• A.Krishnamoorthi
• K.Moorthikumar
• M.Sellappan
• M.Ayyappan

Behavioural modification is one of the most sensitive indicators of environmental stress and may affect survival of an organism. Behaviour allows an organism to adjust to external and internal stimuli to meet the challenge of surviving in a changing environment and also the adaptations to environmental variables. In the present study, Tilapia exposed to cypermethrin exhibited disrupted school behaviour, localization to the bottom of test chamber and independency (spread out) in swimming, dullness, loss of equilibrium, stop of food intake, erratic and hysteric swimming. An increase in the number of mortalities, with an increase in concentration of the pesticide, was observed. The 96-hour LC50 value of synthetic pyrethroid cypermethrin was found to be 0 .07 μg/L.

Keywords: Stress, Behaviour, Environment, Mortalities and Pesticides

"Studies on Behavioural Response of freshwater fish, Tilapia (Oreochromis mossambicus) exposed to synthetic pyrethroid cypermethrin", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 1, page no.c743-c750, January-2022, Available :http://www.jetir.org/papers/JETIR2201295.pdf

"Studies on Behavioural Response of freshwater fish, Tilapia (Oreochromis mossambicus) exposed to synthetic pyrethroid cypermethrin", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 1, page no. ppc743-c750, January-2022, Available at : http://www.jetir.org/papers/JETIR2201295.pdf