 0.13 ng/l respectively. The mortality rate of Cyclops viridis varied significantly (p<0.05) at all treatments irrespective of exposure times (24, 48, 72 and 96h). A significant variation (p<0.05) in the rate of mortality of C. viridis was also recorded at all exposure times at all the doses. The swimming rate, hopping frequency and angular turns and bends were initially increased with the increasing concentrations of the toxicant upto 48h of exposure but they were decreased at 72 and 96h