Status of the fishery resources of Danajon Bank.ppt [Read ... · Status of the fishery resources of...
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Status of the fishery Status of the fishery resources of resources of Danajon Danajon Bank Bank First Workshop on the First Workshop on the Formulation of the Formulation of the Danajon Danajon Bank Bank Fisheries Management Plan Fisheries Management Plan 28 June 2005 28 June 2005
Transcript of Status of the fishery resources of Danajon Bank.ppt [Read ... · Status of the fishery resources of...
Status of the fishery Status of the fishery resources of resources of DanajonDanajon BankBank
First Workshop on the First Workshop on the Formulation of the Formulation of the DanajonDanajon Bank Bank Fisheries Management PlanFisheries Management Plan
28 June 200528 June 2005
Without fisheries management intervention?
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2004 2005 2006 2007 2008 2009 2010
De
me
rsa
l fi
sh s
tock
s (t
on
s/k
m2
)
Habitat degradation
Illegal fishing Excessive fishing pressure
Destructive fishing
Current trend of demersal stock density decline
0
5
10
15
20
25
45 50 55 60 65 70 75 80 85 90 95
year
t/km
2
0- 10 m10- 20 m20- 50 m50-100 m
Compilation of demersal stock density estimates based on various trawl surveys in the Philippines from 1948 to 1995
Estimates of demersal stock densities in selected fishing grounds of the Philippines
Cinco & Perez, 199664.21.201994-95Ordoñez et al., 1972100.01.871972Sorsogon BayPura et al., 199752.01.041995-96Armada & Silvestre, 1981100.02.001979-80Carigara BayOchavillo et al., 198942.90.571987-88Villoso & Aprieto, 1983100.01.331978-79Lingayen GulfSoliman & Dioneda, 199712.41.311995-96Cinco et al., 199518.51.961992-93Vakily, 198220.12.131980-81Warfel & Manacop 1950100.010.61947San Miguel BayArmada, 199410.20.471992-93Silvestre et al., 198737.11.711968-72Warfel & Manacop 1950100.04.611949-50Manila Bay
SourceRelative density(% of baseline)
Stockdensity(t/km2)YearArea
With fisheries management intervention?
1.00
1.25
1.50
1.75
2.00
2004 2005 2006 2007 2008 2009 2010
Dem
ers
al
fish
sto
cks
(ton
s/km
2)
Restore habitat
Control illegal fishing
Reduce fishing pressure
Eradicate Destructive
fishing
With fisheries management intervention?
1.00
1.25
1.50
1.75
2.00
2004 2005 2006 2007 2008 2009 2010
Dem
ers
al
fish
sto
cks
(ton
s/km
2)
Restore habitat
Control illegal fishing
Reduce fishing pressure
Eradicate Destructive
fishing
DanajonDanajon Bank capture Bank capture fisheries profilefisheries profile
And the rest the coastal municipalities of Bohol
Number of fishers and fishing boats in DanajonBank and the rest of Bohol
1008,95210011,68610032,953Grand Total37.93,39556.56,60346.315,260Sub-total
1.65.421.043.31.71565.26083.81,256Mabini1.29.115.628.31.0911.31560.9283Candijay1.73.729.055.20.8704.75503.21,048Anda1.57.916.437.31.41262.22621.8596Guindulman1.411.336.768.50.9772.12501.4466Duero2.415.619.184.82.42192.32683.61,187Jagna2.24.69.129.60.8731.21451.4473G. Hernandez1.426.018.663.61.91711.01221.3418Valencia 1.49.836.765.20.7591.92201.2391Dimiao1.618.76.940.11.81620.5601.1348Lila1.37.326.042.90.9802.42861.4472Loay2.024.416.080.41.41220.7801.2402Alburquerque1.719.114.257.22.42131.41581.9637Baclayon2.111.720.566.63.22864.35025.01,634Dauis1.314.235.266.24.03567.58805.01,655Panglao1.226.421.957.83.73282.32732.2719Tagbilaran1.320.889.6139.60.6542.02331.1363Cortes1.76.015.936.20.7601.41591.1362Maribojoc1.215.838.964.34.23788.09334.71,544Loon1.320.930.567.13.53143.94583.11,006Calape
Rest of Bohol62.15,55743.55,08353.717,693Sub-total
1.947.720.1128.56.96202.22615.11,670Tubigon1.412.021.447.90.9841.31501.0335Clarin1.544.962.4162.97.06297.58746.92,281Inabanga1.519.961.5125.01.81594.249231,000Buenavista1.639.141.2127.77.46646.07006.62,170Getafe1.671.035.7165.516.61,4906.475010.53,476Talibon1.878.370.0264.710.59407.28409.63,176Bien Unido1.99.710.438.34.23803.54064.51,492Ubay1.710.410.736.76.65915.26106.42,093C P. Garcia
Danajon Bank%n%n%n
MBNMBFisher
sMBNMBFishers
Fisher to boat
ratio
Density (count/km coastline)Counts
Municipality
Coastal population
Fishers
Commercial fishing boats
Motorized fishing crafts
Non-motorized fishing crafts
All fishing gears
Gillnets and trammel nets
Hook and lines
Squid jig
Major Fishery resources exploited
AnduhawAnduhaw, , TamarongTamarong, , TulinganTulingan
DanggitDanggit, , BolinaoBolinao, , BaloBalo
LambayLambay, , NokusNokus, , LumayaganLumayagan
Ten most important issues raised by municipal fishers in Bohol Province in 2003
734Ban of certain fishing operations (ex. Trammel nets, sudsud, whale shark fishing, manta fishing, baling, etc.) affects the livelihood of the community
10
761Baling/Sahid operations9
1266Drive-in nets(bahan, sagiwsiw, or dagoydoy)8
20911Increase in the number of boats and fishers competing for limited resources in a limited area7
221111Fishing with noxious substances, (cyanide, tubli, etc)6
22193Blast fishing5
23419Decrease in fish catch attributed to overfishing4
46838Commercial fishing vessels operating inside municipal waters (ex. kubkub, likum)3
501337Spear fishing with compressor2
1371334Trawls and hulbot-hulbot operating in municipal waters1
DanajonBank
Rest of Bohol
TOTAL
Fishing ground
IssuesRank
1
2
3
45
Baseline data for Baseline data for DanajonDanajonBankBank
Information generated by the FISH Project for fishery resources management
Trawl survey (May 2004)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
cont rol 0
cont rol 1
cont rol 2
cont rol 3cont rol 4
0
5
10
15
20
13.3 18.3 23.3 28.3 33.3 38.3
Trawl Station
Actual Trawl Route
Average catch:
Total catch = 4.54 kg/30min of trawling1.33 kg/30min (excluding jellyfishes sea urchins and starfishes)
Planed and actual fishing stations used during the trawl survey
71%
jellyfishes, sea urchins
and starfishes
Estimation of biomass density
Cinco et al., 19951.961992-93
Estimates of demersal stock densities from trawl survey in Danajon Bank compared to some selected fishing grounds of the Philippines
FISH, 20040.452004Danajon BankSoliman & Dioneda, 19971.311995-96
Vakily, 19822.131980-81Warfel & Manacop, 195010.601947San Miguel BayArmada, 19940.471992-93Silvestre et al., 19871.711968-72Warfel & Manacop, 19504.611949-50Manila Bay Ochavillo et al., 19890.571987-88Villoso & Aprieto, 19831.331978-79Lingayen Gulf Pura, et al., 19971.041995-96Armada & Silvestre, 19812.001979-80Carigara Bay
SourceBiomass (mt/km2)YearFishing ground
Estimated demersalbiomass density:
0.45 tons/km2
Top 10 species/group caught during trawl survey
14.016.7Others3.52.3potpotLeiognathus rivulatus100.62.5taroroton, nokosLoligo sp.90.92.9silayScolopsis taeniopterus83.03.6moongApogon sp. 171.53.8tarorotonLoliginidae63.44.2timbunganUpeneus tragula50.36.4sunuganPlatycephalus indicus40.57.3buteteArothron sp.30.37.4banghutinSaurida tumbil2
72.042.9dangay, potpotLeiognathus splendens1% Number% WeightLocal nameSpecies/group
Bottom-set longline survey (June 2004)
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
18.0
20.0
14.0 16.0 18.0 20.0 22.0 24.0 26.0 28.0 30.0 32.0 34.0 36.0 38.0 40.0
Catch per unit effort: 4.77 kg/run
Comparison of CPUE of bottom-set longlineused for test fishing in the focal areas.
2008008001,000Number of hooks2.893.633.203.03Standard deviation3.714.877.064.77Average catch per operation
Tawi-TawiBay
LanuzaBay
CoronBay
DanajonBank
Focal area
20.713.4Others0.11.1saguksukAlutera monoceros102.11.2obodMuraenidae95.11.2bakasi, panangitanGymnothorax sp.80.21.3pugawoEpinephelus sexfasciatus79.22.9siwsiwPentapodus setosus61.93.4manilan-onLutjanus chrysotaenia56.83.6obodCongridae44.75.8lagawNemipterus hexodon313.315.5katambakLethrinus lentjan235.750.6bugaongTherapon jarbua1
% Number% WeightLocal nameSpecies#
Top 10 species/group caught during bottom-set longline survey in Danajon
Fish trap survey (June 2004)
Contr ol
0.000
5.000
10.000
15.000
20.000
13.300 18.300 23.300 28.300 33.300 38.300
Fishpot sites
Catch per unit effort: 1.06 kg/run
Top 10 species/group caught during the fish trap survey
21.521.5Others3.13.1salinggukodPentapodus caninus103.43.4bantolParacentropogon sp.93.53.5tabugokOctopus sp.84.54.5timbunganUpeneus sp.74.74.7silayScolopsis taeniopterus65.75.7gonggongHelotes sexlineatus57.37.3timbunganUpeneus tragula4
11.311.3siwsiwPentapodus setosus314.914.9kubawThalamita sp.220.220.2saguksukMonocanthus chinensis1
%Number%WeightLocal nameSpecies#
Catch and effort monitoring (May to July 2004)
Grid map and catch and effort monitoring points in Danajon Bank
Summary of CPUE from catch and effort monitoring in Danajon Bank (May-July 2004) compared to other FISH Project areas and similar fishing grounds
26.436.613.7palakayaBaby trawl
19.247.63.113.6bintolStationary liftnet
3.45.26.38.32.8panaHandspear
7.44.70.7sudsudScissor net
1.111.211.75.321.69.1buboFish trap
2.110.42.76.7panggal panglambayCrab pot
4.66.112.12.4107.65.4bungsod, towerFish corral
3.61.43.4sapyaw (sa lambay)Crab liftnet
2.05.43.92.31.5ulang-ulang; pangnokosSquid jig
2.53.913.44.35.62.5pasolSimple hook & line
2.219.64.412.53.7bira-bira, undakMultiple handline
7.819.815.69.011.04.5palangre, kitangBottom set longline
13.823.33.84.510.3dumbolSet gillnet w/plunger
12.130.255.911.721.57.4palutaw, paanodDrift gillnet
4.215.74.99.015.7palunod, palugdangBottom set gillnet
1994-199520012004200420042004
San Pedro Bay
San Miguel Bay
Tawi-Tawi Bay
LanuzaBay
CoronBay
DanajonBankLocal name (in Danajon
Bank)Fishing gear
Fishing frequency of all fishing gears
Average CPUE of all fishing gears
Gillnet – fishing frequency
Hook and line – fishing frequency
Danish seine – fishing frequency
Trawl – fishing frequency
Threats to fisheriesThreats to fisheries
Blast fishing
Coral rubbleIntact coral reef
Internal hemorrhage
Cyanide fishing
“An estimated 65 tons of cyanide are sprayed each year on Philippine coral reefs alone” Source: www.coralreef.org/factsheets/cyanide
Cervino et al. 2003.
A field test in the Philippines in 1980 showed that two exposures to cyanide three months apart can completely kill the exposed reef area (Barber, C.V. & V.R. Pratt. 1998)
Fish are approximately one thousand times more Fish are approximately one thousand times more sensitive to cyanide than humans sensitive to cyanide than humans
Effect of cyanide on corals
Coral specimens exposed to 600 mg/l CN-: (a) Acroporamillepora control, (b) A. millepora 24 h after exposure; (c) Heliofungiacontrol, (d) Heliofungia 72 h after exposure; (e) Trachyphillia geoffrio control, (f) T. geoffrio fully bleached 3 weeks after exposure (Cervino et al. 2003).
Effect of cyanide on corals
The relationship between the cyanide dose and mortality or zooxanthellae density in colonies of Pocillopora damicornis12 days after exposure to various cyanide doses. PC = ‘Parent Colony’ controls, HC = ‘Handling Controls’ (http://www.spc.int/coastfish/News/LRF/3/2Jones.html)
2.3413
2.1814
2.5412
2.7711
3.0510
3.399
3.818
4.357
5.086
6.105
7.624
10.163
cm (stretched)Number
pukot panglambay
palunod, patugkad
pang-anduhaw
pukot palaran
pangmangsi
Fine mesh nets among gillnets
Fine mesh
Round haul seine, Lawag
ave. mesh size: #25-28
target: bolinao
4
5.5
7
8.5 baling
kurantay
lawag
sapyaw
0
20
40
60
%
length
gear
balingkurantaylawagsapyaw
69
12
15
18
21
24palundag
patuloy
undak
pasol
lawag
0
10
20
30
40
50
%
length
gear
palundagpatuloyundakpasollawag
bolinao
anduhaw
Other fine mesh nets
Fish corral, Bungsod, tower
ave. mesh size (bunt): #16-20target: pasayan
ave. mesh size: #22-28target: small pelagics
Stationary liftnet, New LookOther fine mesh nets
Otter trawl, Palakaya
ave. mesh size (codend): 1.7 cmtarget species: pasayan
ave. mesh size (codend): <3 cmtarget species: demersal spp.
Danish seine, Liba-liba
Other fine mesh nets
Beach seine, Baling
ave. mesh size (codend): <3 cmtarget species: nearshore, demersal spp.
Pushnet, Sudsud
Other fine mesh nets
0 5 0 10 0 1 50 2 0 0
d y n a mite
s pe a r w ith c o mp res s o r
c rab g illne t
B o tto m s e t g illne t
Dr if t g illne t
s imp le ho o k an d lin e
Han d s p e a r
tra mme l ne t
s ta tio n a ry lif tne t
B o tto m s e t lo ng lin e
Fis h tra p
s e t g illn e t w ith p lun g e r
Dr iv e - in g illne t
En c ir c ling g illne t
Fis h c o r ra l
B a r r ie r ne t
B e a c h s e in e
o tte r tra w l
s c is s o r ne t
f ilte r ne t
d an is h s e in e
P ie ce s p e r k g
Average sizes of danggitexpressed in pieces per kilogram caught bydifferent fishing gears used in Danajon Bank.
Unfriendly fishing gears?
Other fine mesh nets
RingnetRingnet
Baby Baby RingnetRingnet
Baby Trawl
Danish seine
Active and commercial fishing gears
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