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The Australian Northern Prawn Fishery

Year of publication 1987

Product type Document

Edition 1

Language English

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    Improved techniques for prawn breeding 1987
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    An evaluation was made of available hatchery facilities and existing procedures in order to plan out a strategy for captive broodstock and maturation for the prawn Penaeus orientalis in Xincun, China. Information on the life history of the species was valuable in outlining specific activities in three general areas of the breeding process -- Spawning, induced maturation, and overwintering of broodstock. Facilities and equipment required to support the breeding effort are identified including a m aturation building and tanks for-maturation and spawning. Finally, training was given to the project staff in the form of lecture-slide presentations and discussions in preparation for the April-May 1988 breeding work.
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    Comparative 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
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    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.
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