Green Global
Foundation   Journal
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SEASONAL VARIATIONS OF PHYSICOCHEMICAL PARAMETERS AND INCIDENCE OF FISH DISEASES IN FRESHWATER AQUACULTURE OF BANGLADESH (Pages : 67 - 74)

The monthly variations of physicochemical parameters and incidence of fish diseases in some selected freshwater cultured ponds were studied in three zones (Mymensingh, Rajshahi and Sylhet) of Bangladesh during July 2010 to June 2013. The highest values for water temperature, pH, dissolved oxygen (DO), alkalinity, total hardness and ammonia in fish cultured ponds were 30.7°C (August '10) in Mymensingh, 8.8 (July '11) in Rajshahi, 6.6 ppm (August '12) in Sylhet, 170 ppm (January '11) in Mymensingh, 120 ppm (January '11) in Mymensingh and 0.065 ppm (February '12) in Rajshahi, respectively. In the study area, the physicochemical parameters have more or less significant combined effect on the deterioration of water quality as well as outbreak of fish diseases. The highest incidence of fish diseases was found 44.36% (January' 11) in Rajshahi followed by 41.82% (December '12) in Sylhet and 41.00% (February' 11) in Mymensingh zone. The lowest incidence of fish diseases was 4.64% (June' 13) in Sylhet, 5.55% (July' 11) in Rajshahi and 7.10% (July' 10) in Mymensingh zone. Among the diseases, Trichodiniasis and Dactylogyrosis were the most prevalent diseases recorded throughout the year following Dropsy, Whirling and Mouth fungus were found as least dominant diseases in the study areas.Download