WWW.WAS.ORG • WORLD AQUACULTURE • SEPTEMBER 2014 57 (CONTINUED ON PAGE 62) Indian major carps and, to some extent, common carp and grass carp. During winter, fish had access to natural food sufficient for further growth after stocking in the reservoir. For growing tablefish, the species must have high market value, such as freshwater prawns, air-breathing species, seabass and, to some extent, carps and Pangasius sp. Small indigenous fish species (SIFS) with high market demand are also suitable. Local areas must be surveyed to assess the availability of seed and, if not available, they can be transported from West Bengal, where seed is available and costs less than any other part of India. Fry or fingerlings packed with pure oxygen can be transported for the 40-h journey from West Bengal. Because different size groups prevail among fry, they should be graded and a size of around 80 mm selected for stocking if table-fish culture is the objective. Cage culture makes it easy to harvest fingerlings for direct TABLE 1. Cage materials and their particulars. Name of cage material Particulars for raising fry to fingerling Particulars for raising fingerlings to table size Bamboos one battery of 8 cage with cage size one battery of 16 cages with 5 m x 3 m x 3 m cage size 4 m x 4 m x 3 m Galvanized iron 2 inches dia x 3.6 mm thickness 2 inches dia x 3.6 mm thickness, 60 feet, 20 nos. Floats 24 metal drums, 22 kg weight, 88 cm length, 64 metal drums, 22 kg weight, 88 cm length, 180 cm circumference, 58 cm dia 180 cm circumference, 58 cm dia PVC pipe 0.5 inches dia, 2.5 mm thickness, 260 feet Iron brackets 130 x 60 cm long and 5 cm dia are required to tie the drums on both sides Nut and bolts Galvanized iron, 120 x 18 cm long and 3 cm dia Galvanized iron, 100 x 18 cm long and 3 cm dia Sinkers 48 stones of 3-4 kg 48 stones of 3-4 kg Anchors large stones >40-50 kg large stones >40-50 kg Net HDPE, 1.5 mm mesh size HDPE, 15-24 mm mesh TABLE 2. Fingerlings to be selected for cage rearing to table size. Species Number of cages pcs/m3 Total number (including transport mortality) L. rohita 2 25-30 2000 C. carpio 2 25-30 2000 M. rosenbergii 2 15-20 1500 A. testudineus 2 50-70 5000 C. batrachus 2 30-40 3000 P. sutchi 5 30-35 6000 L. bata 1 50-100 2500 TOTAL 22,000 TABLE 3. Economics of fish seed raising in cages (per crop), in US$. Item/Particular Three crops/year (Cost/crop) Total fixed cost (% of total cost ) 79.81 (17.13) Total variable cost (% of total cost ) 385.99 (82.86) Total cost 465.80 Number of fingerlings produced 70.000 Cost of production/fingerling 0.01 Value of fingerlings @ Re 1/fingerling 1163.96 B:C Ratio 2.20 (CONTINUED ON PAGE 58)
RkJQdWJsaXNoZXIy MjExNDY=