Abstract
Health status investigation of shing (Heteropneustes fossilis) was carried out through clinical and histopathological observations. During four months from January 2018 to April 2018. The data were collected from eight fish farms. Clinical signs of fish were physical deformity, reddish whitish lesions, abrasion and reduced mucus in the months of January and February from the investigated fish farms. Clinically fish were almost normal in the months of March and April. Histopathlogically observed pathological changes in gill were lamellar missing, splitted gill lamellae, hemorrhage, hypertrophy, vaccums and presence of parasites in January and February. In case of liver the examined fish had hemorrhage, vaccums, necrosis and fat bodies also in the months of January and February. Organs of the examined fishes were almost normal in the months of March and April. The purpose of the study was to determine the health status of farmed shing. The main objectives of the study were to observe clinical and histopathological changes in liver and gill of farmed shing (H. fossilis) at various fish farms of Mymensingh region and to determine the health status of the shing in the investigated months. From the present study, it was found that external organs like gill were more affected compared to internal organ like liver. From the present investigation, it was also observed that the fish were more affected in the months of January and February i.e. in winter season.
 Res. Agric., Livest. Fish.6(3): 445-455, December 2019
Highlights
Bangladesh has been ranked third in the world in terms of inland fish production in 2019 after ranking fifth last year, the country only trails behind China and India, ranked first and second, respectively
Clinical observations of H. fossilis in winter season In case of H. fossilis physical deformities and red whitish lesions were recorded from Nuha Aqua Farm and Setu Hatchery and Aquaculture (Figure 2 and 3) whereas deformity and severe lesions at lateral side of the body in the month of January were observed in fish of Fish Seed Multiplication Farm, Shabhuganj (Figure 6)
Similar results were reported by many authors like Ahmed et al (2004) who examined through clinical, parasitological and histopathological observations of three small indigenous fishes and found that many of the fishes were affected during the month of December and January
Summary
Bangladesh has been ranked third in the world in terms of inland fish production in 2019 after ranking fifth last year, the country only trails behind China and India, ranked first and second, respectively. Among the commercially important fishes of Bangladesh, Heteropneustes fossilis, locally known as "shing", is an important air breathing catfish in Bangladesh. It belongs to the family Heteropneustidae of the order Siluriformes. The species is recognized for its delicious taste and market value but is highly esteemed from nutritional and medicinal properties of view (Chakraborty and Nur, 2012). It contains high amount of iron (226 mg/100 g) and fairly high content of calcium compared to many other freshwater fishes (Saha and Guha, 1939). Being a lean fish it is very suitable for people to whom animal fats are undesirable (Rahman et al, 1982)
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