Asia-Pacific Tropical Sea Cucumber New Caledonia...
Transcript of Asia-Pacific Tropical Sea Cucumber New Caledonia...
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Asia-Pacific Tropical Sea Cucumber Aquaculture Symposium
15-17 February 2011, SPC, Noumea,
New Caledonia
Large-scale sandfish production for pond culture in Vietnam
by Nguyen Dinh Quang Duy
Research Institute for Aquaculture No. (RIA3)
email: [email protected]
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Introduction High demand in China
Overfishing in the Asia-Pacific
Hatchery and juvenile production techniques have been developed and documented (Battaglene, 1999; Pitt and Duy, 2004; Duy et al, 2005; Agudo, 2006; Duy, 2010)
RIA3 – ACIAR – The worldFish Center projects Hatchery. restocking, sea ranching and pond culture since 2000
Since 2000
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Simplifed techniques on seed production of sandfish in Vietnam
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Sandfish broodstock management
Collected BS from the wild/pond
Conditioning BS in tanks
Control temperature
below 30 oC
Feeding with shrimp starter feed
Co-culture with Babylon snail
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Larval rearing
Optimum density: 200-300larvae/l
Suitable algae:
Chaetoceros muelleri
Control predators
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Juvenile production
Simplified hatchery methods applied
50,000 competent
juveniles produced from batches of 2 million eggs.
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Large- scale sandfish production for pond culture
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Design of model ponds
Provinces: Phu Yen, Khanh Hoa, NinhThuan
Pond sizes: 0.45-0.95 ha
Number of model ponds: 6
Located near the intertidal zone, close bay
Substrates: coral sandy and muddy sand
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Pond preparation
Dry the pond by draining through sluice –gates and pumping
Remove predators and unwanted seaweed.
Till the sediment to disturd and wash the mud layer, keep the substrate a burrying layer of about 5 cm.
Build a net pen at the sluice-gates to prevent the entry of predators and escape or massing of sandfish in this.
Apply lime (agriculture or hydrated) at 0.5-1.0 ton/ha.
Fill up water 1 week prior to stocking juveniles.
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Transportation of juveniles
Used open transportation for high survival rate
Defecated juveniles in about 1-2 days prior to transportation
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Water quality management
Temperatures, salinities were monitored daily
Water exchange
Stratification of pond water
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Results of sandfish pond-culture models in three provinces in 2008-2009
Province Total
Area
(m2)
Average
size of
juvenile
stocked (g)
Density
(juvenile/m2) Harvested
Average
weight
(g)
Average
Survival
rate (%)
Duration
(day) Yeild
(ton/ha)
Khanh Hoa 14,000 2 1 350 80 420 2.8
Phu Yen 10,000 10 1 310 85 305 2.63
NinhThuan 10,000 20 1 300 87 274 2.61
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Harvest
• Duration: 9-14 months
• Commercial sizes is more
than 300g each
• Havest partly or fully
• Harvest by hands or trawl net
• Yeild at 2.61-2.8 tonnes/ha
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processed by new methods
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and traditional methods
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Trained sandfish farmers
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Thank you very much!!!
Happy New Year 2012