Evaluation of optimum level Nacl bath for Disinfection in figerlings of bighead (Aristichthys nobilis), common carp (Cyprinus carpio) and grass carp (Ctenopharyngodon idella) during transportation

This research was carried out in the August of 2011 in Shahid Maleki Warm Water Fish Culture Centre in Ahwaz, and that aim was to evaluation of optimum level Nacl bath for disinfection in figerlings of bighead carp (4.38±0.59 g) common carp (5.43±0.87 g) and grass carp (5.28±0.65 g) during transport. After 1h response to different salinity (1>, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30 ppt) we observed that salinity up to and include 18 ppt do not produce significant abnormal behavior and mortality in trial fishes. But salinities above of 20 ppt produced adverse effects on survival and behavior and normal appearance. These results demonstrate that using up to short-term (1h) Nacl bath (18ppt) to reduce the incidence of diseases, mortality and transportation could be suggested in our trial condition.