The exploitation status and spawning potential ratio of blue swimming crab (Portunus pelagicus) in North Natuna Sea, Indonesia

Abstract

Blue Swimming Crab (BSC) has been exploited in various areas, including the North Natuna Sea, because of its high selling value and potential as an export commodity. Overexploitation can threaten its sustainability. Therefore, information is needed regarding population status and spawning potential, particularly in the North Natuna Sea. This research was performed over three years, from April to December 2018, February to November 2019, and March to December 2020. A total of 4960 individuals of BSC samples ranged in size from 60 to 160 mm, with 115 mm being the most dominant. BSC exploitation in this water has reached E = 0.6, indicating that it has been overfished. The SPR value obtained was 19 percent. Even though there is high fishing pressure, the spawning potential of crabs is relatively high. Appropriate management policies are needed to maintain their spawning potential, including limiting the catchable size to a minimum of 60 grams and a policy of closing spawning locations.