Bacterial Gill Disease
نویسنده
چکیده
Bacterial gill disease (BGD) is a common external infection of hatcheryreared salmonids and occasionally of warm water species reared under intensive conditions. As defined by Wood (1974), the name of the disease describes the clinical signs of bacterial infections on the gills. The etiological agent of the disease is considered to be one or more species of filamentous bacteria including Flavobactwium sp. as most recently described by Wakabayashi et al. (1980). BGD is characterized by the presence of large numbers of filamentous bacteria on the gills accompanied by fusing and clubbing of the gill filaments. Acute or chronic forms of the disease may occur and acute outbreaks may involve daily mortality rates approaching 20% (Warren 1981). The onset of bacterial gill disease usually follows a deterioration of environmental conditions associated with overcrowding and increases in toxic metabolic waste products. According to Wood (1979), fish smaller than 90-100/lb are most susceptible to the disease. Successful treatment can only be accomplished through prompt therapy and alleviation of poor environmental conditions.
منابع مشابه
Histopathological observation of black gill disease in shrimp farm, Litopenaeus vannamei, in Boushehr province, Iran
The aim of this study was evaluate tissue lesions caused by black gill disease and its causes in 85-80 days old Litopenaeus vannamei with an average weight of 13-15 g located in the Delvar shrimp rearing site from Bushehr province. Primary and secondary gill lamella was necrosis, central axis were not arranged and gill lamella swelling, epithelial cell necrosis along with karyorrhexis and pykno...
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