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No Thumbnail AvailableProjectIndonesia - Improvement of milkfish pond production in Jepara, central Java. A report prepared for the brackishwater shrimp and milkfish culture applied research and training project 1979
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No results found.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. -
No Thumbnail AvailableProjectInvestigations on acid sulfate soils of the Brackishwater Experimental Fish Farm, Buguma, Rivers State
Establishment of African Regional Aquaculture Centre
1987Also available in:
No results found.A study conducted on the soils of the brackishwater experimental fish farm Buguma, showed that the area contains potential acid-sulfate materials within 12cm of pond bottom in the soil profile. The sulfate sulfur (SO4-S) content of the sulfidic horizon is 2,700ppm. High values of exchangeable acidity and Al were also recorded for this horizon. Values were 16.96 and 7.89 meq/100g of soil respectively. The soils are saline, characterised by high soluble salt content and high values of K, Ca and Mg ions. pH values in the wet state ranged between 7.7 and 6.9, but on air drying, values went down to as low as 3.1. Total nitrogen and available phosphorus were relatively low, values ranged from 0.07 – 0.35% and 1.40 – 7.08 ppm respectively. Lime requirement was calculated for the soils; results indicate the need for approx. 4.1 tonnes of agricultural lime per hectare for neutralization -
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.
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