Abstract
The blue swimming crab (BSC), Portunus pelagicus (Linnaeus 1758), inhabits coastal areas of Southeast and East Asia, and is one of high fisheries commodities with an export value for Indonesia and an increasing global market demand, annually. However, the data of genetic diversity and their spatial connectivity of populations in Indonesia are not yet known, even when it is important to inform stock unit management and sustainable use. This study aimed to determine the genetic diversity and differentiation of blue swimming crabs across Indonesian populations in different Fishery Management Area (FMA), and their spatial genetic connectivity, as well as to deliver implications for sustainable fishery. A total of 297 individuals were collected and amplified using cytochrome oxidase I mitochondrial DNA. This study has showed the highest values for haplotype and nucleotide diversity in the eastern part of Indonesia, where exploitation is relatively low. Significant genetic differentiation between populations (FST = 0.954; p < 0.001) and the fisheries management areas (FST = 0.964; p < 0.001) were revealed. Low spatial connectivity was observed between populations in a distance of at least more than 60 kilometers. This study suggests that BSC populations in Indonesia, likely have several stock units, and preferably different fisheries management plans and actions across the region thoroughly and simultaneously. This would be effective for management and their sustainable conservation.
Highlights
The blue swimming crab (Portunus pelagicus Linnaeus, 1758) inhabits coastal waters of Southeast and East Asia [1]
The amount of genetic diversity observed in the presented study sites may be due to fishing pressure regularly and crab are in a stage of self—environmental adaptation, with a population that is still available in nature, but are vulnerable to rapid decline or extinction
This case seemed to happen in the area of Southeast Sulawesi, where the fishing pressures is high, and some areas in the north coast of Java, except Madura, where still a high genetic diversity can be found
Summary
The blue swimming crab (Portunus pelagicus Linnaeus, 1758) inhabits coastal waters of Southeast and East Asia [1]. The spatial connectivity of blue swimming crabs is influenced by their. Genetic population subdivision of the blue swimming crab across Indonesia (APRI) and the Laboratory of Marine Biodiversity and Biosystematics Department of Marine Sciences and Technology Faculty of Fisheries and Marine Science, IPB University. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript
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