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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 -
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No Thumbnail AvailableProjectFish feed requirements and manufacture, Central African Republic
Hatchery Production and Research Centre
1984Also available in:
No results found.The Hatchery Production and Research Centre at Bangui-Landjia Project was established in 1980 under the FAO/Government Cooperative Programme (GCP/CAF/007/NET) with funds provided by the Government of the Netherlands. The project is engaged primarily in work on the African catfish (Clarias lazera), although activities outside the hatchery building itself include pond experiments and small-scale commercial production of Clarias and tilapia in polyculture. Because catfish culture generally requ ires artificial feeding, these experiments are important in determining the technical and economic feasibility for commercial production of the species, using feeds made from a rather limited selection of local ingredients. The need to process compound feeds arises from the desire for diets with high water stability in order to prevent feed wastage and to control fish disease. Feed processing equipment purchased earlier under the FAO project Vulgarisation de la Pisciculture et Autofinancement des Stations Piscicoles Principales (CAF/80/002), referred to in this report as the other FAO project, are employed in making all feeds presently required for the project. As part of the operation of the project, FAO assigned Dr K. W. Chow, Fish Feed Technologist, Aquaculture Development and Coordination Programme, as a consultant to the project. This report summarizes the consultant's findings made during the period 7 to 17 November, 1983, concerning the supply of feed ingredients to meet bot h present and future needs of the station and the state of existing feed manufacturing machinery and their need for repairs and upgrading. It also includes a brief description of repairs carried out on the machinery during the period, construction of equipment for moist, pelleted feed production, and discussions with Mr J. A. L. Janssen, FAO Fish Culture Expert on the project, concerning his work plan for 1984.
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