STUDY ON THE MANAGEMENT PROTOCOL, GROWTH, YIELD AND ECONOMICS OF LITOPENAEUS VANNAMEI (BOONE, 1931) WITH VARIED STOCKING DENSITIES AND SALINITIES AT SPECIFIED COMMERCIAL CULTURE TANKS OF PURBA MEDINIPUR, WEST BENGAL, INDIA

White leg shrimp (Litopenaeus vannamei) production is now most demanding and high economic value culture practices through worldwide. The main objectives of the present studies is to evaluate growth, yield and economics of the species with varied stocking densities, salinity and management practices at commercially cultured six ponds with gradients of salinity, stocking density and survivability in study area of Purba Medinipur, West Bengal with different days of culture periods. During the crops harvest the final average body weight was 22.40gm, 23.00gm, 26.00gm, 20.25gm, 18.40gm & 16.10gm and yields (in Kg/Ha./Crop) are 9246.72, 8280.00, 5200.00, 8922.96, 8402.91 and 7545.68 respectively. The average daily gains (gm/day/Shrimp) are 0.235, 0.23, 0.24, 0.217, 0.204 & 0.178 and FCR value measured 1.25, 1.27, 1.38, 1.21, 1.05 & 1.04 respectively. The result showed the profit (in percentage value) is 42.84, 43.72, 32.82, 30.42, 19.09, 19.09 and 7.30 from pond P1 to P6 respectively. At the harvesting the highest growth rate observed at lowest final stocking (20/m 2) densities but higher yields observed at the final stocking density (SD) of around 40/m 2 though highest profit percentage at 35/m 2 of SD at the same unit area. The best management practice with good quality of seeds for culture periods of 100 ± 10 days fetching higher margin of profit. The shrimps are observed to grow well at the salinity range from 5.00ppt to 25.5 ppt. It is observed that with 80% survivability after sixty ± five days of culture (DOC) the average body weight (BW) was 10.00 ± 01gm/Shrimp. The optimum management of feed, water quality and disease control should be followed during management practices to get the higher profit in this shrimp culture