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No Thumbnail AvailableProjectComparative study between mono and polyculture systems on the production of prawn and milkfish in brackishwater ponds
Establishment of a Network of Aquaculture Centres in Asia
1987Also available in:
No results found.The growth, survival, production and economic feasibility of milkfish and prawn grown singly and in combination are described. Stocking density combination involved 20,000 prawn jv/ha with 2,000 milkfish fingerlings/ha for polyculture; 20,000 prawn juv/ha in monoculture; and 2,000 milkfish fingerlings/ha in monoculture. After 109 culture days, results showed no significant difference (p<0.05) on growth and survival rates of both commodities in two culture schemes. Mean weight gain was 30.88 g fo r prawn and 263.33 g for milkfish in monoculture and 31.85 g and 210.57 g for prawn and milkfish, respectively, in the polyculture system. Mean survival rates were 94.03 percent for prawn and 99.0 percent for milkfish in polyculture; and 82.13 percent for prawn and 92.33 percent for milk-fish for the polyculture system. Net aggregate production, however, was highly significant in polyculture, attaining 923.50 kg/ha/crop. Economic feasibility revealed encouraging results for polyculture over mono culture, with return on investment (ROI) valued at 45 percent for polyculture. -
No Thumbnail AvailableProjectShrimp culture: pond design, operation and management
Establishment of a Network of Aquaculture Centres in Asia
1986Also available in:
No results found. -
No Thumbnail AvailableProjectThe culture of the giant freshwater prawn (Macrobrachium rosenbergii de Man) in Cuba. Report of the first technical assessment mission, May 7th - 30th 1990 1990
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No results found.The Cuban government wish to expand the tourist industry as a sorce of much needed foreign exchange. Opportunites to supply and support the industry are actively being sought and include the provision of fish and shellfish foods from fisheries and aquaculture to supply the hotel and restaurant enterprises throughout the designated tourist areas. The culture of the Giant Freshwater prawn (Macrobrachium rosenbergii) is one such Trials are being made with pond reared stock using three methods to improve breeding; i) eyestalk ablation; ii) photoperiod manipulation; iii) artificial insemination. In the hatchery larvae are fed algae followed by minced clam, squid, marine fish and Artemia but Nippai prepared feeds are also used. A nursery phase is employed lasting 30–40 days which takes the shrimp from 5–10 day old post-larvae to 0.5 to 1.0 g juveniles. Stocking rate is 100/sq m but trials, have been made with 1000–2000 in 70 t tanks. In the on-growing phase shrimp are stocked at 5/m2, feed is given at from 15 to 2.5% per day and salinity is 25%. Feed costs around 200–250 pesos per tonne and contains squid, shrimp meal (from processed P. schmitti caught at sea) and zeolite. Problems with unstable artificial feed are common. Production is around 400–500 kg/ha/cycle and at present there are 1.6 to 1.7 cycles/yr. Newness of the ponds, inexperience and climatic changes are constraints on production. Early trials with P. notialis were not encouraging as growth stopped at 6–8 g, howev er new trials may be undertaken.
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