*Corresponding author 71 Evaluating Anti-bacterial and anti-fungal effects of Eucalyptus globulus labill hydroalcoholic extract on the skin and gills of common carp fingerlings ( cyprinus carpio )

Necessity prevention of disease distribution as well as appropriate cure with low cost and side effects are very important. Among them, treatment with herbal medicine which has antibacterial and antifungal properties could be used as reliable method. For this aim, this study was carried out in Dr Keyvan fisheries sciences and marine technologies center which belonged to Lahijan Islamic Azad University, in order to assess effect of anti-bacterial and anti-fungal properties of Eucalyptus globulus labill extract on the skin and gill of common carp fingerlings ( cyprinus carpio ). In this experiment, short-term bath was used for controlling distribution of bacteria and fungus on the surface of skin and gill. The results revealed that, Eucalyptus globulus labill extract with concentration of 50, 100 and 150 mg/l in tiplicate with in 3weeks and 3 days consecutives which took long 30 minutes were tested. Among experimental treatments, colony forming unit (CFU) of fungus and bacteria had significant difference. But in concentration of 100 and 150 mg/l, extract had better efficiency for inhibition of fungus and bacteria pathogen in fingerlings
( cyprinus carpio )