Histopathological investigation on the prevalence of gill necrosis inRainbow fish in the Ghezel farm in Arjan plain in Fars province

Consumption of fish meat, according to different reasons is preferred to the other domestics.Gillnecrosis syndrome is one of the most important diseases in aquaculture industry. Due to theimportance of fish husbandry in the supply of food resources of societies, the purpose of thepresent study is histopathological investigation on the prevalence of gill necrosis of the Rainbowfish in Ghezel farm.Method:In this study, ۲۰۰ pieces of Rainbow fish of Arjan plain in Kazeroon fished and kept in therubber case with ice powder and then was sent to the lab. In the laboratory of fish biology facultyof veterinary medicine, to measure the biometric properties, such as weight, length, etc as well asclinical reviews and after necropsy, and recording observations, fish gills were separated andmoved to ۱۰% formalin solution. Then with the preparation of histological sections of Gillsamples and hematocsilin eosin staining, microscopic study was done.Results:In ۶۴% of the samples, some microscopic signs were observed; and in ۳۶%; there were nopathology sign has been reported. The most important microscopic symptoms include ۲۵% ofcytoplasm membrane splinter, ۱۷% hypertonic of cytoplasm, ۹% nucleus hypertrophy, ۷%pyctosis, and ۶% is the connective tissue replacement.Discussion and conclusions:The most important factors that create the Gill necrosis due to the contents of the mentionedresults in summary are high density, stress, processed foods lacking in antioxidants and vitamins,along with large amounts of fat in the food expired food and irregular food program that havebeen caused acidosis in Gill.

Keywords:

Gill necrosis , Trout , Rainbow , Arjan Plain