PROGRESS REPORT 1 st SEMESTER (JANUARY – JULY 2014) THE ASSESSMENT ON BLUE SWIMMING CRABS (Portunus pelagicus (Linnaeus, 1758)) FISHERIES IN NORTH COAST OF JAVA Research Center for Fisheries Management and Conservation (RCFMC) Jl. Pasir Putih 1, Ancol Timur, Jakarta for Indonesia Blue Swimming Crab Processors Association (APRI) Jl. KIG Raya Selatan Kav C-5, Gresik, East Java, Indonesia

BACKGROUND Crab fishery has contributed as one of the source livelihood of small-scale fishers in the North of Java since the 1970s and still exist seasonally until to date. An intensive fishing increased since the 1990s, this along with increasing international market demand (FAO, 2013). Blue swimming Crabs (Portunus pelagicus Linnaeus, 1758) – An economic important marine species, it ranked under tuna and shrimps. – Sumiono (1997) and Sumiono et al. (2011) informed that Blue swimming Crabs in Indonesia distributed along the coastal area of east Sumatera, north of Java, South of Sulawesi, South and East Kalimantan. – Among them, Jakarta and Cirebon Bays, Brebes, Rembang and Madura strait were the main fishing areas in the north coast of Java – The estimate export volume in 2012 is around 28,000 tons, which is commercially valued at around 330 million USD (Fauzi, 2013).

The annual production in 2008 estimated at around 34,000 tons (FAO 2011) and it contributed 20% of world production after China. Worldwide policy on sustaining fish for food (including blue swimming crabs) should consider safety, security and sustainability issues of its resources. Wall Mart, Costco Wholesale, Sam’s Club Whole Foods Market and others (Crawford, 2013) adopted those mainstreams of world market system. By 2020, it is expected that world buyers on fish product will only accept products that have been eco-labeling certified issued by the Marine Stewardship Council (MSC). Since 2014, RCFMC and APRI carried out a Blue swimming crab fisheries assessment in the north coast of Java. Observation was carried out through enumerator and onboard data collection system.

OBJECTIVES TO MAP THE FISHERIES AND ITS FISHING TACTIC AND STRATEGY TO COLLECT THE BIO-EXPLOITATION DATA TO MEASURE SEASONALLY IN-SITU ABUNDANCE TO DO AN ASSESSMENT ON STATUS OF BLUE SWIMMING CRABS IN JAVA SEA

METHODS DATA COLLECTING SYSTEM DESK STUDY SELECT AND TRAIN ENUMERATORS ENUMERATORS – VALIDATION ON BOARD SURVEY – EST. ABUNDANCE – ECOLOGICAL RELATED SPECIES – ENVIRONMENTAL CHARACTERISTICS

Fishery dependent: landings enumerator sampling Fishery independent (at sea research): Charterd Fishing Boats Biological data Catch Effort Catch composition Biological data Catch Effort Catch composition Biological data Catch composition By-catch Catch-rate Larva Habitats Biological data Catch composition By-catch Catch-rate Larva Habitats Population parameters (L∞,K,to, Z, M,F,E) Lm Lc Indices of stock abundance & recruitment Est.Biomass & SSB MSY Genetic population Mapping life cycle Population parameters (L∞,K,to, Z, M,F,E) Lm Lc Indices of stock abundance & recruitment Est.Biomass & SSB MSY Genetic population Mapping life cycle Harvest control rule Stock assesment FISHERY MANAGEMENT AREA Harvest Strategy

SITE LOCATIONS

PRELIMINARY RESULTS ENUMERATORS

SIZE COMPOSITION Location Carapace width (mm) MaleFemale minmax.meanminmaxmean Cirebon85,7146,8110,0±14,772,2143,3110,7±18,3 Demak68,7168,4115,3±18,859,2161,9116,8±18,6 Rembang70,4159,2117,1±15,579,0165,6117,8±15,8 Sumenep85,4147,1111,8±14,977,7143,8112,0±18,1 Sampit87,0165,0135,0±14,790,0183,0130,0±13,8

SIZE BY TYPE OF GEAR

LENGTH FREQUENCY DISTRIBUTION

Lm and Lc Note : Lm = Mean length (carapace width) at the first maturity Lc /L50 = Mean length (carapace width) at capturity

L/W (MALE AND FEMALE)

Lm and Lc

SPR – (preliminary)

SAMPLING STATIONS ON BOARD (JULY 2014) 14 TRAWL STATIONS 9 OCEANOGRAPHIC

OBSERVATION BY TYPE OF GEAR

CATCH RATES TRAWLDREDGE

CATCH COMPOSITION (BOTTOM GILLNET)

DREDGE

TRAWL

LENGTH FREQUENCY BY LOCATIONS

ENVIRONMENTAL & HABITAT Note : “Lumpur” =muddy

ZOEA ABUNDANCE