Motile Aeromonas septicaemia among Tilapia nilotica (Sarotherodon niloticus) in upper Egypt.

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  • AMIN Nour El-Din
    Dept. Microbiol. & Parasitol., Fac. Vet. Med., Zagazig University
  • ABDALLAH I.S.
    Dept. Vet. Med., Fac. Vet. Med., Assiut University, Egypt
  • ELALLAWY T.
    Dept. Vet. Med., Fac. Vet. Med., Assiut University, Egypt
  • AHMED S.M.
    Dept. Vet. Med., Fac. Vet. Med., Assiut University, Egypt

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Other Title
  • エジプト北部におけるテラピア（Sarotherodon niloticus）の運動性エロモナス敗血症
  • エジプト北部におけるテラピア(Sarotherodon niloticus)の運動性エロモナス敗血症〔英文〕
  • エジプト ホクブ ニ オケル テラピア Sarotherodon niloti

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Abstract

A total of 25 T. nilotica (S. niloticus) fish showing clinical altrations were subjected to clinical, P. M., complete parasitologic and bacteriologic examinations. Results of clinical and post-mortem examinations revealed two forms of the disease: <BR>1. The first was characterized by redness of the skin, presence of haemorrhagic patches of various size distributed all over the body and fins, exophthalmia and anal prolapse with abdominal distention, which was considered as the acute septicaemic form of the disease.<BR>2. The second was characterized by roughness of the scales and their detachment from some parts of the body and formation of ulcers which were small at first, then became enlarged, have irregular shape, white centrally, surrounded by hyperemic zone and found on the lateral sides of the body. This was classified as chronic ulcerative form of the disease.<BR>Parasitologic examination of diseased fish revealed the presence of Ichthyophthirius multifilis protozoan which was considered as a stress factor.<BR>Bacteriologic examination of diseased fish revealed the presence of fourteen isolates of bacteria, morphologically and biochemically related to Aeromonas hydrophila.<BR>Biological experiments conducted on T. nilotica yearlings revealed that eight isolates of A.. hydrophila were highly virulent, three isolates were moderately virulent and the other three isolates were avirulent to the tested fish.<BR>The infection with A. hydrophila to T. nilotica was transmitted experimentally by I/P and I/M routes and not transmitted by scarification of the epidermis.<BR>Crowdness was a major factor for increasing mortalities among inoculated tilapias. Besides, T. nilotica have been proved to be a good model for studying the biological properties of fish pathogenic bacteria.

Journal

  • Fish Pathology

    Fish Pathology 20 (2/3), 93-97, 1985

    The Japanese Society of Fish Pathology

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