Abstract
A study was carried out for a period for four months from January to April 2019 in eight fish farms at Mymensingh region of Bangladesh. The principal objectives were to study the health status of gulsha in four months from eight farms in Mymensingh region as well as month wise pathological changes of various organs of gulsha through clinical and histopathological observations. Clinical signs of fish were reddish lesion and mild injured in different parts of body, abrasion, whitish spots etc. Gills of fish showed more pathological changes than skin, muscle and liver. Histopathologically, gills of all fish species were more affected in Nuha Aqua Farm than other seven fish farms of Mymensingh in January and February. General gill pathology of the fishes was lamellar missing, haemorrhage and hypertrophy. Pathology of skin and muscle of the fishes from different farms included epidermal missing, necrosis, vacuum and loss of muscle. Fat bodies, necrosis, vacuum and haemorrhage were the common pathology of liver in the fishes from sampled farms of Mymensingh. Mainly fat bodies, vacuum and necrosis were found in Sharnalata Agro Fisheries, Relience Aqua Farm, Nuha Aqua Farm and Manju Aqua Farm. On the contrary, haemorrhage and necrosis were noticed in Chan Mia Fish Farm, Fish Seed Multiplication Farm; Maskanda and Setu Hatchery and Aquaculture in Tarakanda. In the months of March and April different organs of gulsha fish like gill, skin, muscle and liver were recorded almost normal structure from sampled fish farms. Fish were found to be affected during colder months of January and February. But, during March and April most of the fish were found normal and healthy. From field and laboratory observations it was revealed that the study area had potentiality for gulsha culture, although necessary measures need to be taken especially during winter season.
 Res. Agric., Livest. Fish.7(1): 139-151, April 2020
Highlights
Mystus cavasious locally known as ‘Gulsha’ has been drawing attention of fish farmers in Bangladesh due to its high market value, profitable culture, good taste (Saha et al, 1998)
Clinical Observations of M. cavasius in winter and summer season Reddish lesions at the ventral side of head region were recorded from fishes of Sharnalata Agro Fisheries in the month of February (Figure 2), whereas, severe reddish lesions and mild injury were observed at various parts of the body from fishes of Reliance Aqua Farm in the month of January (Figure 3)
In M. cavasius, lesions were reduced to small red patches in Setu Hatchery and Aquaculture, whereas, M. cavasius had rough skin, red spots, scale loss, weak body were seen from the farms during February and March
Summary
Mystus cavasious locally known as ‘Gulsha’ has been drawing attention of fish farmers in Bangladesh due to its high market value, profitable culture, good taste (Saha et al, 1998). For this reason, farmers of greater Mymensingh region are culturing these fishes to a large extent. Disease has become a major problem in fish production in culture system and wild condition in Bangladesh (Rahman and Chowdhury, 1996). Due to increased production, making a large profit at a short period of time and consumer demand, farmers culture most of the species including gulsha in a very high stocking density. Clinical signs and histopathology are important tools in diagnosing fish diseases. The progress of disease development as well as the cause of determination of death can be studied through this technique
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