Molecular characterisation of Flavobacterium columnare associated with columnaris disease in freshwater fishes with emphasis on virulence and antibiotic resistance pattern


Abstract views: 133 / PDF downloads: 204

Authors

  • Ramesh Chandra Malick ICAR- Central Inland Fisheries Research Institute, Barrackpore, Kolkata.Regional Medical Research Centre, (ICMR), Bhubaneswar, Odisha.
  • Bhibhuti Bhusan Pal Microbiology Division, Regional Medical Research Centre, (ICMR),Bhubaneswar, Odisha
  • Asit Kumar Bera ICAR- Central Inland Fisheries Research Institute, Barrackpore, Kolkata.
  • Debasmita Mohanty ICAR- Central Inland Fisheries Research Institute, Barrackpore, Kolkata.
  • Basanta Kumar Das ICAR- Central Inland Fisheries Research Institute, Barrackpore, Kolkata.

https://doi.org/10.21077/ijf.2022.69.3.122636-11

Abstract

Flavobacterium columnare is a major aquaculture pathogen that causes columnaris disease. However, only very limited studies have been conducted on its virulence and resistance pattern. Three pathogenic bacterial isolates of F. columnare (CIFRI-RCM8, CFCCSL66 and CFCCO41) were obtained from diseased fish (Labeo rohita, L. catla and Clarias magur) of culture farms in Odisha and West Bengal, India. Clinical signs such as tail rot, skin ulcer and gill discolouration, as well as soft ulceration across the entire body, irrespective of the fish size were noticed. The virulence of the isolates was confirmed by a recursive in vitro experiments. The pathological changes in infected L. rohita were studied to confirm the pathogenicity. Considerable difference in virulence was noticed when fishes were challenged with different F. columnare strains. Among the isolates, CIFRI-RCM8 was the most virulent,whereas CFCCO41 was the least virulent one. All of the isolates were found to be multidrug-resistant showing resistance to cefuroxime, ampicillin, cephalothin, amoxyclav, cefalexin, ceftazidime, carbenicillin, trimethoprim, clindamycin, ticarcillin and penicillin-G. The study suggested that F. columnare is one of the most important etiological agents of disease in freshwater fishes for which appropriate management protocols needs to be developed.

Keywords: Antibiotics, Columnaris disease, Flavobacterium columnare, Molecular characterisation, Virulence

Author Biographies

  • Ramesh Chandra Malick, ICAR- Central Inland Fisheries Research Institute, Barrackpore, Kolkata.Regional Medical Research Centre, (ICMR), Bhubaneswar, Odisha.

    PhD Scholar,

    ICAR- Central Inland Fisheries Research Institute, Barrackpore, Kolkata.

    Microbiology Division, Regional Medical Research Centre, (ICMR),Bhubaneswar, Odisha

  • Bhibhuti Bhusan Pal, Microbiology Division, Regional Medical Research Centre, (ICMR),Bhubaneswar, Odisha
    Scientist - G, Microbiology Division, Regional Medical Research Centre, (ICMR),Bhubaneswar, Odisha
  • Asit Kumar Bera, ICAR- Central Inland Fisheries Research Institute, Barrackpore, Kolkata.
    Principal Scientist, ICAR- Central Inland Fisheries Research Institute, Barrackpore, Kolkata.
  • Debasmita Mohanty, ICAR- Central Inland Fisheries Research Institute, Barrackpore, Kolkata.
    Research Scholar, ICAR- Central Inland Fisheries Research Institute, Barrackpore, Kolkata.
  • Basanta Kumar Das, ICAR- Central Inland Fisheries Research Institute, Barrackpore, Kolkata.

    Director, ICAR- Central Inland Fisheries Research Institute, Barrackpore, Kolkata. 

     

Downloads

Submitted

2022-03-26

Published

2022-09-30

Issue

Section

Articles

How to Cite

Malick, R. C., Pal, B. B., Bera, A. K., Mohanty, D., & Das, B. K. (2022). Molecular characterisation of Flavobacterium columnare associated with columnaris disease in freshwater fishes with emphasis on virulence and antibiotic resistance pattern. Indian Journal of Fisheries, 69(3). https://doi.org/10.21077/ijf.2022.69.3.122636-11