CULTURE OF CARPS IN PENS IN A WETLAND OF ASSAM - A CASE STUDY
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Authors
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B K GORAI
Northeastern Regional Centre, Central Inland Fisheries Research Institute, Guwahati - 781 006, Assam
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B C JHA
Central Inland Fisheries Research Institute, Barrackpore, Kolkata - 700 120
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D Nath
Central Inland Fisheries Research Institute, Barrackpore, Kolkata - 700 120
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M CHOUDHURY
Northeastern Regional Centre, Central Inland Fisheries Research Institute, Guwahati - 781 006, Assam
Abstract
Culture of carps in pen enclosures was carried out at three sites (Site-I, II and III) in Dek beel of Kamrup District, Assam. Local Bamboo variety was used as the basic material for pen construction. The pens were stocked with fingerlings Catla catla, Labeo rohita, Cirrhinus mrigala and L. gonius @ 36,000 ha-1 in a ratio of 3:2:2:1. The average stocking sizes of C. catla, L. rohita, C. mrigala and L. gonius were 5.4 cm (2.1 g), 5.2 cm (2.0 g), 4.8 cm (1.8 g) and 5.0 cm (1.8 g), respectively. Supplementary feed was given @ 5% body weight apart from the natural food available in the system. The pens were harvested after 88 (site I and II) and 97 (site III) days of rearing. The growth of C. catla, L. rohita, C. mrigala and L. gonius was 20-26 cm (125-265 g), 15-28 cm (60-295 g), 13-20 cm (30-110 g) and 15-19 cm (45-75 g), respectively. The abiotic factors of water and soil, studied during the period, were conducive for fish growth. The plankton population was relatively low. The fish yield was 1797, 1870 and 2659 kg ha-1 at site-I, II and III, respectively. The benefit cost ratio (B:C) of the pen culture was estimated at 1.7, thus economically viable.
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