Exotic fish species, specially Telapia (Oreochromis mossambicus) and Thai Koi (Anabas testudenius) are becoming popular and comparatively high priced in Bangladesh. As food, they are consider highly nourishing, palatable and have reputation as tasty fish. They are well preferred because of thick muscle content and high protein value and in great demand in many parts of India, Thailand and Bangladesh. Telapia as well as Koi fish are well adapted to adverse ecological conditions obtaining swamps, marshes and derelict ponds. These water bodies are mostly shallow and characterized by heavy silt with decaying vegetation and organic load coupled will poor nutrient release.
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