• Anand Kumar

Freshwater catfish Clarias batrachus were exposed to lethal and sub lethal concentrations of fluoride and allow to evaluating its behavioural alterations. The fish were observed to exhibit prompt and erectic behavioural responses at extremely low concentration of fluoride compared to high concentration. The abnormal behaviour observed in fish exposed to high concentration were characterized by hyperactivities, erratic swimming, frequent surfacing followed by sinking, loss of equilibrium, loss of coloration and gradual onset of inactivity. The behavioural responses were dependent on concentrations; concentration dependent increased behavioural responses were reported. Fish exposed to lethal concentrations of fluoride exhibited high degree of behavioural alterations when compared with those in exposed with sub lethal concentrations. No significant behavioural changes were observed in the control group.

Freshwater Catfish, Clarias batrachus, fluoride toxicity, Bioassay, Behavioural responses, lethal responses, sublethal responses.

"Behavioural responses of freshwater Asian catfish, Clarias batrachus (Linn.) exposed to sodium fluoride.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 12, page no.1197-1201, December-2020, Available :http://www.jetir.org/papers/JETIR2012150.pdf

"Behavioural responses of freshwater Asian catfish, Clarias batrachus (Linn.) exposed to sodium fluoride.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 12, page no. pp1197-1201, December-2020, Available at : http://www.jetir.org/papers/JETIR2012150.pdf