عنوان مقاله [English]
Water molds are assumed as one of the most important injurious microorganisms to fish egg production procedure, while, fungal infection can extensively destroy the fish eggs in hatcheries. The aim of this study was to evaluate antifungal effect of ozone and formalin on prevention of fungal infection on Persian sturgeon (Acipenser persicus) and increasing the hatching ratio. Effects of 0.03, 0.05 and 0.1 ppm of ozone and 1000 ppm of formalin were examined on hatching ratio. Egg disinfection by 1000 ppm formalin resulted in the greatest hatching ratio (74%) among all treatments. Among ozone treatments, 0.1 ppm showed the highest hatching ratio (71.4%) and there was not a significant difference among ozone treatments (P>0.05). Hatching ratio of the control group (without disinfectant) was 56.2%, and there was a significant difference (P<0.05) with other treatments. Ozone is preferred to formalin and can be considered as one of the favorable disinfectants, because of a lower concentration of ozone required to disinfect the culture medium, consequently, environmental pollution will be decreased. Comparison of both disinfectants showed that ozone almost revealed the equal effect on hatching ratio but with the proportion of 1:10000 to formalin (with the dose of 0.1 and 1000 ppm ozone and formalin, respectively).