• S. Vijaya Lakshmi
• Dr Sravanthi Malempati
• Prof. K. Sambasiva Tilak

Acute toxicity experiments were conducted using static renewal bioassay 24 h, 48 h and 96 hours on the fresh water fish Catla catla (Hamilton) fry and fingerlings. LC50 values for 24 h - 380.18 mg / L, 48 h LC50 value - 337.28 mg/L and 96 h LC 50 value - 328.01 mg/L for fry. 24 h LC50 value for the fingerling stage 297.85 mg/L. The fingerling stage is found to be more sensitive than fry stage. For further studies only fingerling stage is selected. The toxicant exposed fish showed anomalous behaviour like surfacing phenomenon, rapid opercular movements and gulping, loss of equilibrium etc. The fish was exposed to 1/10th 24hr LC50, 24 hr LC50 and > 24 hr LC50 concentrations of toxicant sodium flouride to study the oxygen consumption rate for 12 hours and the concentrations were 29.683mg/ lit, 296.83mg/lit and 301.22 mg/lit respectively. The oxygen consumption was recorded at the end of each hour. During experimentation severe respiratory distress, rapid opercular movements leading to the higher amount of toxicant uptake increased mucous secretion decrease in the oxygen uptake efficiency and labored breathing was observed. It resulted in decreased oxygen consumption of the fish which indicates the fish is under toxicant stress. It also resulted behaviour demand for more energy which leads to the depletion of energy sources.

Behaviour, Catla catla, Toxicity, Sodium Flouride, Oxygen consumption.

"A STUDY ON ACUTE TOXICITY, OXYGEN CONSUMPTION AND BEHAVIOURAL CHANGES IN THE FRESH WATER FISH CATLA CATLA (HAMILTON) EXPOSED TO SODIUM FLUORIDE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 11, page no.99-106, November-2018, Available :http://www.jetir.org/papers/JETIR1811105.pdf

"A STUDY ON ACUTE TOXICITY, OXYGEN CONSUMPTION AND BEHAVIOURAL CHANGES IN THE FRESH WATER FISH CATLA CATLA (HAMILTON) EXPOSED TO SODIUM FLUORIDE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 11, page no. pp99-106, November-2018, Available at : http://www.jetir.org/papers/JETIR1811105.pdf