ARTIFICIAL REPRODUCTION AND POND REARING OF THE AFRICAN CATFISH IN SUB-SAHARAN AFRICA

A Handbook

by

Gertjan de Graaf and Johannes Janssen

The African catfish, Clarias gariepinus, has been reared for almost 20 years in Africa with mixed success. Since the early 80's both authors have been involved in the development of suitable husbandry techniques and the propagation of African catfish. This handbook is a compilation of several training manuals written by the authors for several projects in Congo-Brazzaville, Central African Republic, Nigeria and Kenya. This handbook deals with the artificial reproduction and pond rearing of the African catfish in Sub-Saharan Africa and aims to provide up-to-date information on production methods that have proved to be reliable in the field.

This manual has been prepared as an easy-to-read guide for the reproduction and grow out of the African catfish (Clarias gariepinus). It has a practical orientation and includes the latest developments. It was written for extension officers and university aquaculture students.

This is the original FAO Fisheries Technical Paper. No 362, Rome, FAO. 1996. 73 p. it is out of stock, therefore we provide the opportunity to download/read the original text.

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AN INTRODUCTION IN THE USE OF GEOGRAPHICAL INFORMATION SYSTEMS IN FISHERIES MONITORING, ANALYSIS AND MANAGEMENT

The manual was prepared for a training workshop for fisheries biologists in Bangladesh organised in August 2000.

The intention of this manual is:

• To provide some basic information on GIS to fisheries biologists and environmentalists who have no previous experience with GIS.
• To provide examples/exercises on how GIS can be used in fisheries
• To provide basic principles in the form of an exercise demonstrating how GIS can be used for the development of decision support models in floodplain fisheries.

The manual should not be considered as a complete training manual on GIS; for that it is incomplete as it covers only a small number of methods and does not provide the details and mathematical background of a number of analytical tools.

It is realised that most of the training is based on data on floodplain fisheries in Bangladesh. However, the basic principles can be in applied other countries or fisheries ecosystems.

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Rice and Fish farming in Vietnam

PhD of Arjo Rothuis

ABSTRACT

Recent studies indicate that continuing intensification of rice cultivation has both technical and economical limits, and may not be sustainable in the long term. Crop diversification and integrated crop-livestock-fish farming systems are considered of particular relevance for the future development of agriculture. The natural conditions in the Vietnamese Mekong Delta favor aquatic life. Therefore, the integrated production of rice and fish seems an appropriate alternative for ricemonoculture, however at present less than 5% of the total rice area in the Mekong Delta is being used for rice-fish culture. Besides, various studies have indicated a synergistic interaction between rice and fish, resulting in improved rice yields from rice-fish fields. The central issue of the present thesis is the identification of technological and socio-economical constraints of rice-fish culture ("on-farm") in order to understand the reasons for the low application rate of rice-fish culture, and the investigation of agronomical and aquacultural improvements of rice-fish culture ("on-station") to make the system more attractive for rice farmers. The major conclusion was that for a further adoption of rice-fish culture, the economical incentive of the integration of fish in the farm should be improved. This can be achieved by reducing the fish operational costs (lower stocking density, appropriate feeding strategy), minimizing the trench area, and improving the fish yield through a reduction of the rice seeding rate, stocking fish early in the dry season and harvesting before October, and proper field construction. Within the context of the present thesis, it was argued that the most suitable fish species for concurrent rice-fish culture with intensive rice cultivation, are silver barb and Nile tilapia.

IDAF/Technical Report/97/I

INTEGRATED DEVELOPMENT OF ARTISANAL FISHERIES (IDAF)
(GHA/93/008)

CATCH AND FISH STOCK ASSESSMENT IN STRATUM VII OF LAKE VOLTA

By

G.J. DE GRAAF and P.K. OFORI -DANSON

FOOD AND AGRICULTURE ORGANISATION OF THE UNITED NATIONS
ROME, 1997

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