Comparison of the profitability of different stocking densities of Litopenaeus vannamei post-larvae in earthen pond in Delavr shrimp site from Boushehr province

Comparison of profitability of different densities of Litopenaeus vannamei post larvae stocked in earthen ponds, in two 20-hectares shrimp farms base on semi-intensive and intensive culture system located in Delvar site in Bushehr province was performed, in 2019. The ponds with area of 1.2 and 2 ha. In semi-intensive farm was stocked with 17, 30 and 33 42 PL/m2, respectively. In intensive farm the pond was stocked 20, 30 and 40, 50 PL/m2 in the pond of 1.2 and 2 hectare, respectively. The result showed that the cost of feed (59-62%) was the highest cost and the cost of energy included the lowest cost in shrimp rearing. Production in semi-intensive system was more economical, despite of total biomass were produced in intensive system approximately 1.6 times more than semi-intensive. However, total cost of shrimp production was 29 thousand Rials/kg while the net profit was in semi-intensive and intensive culture system 19 and 18 thousand Rials/kg, respectively. According to the obtained results, the most profitable density is 33 and 40 pieces/m2 in 1.2 and 2 hectare, respectively.