The harvest was performed from four HDPE cages of six metre diameter and four metre depth. The cages were moored in the sea using 14 mm-long linked alloy steel chain and concrete iron blocks.
According to CMFRI scientists, around 1,000 grouper advanced fry measuring 3 cm in length were stocked in a cage in May 2017.
The fish were fed pellet form at 10% of biomass twice a day until they grew to 100 grams in three months. The fish were fed later with low-value fish at five to seven of biomass twice a day. Net and cage frame cleaning and net exchange were done at monthly intervals. After 15 months, the fish reached on an average 2.5 kg. With survival of more than 95%, the yield obtained from one cage was 2.41 tonnes. They were sold to the State Fisheries Development Corporation, West Bengal, at prices in excess of ₹300 per kg.
Around 3,000 numbers of Indian pompano advanced fry measuring 5.25 cm and 2.5 g were stocked in one cage in the month of August, 2017. The fish were fed in pellet form feed at 10% of biomass twice a day until the fish reached 280 grams in six months. Later, the stock of Indian pompano was segregated into three cages and was fed with pellet-type feed at five to seven of biomass twice a day. Net and cage frame cleaning and net exchange was performed at monthly intervals. After 12 months, the fish reached on an average 0.75 kg in weight.
With survival of more than 95%, the yield obtained from three cages was 2.1 tonnes. The fish have been sold to the State Fisheries Development Corporation, West Bengal, at prices in excess of ₹320 per kg.
