EFFECT OF COBALT CHLORIDE ON THE OXYGEN CONSUMPTION AND VENTILATION RATE OF A FRESHWATER FISH, CIRRHINUS MRIGALA(HAM.)

Kumari Rachana, Shahi R. N. P

Abstract: The fish Cirrhinus mrigala (Ham.) exposed to lethal and sublethal concentrations of cobalt chloride at selected periods showed a decrease in their ventilation rate up to 27.91% in lethal concentration at 240hr of exposure, while, in sublethal concentrations initially increased up to 23.95 & 27.91% at 96 and 240hr of exposure followed by a decline up to 24.70 and 12.94% at 960hr of exposure to 39.45 and 13.10 mg/l concentration respectively. The O2 uptake rate initially increased followed by a decline up to 54.47% at 240hr of exposure to lethal concentration (92.00 mg/l) & up to 28.80 & 10.65% in sublethal concentration at 960hr of exposure

Keywords: O2 uptake; ventilation rate: Cirrhinus mrigala; Cobalt chloride

DOI: https://doi.org/10.15623/ijret.2014.0302049