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Health Status of a Snakehead (channa Punctatus) of Two Fish Markets in Mymensingh, Bangladesh

M.M. Hossain
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh 2202

G.U. Ahmed
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh 2202

Z. Tazri
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh 2202

M.A. Haque
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202

M.N. Akter
Department of Aquaculture, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200

Abstract/ Executive Summary:

An experiment was carried out for a period of six months during October 2008 to March 2009 to investigate the health status of a snakehead, Channa punctatus through clinical and histopathological technique. Fish were collected from two fish markets of Mymensingh district. Clinically and histopathologically, it was observed that fishes from both the markets were healthy in October and March but moderately affected in November and February. In the months of December and January, 7.5- 8% of the fishes were affected clinically and showing various clinical signs like, discolouration, deep ulcer, ill health, scale loss and rough skin. Histopathologically, in the month of December and January, major observed pathologies of skin and muscle were necrosis, vacuums, fungal granuloma and loss of dermis. Gills were affected having parasitic cysts, monogenetic trematode, clubbing, loss of primary and secondary gill lamellae, hemorrhage, necrosis and hypertrophy. Vacuoles, pyknosis, hepatic necrosis, hemorrhages and fungal granuloma were observed in liver. Renal pathology included necrosis and pyknosis of kidney tubules, hemorrhages, presence of bacterial colony and vacuoles. From present findings, it was found that, fishes from urban market were more affected with diseases than pre-urban market especially in the months of December and January when compared with other months. From overall observation, C. punctatus were severely affected by epizootic ulcerative syndrome (EUS), dactylogyrosis, protozoan and bacterial diseases during colder months of the year.

Keywords: Health status, Snakehead, EUS, Clinical signs, Histopathology

Location: Mymensingh district.

Start Date: 00-10-2008

End Date: 00-03-2009

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

To investigate health status of a snakehead C. punctatus from the fish markets of Mymensingh through clinical and histological measures.

Methodology:

The study was conducted for a period of six months from October 2008 to March 2009. Live snakeheads were collected fortnightly from two fish markets of Mymensingh such as pre-urban site- Kamal-Ranjit (KR) Market (located at BAU campus) and urban site- Shankipara Rail Crossing Market (located at Mymensingh town) by separate plastic container filled with water and immediately transported to the Fish Disease Laboratory of the Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh. The sampled fishes were clinically examined by naked eye and magnifying glass to record any external signs, injury and other abnormalities. Organs like skin and muscle, gill, liver and kidney were collected with the help of a sharp scalpel and forceps and fixed in 10% neutral buffered formalin for histopathological study. After 8 hours of fixation, the samples were trimmed in order to obtain a standard size of 1 cm³ (maximum) and placed in automatic tissue processor for dehydration, clearing and infiltration. The samples were then embedded, sectioned (5,um thickness) and stained with Haematoxylin and Eosin. Then the sections were mounted with canada balsam and covered by cover slips and examined under a compound microscope. Photomicrograph of the stained sections was obtained by using a photomicroscope. Record of structural variations and pathologies were done from the slides and photomicrographs.

Source of Information: Bangladesh J. Fish. Res., 13(1), 2009: 11-17

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Fishes from urban market were more affected with diseases than pre-urban market especially in the months of December and January when compared with other months. From overall observation, C. punctatus were severely affected by epizootic ulcerative syndrome (EUS), dactylogyrosis, protozoan and bacterial diseases during colder months of the year.

Knowledge Management: Journal