Histopathological features of tilapias cultured in Nothern Vietnamese provinces naturally infected with Streptococcussp.

Received: 13-05-2014

Accepted: 30-05-2014

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Issue: Vol. 12 No. 3 (2014)

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CHĂN NUÔI – THÚ Y – THỦY SẢN

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Hoai, T., Son, N., Hoai, N., Phuong, N., & Hau, N. (2024). Histopathological features of tilapias cultured in Nothern Vietnamese provinces naturally infected with Streptococcussp. Vietnam Journal of Agricultural Sciences, 12(3), 360–371. http://testtapchi.vnua.edu.vn/index.php/vjasvn/article/view/95

Histopathological features of tilapias cultured in Nothern Vietnamese provinces naturally infected with Streptococcussp.

Truong Dinh Hoai (*) 1 , Nguyen Vu Son 2 , Nguyen Thi Hoai 3 , Nguyen Thi Mai Phuong 4 , Nguyen Thi Hau 3

  • 1 Khoa Chăn nuôi và Nuôi trồng thủy sản, Trường Đại học Nông nghiệp Hà Nội
  • 2 Khoa Thú y, Trường Đại học Nông nghiệp Hà Nội
  • 3 Khoa Chăn nuôi và NTTS
  • 4 Viện Nghiên cứu Nuôi trồng Thủy sản I

    • Keywords

    Histopathology, Tilapia, Streptococcus sp

    Abstract


    This study was implemented to clarify some histopathological characteristics of tilapia naturally infected with Streptococcus sp. cultured in freshwater ponds in Northern Vietnamese provinces during summer of 2013. Infected tilapias (n=46) showing symptoms of dermal haemorrhage and exophthalmia were collected at 9 fish farms in Hai Duong, Ha Noi and Ha Nam provinces and examined for both gross lesion and histopathological signs. Internally, the most consistent gross findings were haemorrhage and swelling of liver, spleen, kidney, heart and intestine as well as pale coloured liver and splenomegaly. Fish occasionally exhibited the accumulation of fluid within the abdominal cavity, epicarditis, and peritonitis. Histopathological examination revealed systemic bacterial dissemination and infiltration of bacteria-laden macrophages. The cornea was damaged and invaded by bacteria. Haemorrhage, granuloma formation and necrosis were detected in the infected areas of the liver, spleen, kidney and gills. Microscopical examination confirmed the presence of severe congestion in these ograns, especially spleen and kidney. Brain lesions were present occasionally. The results indicated that infected fish exhibited obvious and systemic histopathology.Adverse environmental factors during the hot season played a certain role in the formation of lesions and outbreak of this disease.

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