Central Java
Indonesia
Blue Swiming Crab Trap
Location & History
Blue Swimming Crab (BSC) fisheries have long supported coastal communities along the northern coast of Central Java. Fishing activities are concentrated in areas such as Demak, Rembang, Pati, and Pemalang, where Blue Swimming Crab has become an important source of livelihood for small-scale fishers and seafood supply chains.
In collaboration with industry stakeholders and the Indonesian Blue Swimming Crab Association (APRI), efforts have been undertaken to strengthen fishery management through catch monitoring, traceability programs, and data collection initiatives. These activities support responsible harvesting practices and contribute to broader fishery management objectives in Indonesia.
The fishery operates within Indonesia’s Fisheries Management Area 712 (WPP 712) in the Java Sea, one of the country’s most important regions for Blue Swimming Crab production. The fishery contributes to local economies while supplying both domestic and international markets.
How is the Blue Swimming Crab Caught?
Blue Swimming Crab from this fishery is harvested using baited collapsible traps, a fishing method widely used by small-scale fishers throughout Central Java. Traps are designed to target crabs while reducing interactions with non-target species, making them a selective fishing method for Blue Swimming Crab.
Fishing trips are generally conducted by small vessels operating in nearshore coastal waters over sandy and muddy seabed habitats. Most trips are completed within a day, allowing fishers to return fresh catches to landing sites and local collection centers.
Following landing, crabs are sorted according to applicable regulations and buyer specifications. Ongoing monitoring and data collection activities help improve understanding of catch trends and support responsible fishery management.
Unique Features & Fun Fact
The Blue Swimming Crab fishery in Central Java supports thousands of people throughout the supply chain, from fishers and collectors to processing facilities and export operations. As a result, the fishery plays an important role in sustaining coastal livelihoods and local economic activity.
Many fishing communities in Central Java have participated in fishery improvement and monitoring initiatives aimed at strengthening resource management and maintaining market access. Collaboration among fishers, processors, government agencies, and industry associations continues to support these efforts.
Fishing activities occur within the productive coastal waters of the Java Sea, where sandy and muddy habitats provide suitable environments for Blue Swimming Crab and a variety of other marine species.
Meet The Fishers
Fleet Capacity
Target Species
Blue Swimming Crabs
Blue Swimming Crab is a brachyuran crab in the Portunidae family. Crabs from this family are usually recognized by their flat, paddle-shaped hind legs used for swimming and by the nine spines along each side of the carapace. Males are typically bright blue with white markings, while females are generally greenish-brown with a broader, rounded carapace.
Blue Swimming Crab (Portunus pelagicus) is widely distributed throughout tropical and subtropical waters of the Indo-Pacific region. The species inhabits shallow coastal environments including sandy bottoms, mudflats, seagrass areas, estuaries, and coastal waters adjacent to mangrove ecosystems. It grows relatively quickly, matures within approximately one year, and has a lifespan of around three years.
In Central Java, Blue Swimming Crab is highly valued for its sweet flavor and delicate white meat. The fishery relies on wild-caught crab resources harvested from coastal waters of the Java Sea using traditional trap fishing methods.
Fishing Gear
Fishing Gear
Fishing techniques for Blue Swimming Crab vary but primarily involve the use of traps. Fishers deploy baited traps in shallow coastal waters to target crabs selectively, minimizing bycatch and environmental impact. Traps designed to minimize habitat damage and allow for the release of undersized crabs. These traps are checked frequently to ensure captured crabs remain healthy and to reduce mortality rates. Traps are round or square-shaped (depending on the locality), usually measure 32 × 51 × 21 cm, are made of wire mesh or a galvanized steel frame with two funnel entrances, and are sometimes covered by a polyethylene, green, square- or diamond-shaped net. Typically, there are 150 to 400 baited traps (with fish pieces)—the number limited only by the size of the boat—that are connected to a main line, and these are set by boat on sandy bottoms to depths of 20–50 m. Traps are soaked overnight and the catch is collected on-site.
Fishery Association
What is an industry association?
Industry associations are organizations responsible for promoting and enforcing standards, regulations, and best practices within a specific sector. These associations support businesses by providing resources, educational programs, and advocacy to ensure industry compliance and growth. Additionally, they engage in lobbying efforts to influence policymakers on issues affecting the industry.
Asosiasi Pengelolaan Rajungan Indonesia (APRI)
The Asosiasi Pengelolaan Rajungan Indonesia (APRI) was established to unify and represent the Blue Swimming Crab (BSC) industry in Indonesia. As a key player in promoting sustainability and best practices, APRI ensures that the harvest and processing of BSC align with international standards. Its members include fishers, processors, and exporters, reflecting the entire supply chain.
APRI focuses on creating sustainable fisheries through measures such as promoting the use of traps and gillnets, ensuring traceability, and supporting data-driven fisheries management. The association works closely with government bodies, NGOs, and international organizations to implement conservation strategies that benefit both the marine ecosystem and the livelihoods of coastal communities.
In addition, APRI actively participates in educational programs, training sessions, and resource management initiatives to support its members. Through these efforts, APRI is committed to building a sustainable future for Indonesia’s Blue Swimming Crab fishery while ensuring compliance with international market requirements.
Regional Fisheries Management in Central Java
Blue Swimming Crab Fisheries in Central Java
Blue Swimming Crab fisheries in Central Java are managed under Indonesia’s national fisheries regulations established by the Ministry of Marine Affairs and Fisheries. Management measures include minimum legal size requirements, protection of egg-bearing females, and harvest control measures outlined in the national Blue Swimming Crab management framework.
The fishery operates primarily within Fisheries Management Area 712 (WPP 712) of the Java Sea. Monitoring programs, stock assessments, and fishery data collection contribute to ongoing efforts to improve understanding of stock conditions and fishing activities within the region.
Blue Swimming Crab fishing activities are generally conducted in nearshore waters characterized by sandy and muddy substrates. Trap fishing remains an important method used by small-scale fishers targeting Blue Swimming Crab in many coastal communities throughout Central Java.
Industry organizations such as the Indonesian Blue Swimming Crab Association (APRI) collaborate with fishers, collectors, processors, researchers, and government stakeholders to support traceability, fishery monitoring, and responsible fishing practices. These efforts aim to strengthen compliance with applicable regulations and support long-term sustainability of the fishery.
Through these combined efforts, the Central Java Blue Swimming Crab fishery continues to contribute to coastal livelihoods while supporting the ongoing development of responsible fisheries management in Indonesia.
