• The system consists of four major parts i.e., Breeding/ spawning pool, Hatching/ incubation pool, Egg/ spawn collection chamber and Overhead storage tank/ water supply system.\nBreeding/ Spawning Pool\n• The breeding pool is cylindrical in shape with 2.15 m diameter, 0.9 m height and 3,409 l capacity (operational capacity 2950 l). \n• The bottom of the pool is with uniform slope (1:22) towards outlet at the centre. The wall thickness varies 4.2 – 6.0 mm.\n• To provide water circulation/ flow, 5 numbers of 15 mm diameter rigid PVC elbows are fitted at the bottom of the sidewall at equal spacing. Five numbers of rigid PVC nipples 15 x 75 mm are fitted with elbows in the same direction. Asingle point water inlet of 25 mm diameter is also fitted at the sidewall of the bottom. \n• All the water inlet pipes are interconnected and fitted with individual full-way valves to control the flow of water. \n• One- shower is also provided at the top of the tank to sprinkle and aerate the water. \n• The water supply to the pool comes from the overhead tank placed at a minimum height of 3.3 m.\nHatching/ Incubation Pool \n• The pool is cylindrical in shape with 1.4 m diameter, 0.98 m height and 1,200 l net egg incubation volume (water volume of the pool 1275 l).\n• It consists of egg incubation chamber, FRP inner chamber, water supply system and accessories. \n• The FRP inner chamber of the tank is with 0.4 m diameter and 90 cm height, covered with nylon bolting cloth of 0.25 mm mesh to filter the excess water to the drain.\n• Six numbers of RPVC (15 mm diameter) duck-mouths are fitted at the bottom of the hatchery at 45 in between outer and inner chamber at equal distances to get required water flow for the eggs. \n• It also has drainage outlets fitted at the centre and at the outer chamber for draining and cleaning purposes.\n• The eggs hatch out in 14-18 h and remain in the pool for 72 h.\nEggs/ Spawn Collection Tank\n• This is a rectangular tank of size 1.0 x 0.5 x 0.5 m with capacity of 250 l. \n• Its wall thickness is 3 mm and it is reinforced with MS angle of 25 x 25 x 5 mm at all sides from the bottom in a height of 0.35 m. \n• The water level in the tank is maintained at a height of 0.45m (net water volume 225 l). \nTo drain the excess water, PVC pipe of 63 mm diameter and 150 mm length is fitted at a distance of 38.7 cm from the bottom.\n
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