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Investigation of Diseases and Development of Strategics for Improved Health Management of Thai Pangas (pangasius Sutchi) Cultured in Rural Ponds in Mymensingh District.

M. A. R. Faruk
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

In order to examine disease and health status of Thai pangas, Pangasius sutchi (Syn. P. hypophthalmus) clinical, histopathological and bacteriological techniques were employed. In addition, to quantify the financial losses of farmer due to fish disease, questionnaire interview and participatory rural appraisal (PRA) tools were also used with selected farmers. A total of 100 fish farmers were interviewed and several PRA sessions were conducted in three upazilas in Mymensingh districts. This study indicated that there are economic losses of approximately 3.6% to farmers from diseases. These losses varied among different farm categories. The most prevalent diseases as reported by the farmers were red spot, followed by anal protrusion, tail and fin rot, pop eve, dropsy and gill rot. Other conditions like cotton wool type lesion, ulceration and while spot were also reported but with lower incidence. Fishes were found susceptible to disease during the winter months of the year. The clinical sings of diseases fish were quite similar to those reported by the farmers during the field survey. Four isolates of Aeromonas hydrophila were recovered from kidney and lesion of disease affected fish. Hemorrhage over the body especially near mouth and caudal region was noticed in the fishes associated with A. hydrophila infection, internally, kidney, liver and spleen were swollen and enlarged. The isolates varied with their pathogenicity. All the four isolates were sensitive to nitrofuratoin, cortimoxazole and tetracycline but were resistant to amoxycilline. General histopathological changes of different organs also studied. All the organs were found affected to some extent. Lamellar hypertrophy and hyperplasia, hemorrhage, telangiectasis, lamellar fusion, necrosis of lamellar epithelial cells, presence of parasites and their cysts were the major pathology of gills. Hemorrhage lesion, pyknotic nuclei and melanomacrophage centers (MMC) were found in the liver of fish. Major pathologies in kidney of fish included presence of MMC, necrotic and ruptured kidney tubules, severe haemopoietic necrosis and hemorrhage. The study also highlighted fish health management related problems and recommended a number of strategies for the improvement of existing health management practices.

Keywords: Diseases, Health management, Thai pangas, Fishes

Location: Mymensingh

Start Date: 01-07-2004

End Date: 30-06-2005

Program Area: Pest Management

Commodity: Pangus

Objectives:

1. To examine the diseases and health status of fishes; 2. To quantify the financial losses of farmer due to fish diseases; 3. To reduced the occurrence of diseases; 4. To find out the improvement of existing health management practices.

Methodology:

1. Materials 2. Questionnaire interview 3. Participatory Rural Appraisal (PRA) tools 4. Data analysis

Source of Information: BAU. Bangladesh Agricultural University Research Progress, Volume 15, Proceedings of the Workshop 15-16 January 2005, Bangladesh Agricultural University Research System (BAURES), Mymensingh. Bangladesh.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

This study indicated that there are economic losses of farmers from diseases. These losses varied from different farm categories. The study also indicated that fish health management related problems and recommended a number of strategies for the improvement of existing health management practices.

Knowledge Management: Report/Proceedings