IMPACT OF COPPER CYANIDE ON BEHAVIORAL CHANGES AND OXYGEN CONSUMPTION IN INDIAN MAJOR CARP CATLA CATLA (HAMILTON)

The toxicity of Metal-cyanide complex (copper cyanide) to the freshwater fish, Catla catla was studied using static bioassay method. The LC50 in 96 h was found to be 32 |ig/L. Behavioural changes when exposed to lethal concentration of copper cyanide showed increased opercular movement, increased surface behaviour, loss of equilibrium, change in body colour, increased secretion of mucus, irregular swimming activity, rapid jerk movement, ʹSʹ jerk, partial jerk and aggressiveness. Oxygen consumption was decreased in lethal concentration, but in sub lethal concentration decreased trend was improved and reached normal level at 21st day.