The effect of levamisole hydrochloride on survival of grass carp (Ctenopharyngodon idella)

 Abstract— Immunostimulants are the most valuable elements for the control of fish diseases in fish culture. Also, grass carp (Ctenopharyngodon idella) is one of the most contributors to warm water fish culture and hatcheries throughout the world.So , this study was conducted to determine the effects of levamisole hydrochlorideas as an immunostimulator agent on daily bath at the doses 3, 5 and 10 for 15 minutes in grass carp sac fry for 10 days. The results showed that the critical period and peak of mortality rate in ctenopharyngodon idella is between day 9 to 13 post hatching. In the present study the survival rate was 97.4 % in the control, 81.7% at the dose of 5 mg/l and 93.4% at the dos of 3. The results of this study demonstrate that levamisole was not capable of significantly (P< 0.05) reducing the mortality of grass carp larvae in rearing water.