Abstract The present study was performed to identify the tail rot disease causing bacterium in marine ornamental fish, Amphiprion sebae . Bacteria were isolated from the infected immune organs and tail region of A. sebae . Five different bacterial isolates (S1-S5) with different shape, size and colour were chosen for the infection study. The isolated strains were individually challenged with A. sebae at a constant dose of 1 × 10 7 CFU/fish. The virulent strain was found to be S-3, which showed maximum reproducing ability in A. sebae by causing typical tail rot disease and mortality. Furthermore, S-3 strain was identified as Vibrio parahaemolyticus by 16S rRNA gene sequencing (KF738005), biochemical analysis and amplification of tox R gene. Subsequently, extracellular products (ECPs) of V. parahaemolyticus were prepared by cellophane overlay method. The LD 50 value of V. parahaemolyticus and its ECP S were found to be 1 × 10 5 CFU and 5 μg/fish. The histology results revealed that V. parahaemolyticus and its ECP S are the major cause of tail rot disease in A. sebae .
Vibrio parahaemolyticus a causative bacterium for tail rot disease in ornamental fish, Amphiprion sebae
T. Marudhupandi,T. T. A. Kumar,Sanjeevi Prakash,J. Balamurugan,N. B. Dhayanithi
Published 2017 in Aquaculture Reports
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- Publication year
2017
- Venue
Aquaculture Reports
- Publication date
2017-11-01
- Fields of study
Biology, Environmental Science
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