Transcript Slide 1

PROGRESS REPORT
1st 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-14430
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 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
Stock
assesment
Harvest
control
rule
FISHERY MANAGEMENT AREA
Harvest Strategy
SITE LOCATIONS
PRELIMINARY RESULTS
ENUMERATORS
SIZE COMPOSITION
Carapace width (mm)
Location
Male
Female
min
max.
mean
min
max
mean
Cirebon
85,7
146,8
110,0±14,7
72,2
143,3
110,7±18,3
Demak
68,7
168,4
115,3±18,8
59,2
161,9
116,8±18,6
Rembang
70,4
159,2
117,1±15,5
79,0
165,6
117,8±15,8
Sumenep
85,4
147,1
111,8±14,9
77,7
143,8
112,0±18,1
Sampit
87,0
165,0
135,0±14,7
90,0
183,0
130,0±13,8
SIZE BY TYPE OF GEAR
Gears
Mini bottom trawl
Gillnet
Collapsible trap
Mean of carapace width (mm)
Demak
Rembang
Male
Female
Male
Female
102,1+15,6 103,9+15,8
102,6+14,7 107,1+13,2 116,9+16,0 110,7+15,6
122,1+17,1 124,3+16,8 117,7+15,0 118,8+15,6
LENGTH FREQUENCY DISTRIBUTION
Lm and Lc
Location
Cirebon
Demak
Rembang
Sumenep
Sampit
Mean
Std. Dev.
Lm (mm) Lc (mm)
98.12
116.19
112.47
115.55
101.51
116.58
100.06
111.68
126.78
129.50
107.79
11.99
Note :
Lm = Mean length (carapace width) at the first maturity
Lc /L50 = Mean length (carapace width) at capturity
117.90
6.77
L/W (MALE AND FEMALE)
250
150
y = 2E-05x3.2597
R² = 0.8878
n=123
250
y = 8E-06x3.4489
R² = 0.8372
n=295
100
150
100
50
50
0
0
0
20
40
60
80
CW (mm)
100
120
140
0
160
50
100
CW (mm)
50
100
150
200
250
y = 2E-05x3.2602
R² = 0.9219
50
-150 0
50
CW (mm)
W= 1E-05L3,385
R² = 0,941
0
0
50
100
150
W= 3E-05L3,191
R² = 0,927
200
0
200
0
50
100
CW (mm)
150
200
W (gram)
Sampit
y = 1E-05x3,404
R² = 0,910
50
100
CW (mm)
Sampit
0
200
400
CW (mm)
600
400
200
0
100
150
CW (mm)
Rembang
W (gram)
W (gram)
Rembang
200
200
Demak
y = 9E-06x3.4512
R² = 0.9544
0
400
150
450
600
400
200
0
W (gram)
W (gram)
Demak
W (gram)
Cirebon
200
W (gr)
W (gr)
300
Cirebon
Cirebon
200
150
200
600
400
200
0
y = 6E-05x3,036
R² = 0,878
0
50
100
CW (mm)
150
200
Lm and Lc
SPR – (preliminary)
SAMPLING STATIONS
-6.4°S
• ON BOARD (JULY 2014)
-6.45°S
-6.5°S
14 TRAWL STATIONS
9 OCEANOGRAPHIC
-6.55°S
-6.6°S
3
-6.65°S
5
4
12
-6.7°S
-6.75°S
1
13
2
CIREBON
6
8
9
14
7
10
-6.8°S
11
Gebang
-6.85°S
-6.9°S
108.4°E 108.45°E 108.5°E 108.55°E 108.6°E 108.65°E 108.7°E 108.75°E 108.8°E 108.85°E 108.9°E
OBSERVATION BY TYPE OF GEAR
CATCH RATES
-6.4°S
-6.45°S
-6.5°S
-6.55°S
-6.6°S
-6.65°S
-6.7°S
-6.75°S
-6.8°S
CIREBON
Tangkapan Ikan Demersal (kg)
0.475 to 1.34
Gebang
1.34 to 1.992
-6.85°S
1.992 to 4.13
4.13 to 5.511
-6.9°S
108.4°E 108.45°E 108.5°E 108.55°E 108.6°E 108.65°E 108.7°E 108.75°E 108.8°E 108.85°E 108.9°E
TRAWL
DREDGE
CATCH COMPOSITION
(BOTTOM GILLNET)
DREDGE
TRAWL
LENGTH FREQUENCY BY LOCATIONS
Carapace width (mm)
Location
min
Cirebon 85,7
Demak
68,7
Rembang 70,4
Sumenep 85,4
Sampit
87,0
Male
max.
146,8
168,4
159,2
147,1
165,0
mean
110,0±14,7
115,3±18,8
117,1±15,5
111,8±14,9
135,0±14,7
min
72,2
59,2
79,0
77,7
90,0
Female
max
mean
143,3
110,7±18,3
161,9
116,8±18,6
165,6
117,8±15,8
143,8
112,0±18,1
183,0
130,0±13,8
ENVIRONMENTAL & HABITAT
STA
1
2
3
4
5
6
7
8
9
10
11
12
13
DEPTH
(m)
9
7
7
8
6
2
9
8
-
SALINITY (‰ )
pH
DO (ppm)
TRANSPARANCY TEMPERATURE (OC)
SUBSTRAT
(m)
SURFACE BOTTOM SURFACE BOTTOM SURFACE BOTTOM SURFACE BOTTOM
6
28.3
28.2
32
32
5.9
6
6.3
5.3 Lumpur
6
28.5
28.1
32
32
7
6.1
6.9
6.8 Lumpur
2
29
28.7
31
32.5
6.6
6.4
6.4
6.5 Lumpur
2
29.5
29
30
31
6
5.9
6.3
6.4 Lumpur
0
28.2
27.9
31
31
7
6.7
6.8
7.6 Lumpur
0.5
28
28
29
29
7
7
7.3
7.3 Lumpur
2.5
29.2
28.6
30
30
7.3
7.4
6.6
7.3 Lumpur
3
28.3
28.2
31
32
5.5
6.6
8.6
8.7 Lumpur
-
Note :
“Lumpur” =muddy
ZOEA ABUNDANCE
Stadia
Zoea 1
Zoea 2
Zoea 3
Zoea 4
Megalopa
St. 1
1873
420
204
51
0
St. 2
2548
204
127
0
0
Est. Abundance
St. 3 St. 4 St. 5
573 2675 2956
541 1376 892
319 255 25
64 51
0
0
0
0
(Ind/m3)
St. 6 St. 7 St. 10 St. 11
15 19 96 3121
15 42 96 1847
15 31 32 1147
10 11 32 382
0
0 32 32