Товарная аквакультура и искусственное воспроизводство гидробионтов UDC 639.371.5.03/.06:639.3(549.3) Dulon Roy LARGE SCALE FISH PRODUCTION THOUGH CARP POLYCULTURE SYSTEM IN A FISH FARM IN BANGLADESH Abstract. <...> The aim of the study is to obtain maximum fish production per unit area within semiintensive culture system. <...> The duration of rearing Rui (Labeo rohita), Catla (Catla catla), Mrigal (Cirrhinus mrigala), Common carp (Cyprinus carpio), Grass carp (Ctenopharyngodon idella) and Silver carp (Hypophthalmichthys molitrix) in 5 ponds (0.15 ha to 0.18 ha in size and water depth 2-2.5 m) was 8 months (March-October). <...> All the aquatic vegetation was removed, all unwanted fish were destroyed with phostoxin. <...> The total volume of fish production (25 877.78 kg/ha) was higher than the average fish culture procedures followed in the rural areas of Bangladesh. <...> Rui (1254.11 kg/ha, pond area 0.18 ha) and Mrigal (1222.22 kg/ha, pond area 0.15 ha) dominated by this parameter despite the highest values of stocking density. <...> Bangladesh is one of the world leading inland fisheries producer with a production of 1 646 819 tonnes during 2003–2004, with marine catch total of 455 601 tonnes and a total production from aquaculture of 914 752 tonnes during 2003–2004. <...> Bangladesh's total fish production for the year totaled above 2.1 million tonnes [1]. <...> Food and Agriculture Organization of the United Nations (FAO) [2] ranked Bangladesh as sixth largest aquaculture producing country with its estimated production of 856 956 tonnes in 2003 [2]. <...> Aquaculture accounted for about 43.5% of the total fish production during 2003–2004, with inland open water fisheries contributed 34.8% [1]. <...> Polyculture comprises different compatible species of fish of different trophic and spatial niches are raised together in the same pond to utilize all sorts of natural food available in the pond. <...> In Bangladesh, aquaculture production systems are mainly extensive and extended extensive, with some semi-intensive and in very few cases intensive systems. <...> Although the culture fishery contributes over 55% of inland fish production, it covers only about 1l% of the total inland water resources. <...> As most <...>