Studies on association of various bacteria with epizootic ulcerative syndrome in freshwater fish species found in Dharmasagar Lake, Telangana, India

Abstract

The Epizootic Ulcerative Syndrome is one of the serious infections noticed in the finfish of Asia-Pacific during the last three decades. Different bacterial agents were isolated from EUS infected Channa striatus and Channa punctatus fishes from Dharmasagar Lake of Warangal, Telangana, India. Aeromonas hydrophila, Staphylococcus aureus, Pseudomonas aeruginosa and Salmonella salmonicida were most isolated groups. Isolates have been obtained and ability to induce dermal lesions in infectivity studies make bacteria is one of the likely primary aetiological agents that could be triggering the initiation to EUS. However, further investigations may be required to fully establish the role of these bacterial agents in the induction of EUS. Bacteria was observed as persistent infections in fishes evidenced by their presence in cell culture also require further investigations for their role in predisposing the freshwater fishes of C. striatus and C. punctatus. The environmental conditions were also found in fluctuation during the winter season the maximum EUS fishes affected. In the present study isolation of bacterial pathogens from infected fishes like Aeromonas hydrophila, Staphylococcus aureus, Pseudomonas aeruginosa and Salmonella salmonicida had shown its presence in bacterial load on gills and pancreas throughout the year and except in the summer months.