Abstract
Exploitation rate of the blue swimming crab (BSC) in Indonesian Fisheries Management Area (FMA) 712 is over-optimum level in 2016. Stocks concern in sustainable management is needed as an effort to maintain its availability. The objective of this study is to identify the stock unit of BSC based on Truss Network Analysis (TNA) of morphometric characters in FMA 712. The BSC was collect in five different locations, i.e. East Lampung, Lancang Island, Cirebon, Rembang, and Southern Madura. Measurements on TNA were carried out at 14 landmark points with 29 characters in carapace to analyze its morphometric characters. The cluster analysis showed that TNA method revealed two stocks units of BSC in FMA 712. The first stock was the BSC population of Southern Madura, and the other stock was the other four population. The longest Euclidean distance was found at Southern Madura indicating similarity level with other populations was low. The discriminant analysis demonstrated the different result. There were three group populations, which every population in one group were able to represent the other population, namely Lancang Island-Cirebon, East Lampung-Rembang, and Southern Madura. Regarding to this study, it is recommended to manage BSC in Southern Madura separately.
Highlights
Order Decapoda has become a lot of research objects in Indonesia, including blue swimming crab (Hamid et al, 2015; Hamid and Wardiatno, 2015; Zairion et al, 2015a, 2015b; Hamid et al, 2016a; Kembaren et al, 2018; Zairion et al, 2020) because of its high economic value (Prabawa et al, 2014; Jayawiguna et al, 2017)
The objective of this study is to identify the stock unit of blue swimming crab (BSC) based on Truss Network Analysis (TNA) of morphometric characters in Fisheries Management Area (FMA) 712
The region is incorporated in the 712 State Fisheries Management Areas (FMA) of the Republic of Indonesia and is an area that intensively provides the highest foreign exchange earnings for crab export fisheries
Summary
Order Decapoda has become a lot of research objects in Indonesia, including blue swimming crab (Hamid et al, 2015; Hamid and Wardiatno, 2015; Zairion et al, 2015a, 2015b; Hamid et al, 2016a; Kembaren et al, 2018; Zairion et al, 2020) because of its high economic value (Prabawa et al, 2014; Jayawiguna et al, 2017). Distribution areas of these species are along northern Java and east Lampung. Along with efforts to increase the yield of crab fisheries, it is necessary to have sustainable crab management in order to decline increased fishing activity that has the potential to cause a decrease crab population (Wiyono and Ihsan, 2018)
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