Preliminary Epidemiological Studies on Epizootic Ulcerative Syndrome (EUS) in Freshwater Fishes of Assam

Authors

  • Devashish Kar  Department of Life Science and Bioinformatics, Assam (Central) University, Silchar, Assam, India
  • Ratnabir Singha  Department of Life Science and Bioinformatics, Assam (Central) University, Silchar, Assam, India
  • Biplab Kumar Das  Department of Life Science and Bioinformatics, Assam (Central) University, Silchar, Assam, India
  • Riji John  Fisheries College and Research Institute, Tamil Nadu Fisheries University, Thoothukudi, Tamil Nadu, India
  • Rosalind George  Fisheries College and Research Institute, Tamil Nadu Fisheries University, Thoothukudi, Tamil Nadu, India
  • M. Mansoor  Fisheries College and Research Institute, Tamil Nadu Fisheries University, Thoothukudi, Tamil Nadu, India
  • Mahesh Selva  Fisheries College and Research Institute, Tamil Nadu Fisheries University, Thoothukudi, Tamil Nadu, India

Keywords:

Fish, diseases, EUS, Epidemiology, Cachar, Assam, India.

Abstract

Preliminary epidemiological investigation was carried out to examine the status of Epizootic Ulcerative Syndrome among the freshwater (FW) fishes of Cachar district in Assam during the period from January 2013 to May 2015. Our study revealed fluctuation in the intensity of the disease in relation to species affected. A total of c 581 EUS-affected fishes were recorded during the present study period. The temperature of air and water of the wetlands were recorded as 17o C to 35o C and 19o C to 28o C respectively. pH was recorded as 5.5 to 7.0. The most prevalent symptoms of EUS disease, as reported by the farmers, were ulceration on the skin followed by tail and fin rot. The Case Fatality Ratio (CFR) has been calculated species wise and has been found to be high among Cirrhinus mrigala (83.72 %), followed by Puntius ticto (75 %), Channa marulius (70 %), Mastacembelus armatus 69.23 %), Anabas testudineus  (53.85 %), and, so on.  Further, the Specific Death Rate (SDR) due to EUS was found to be 57.89 %. Communicative nature of EUS revealed variation in time gap between fish and infection in different species. Financial loss to farmers due to fish disease was colossal, as was revealed through interviewing the Fish farmers.

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Devashish Kar, Ratnabir Singha, Biplab Kumar Das, Riji John, Rosalind George, M. Mansoor, Mahesh Selva, " Preliminary Epidemiological Studies on Epizootic Ulcerative Syndrome (EUS) in Freshwater Fishes of Assam, International Journal of Scientific Research in Science, Engineering and Technology(IJSRSET), Print ISSN : 2395-1990, Online ISSN : 2394-4099, Volume 1, Issue 5, pp.256-263, September-October-2015.