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Indonesia - Improvement of milkfish pond production in Jepara, central Java. A report prepared for the brackishwater shrimp and milkfish culture applied research and training project

Year of publication 1979

Pages p.54

Author Pedro G. Padlan;Fisheries and Aquaculture Management Division

Product type Project

Edition 1

Synopsis (short abstract) This is one of a series of field documents prepared during the course of the UNDP project identified on the title page. The conclusions and recommendations given in the report are those considered appropriate at the time of its preparation. They may be modified in the light of further knowledge gained at subsequent stages of the project. The designations employed and the presentation of the material in this document do not imply the expression of any opinion whatsoever on the part of the Unite d Nations or the Food and Agriculture Organization of the United Nations concerning the legal or constitutional status of any country, territory or sea area, or concerning the delimitation of frontiers.

Cite this content as:

Padlan, P.G. Jul 1979. Indonesia - Improvement of milkfish pond production in Jepara, central Java. A report prepared for the brackishwater shrimp and milkfish culture applied research and training project. 54 p.

Language English

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    This report gives an account of penaeid shrimp culture development work including postlarval production, nursery rearing and pond culture. The postlarval culture method was established for Penaeus monodon and P. merguiensis using different types of culture vessels. The total number of postlarvae produced in 1975 was 580 300 and production has increased to over 4 million in 1977; this figure will be rapidly increased in 1978 from induced gonad maturation and spawning. The highest P. monodon postl arvae per brood in a 10 m3 tank was achieved by producing 375 000 with 73 percent survival, and 320 000 with 52 percent survival for P. merguiensis. Mass-culture systems of phytoplankton and rotifers were established for larval food organisms. The particulated soybean curd and rotifers were used for the larval diet to substitute for Artemia nauplii. Artemia will still be needed for a better survival rate. Various types of nursery methods were experimented on formulated diet and on natural food in ponds; the optimal nursery stocking densities were determined. A series of pond culture results indicated that interim fish extermination by using 7 ppm derris root extract was effective. The annual shrimp production in pond projected from preliminary results indicated that 600 kg per ha per year is possible, utilizing natural productivity with the fertilization but no feeding. This phase of the work needs to be repeated. Based on the experiments, recommendations are outlined for f urther work to increase production.
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    Comparative study between mono and polyculture systems on the production of prawn and milkfish in brackishwater ponds
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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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