| چکیده انگلیسی مقاله |
Introduction: This study was conducted to monitor and evaluate the effective environmental and administrative risk factors in the occurrence of some specific viral diseases in the rainbow trout production of specific pathogens free (SPF) in Amol city.
Methods and Materials: For this purpose, physical, chemical, and microbial factors of input and output water of the farm, such as dissolved oxygen, temperature, pH, nitrite, nitrate, ammonium, ammonia, and total bacteria count for six months from May to October 2017 were measured according to the standard method. Further, the fish were sampled to check for the possibility of infection with IPN, IHN, and VHS viruses.
Results and Discussion: The results showed that the mean temperature, dissolved oxygen, pH, nitrite, nitrate, ammonium, ammonia, and total bacteria count of input water were 13.23±1.6 C°, 8.45±0.39 mg/L, 8.63±0.28, 0.226±0.275 mg/L, 1.86±0.72 mg/L, 0.003±0.002 mg/L, 0.009±0.01 mg/L and 320.33 colony unit per mL, respectively, and output water were 13.0±1.58 C°, 8.29±0.24 mg/L, 8.54±0.38, 0.267±0.325 mg/L, 2.18±0.8 mg/L, 0.055±0.07 mg/L, 0.048±0.058 mg/L, and 505.5 colony unit per mL, respectively. In Addition, virology experiments showed that the cultured fish were not infected by IPN, IHN, and VHS viruses.
Conclusion: According to the obtained data, chemical parameters including nitrite and ammonia amounts, and total bacteria count were assessed as risk factors in the farm. Overall, environmental and management parameters in the selected farm in Amol City, Mazandaran province of Iran, were assessed as suitable and acceptable for the culture of rainbow trout Specific Pathogens Free (SPF). |