BACTERIAL KIDNEY DISEASE (BKD) IN INDIAN MAJOR CARP FISHES, LABEO ROHITA (HAM.) AND CIRRHINUS MRIGALA (HAM.) -NATURAL OCCURRENCE AND ARTIFICIAL CHALLENGE
Abstract
Objective: To isolate and identify the pathogens of diseased Labeo rohita and Cirrhinus mrigala and to check their pathogencity.
Materials and Methods: An outbreak of Bacterial Kidney Disease (BKD) was recorded during the months of March, April, May, June, 2011 from Upputeru, near Akividu, West Godavari district, Andhra Pradesh, India. Â A total of 1,680 fishes were screened. Only two species namely, Labeo rohita and Cirrhinus mrigala were found infected with disease. No other species of fishes could be found suffering with disease. Standard microbiological methods were used for isolation and characterization of bacteria associated with diseased fishes.
Results: The infected fishes showed abnormal swimming behaviour, lethargic and swim lazily. The other clinical symptoms includes exophthalmia, skin becomes dark, open lesions with pus and hemorrhages on the body surface. In severe cases, lesions assumed the shape of ulcers. Internally, Kidney become swollen and showed discrete white areas which contained bacteria. In advance cases, kidney tissue was damaged severely. Bacteriological examinations of infected fishes indicate that the occurrence of Renibacterium salmoninarum in infected regions of skin and internal organs, particularly from kidneys.
Conclusion: Experimental infection trails revealed that the isolated bacterium was pathogenic to both species of fishes.
Key Words: Bacterial Kidney Disease, (BKD), Labeo rohita, Cirrhinus mrigala,
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