REPRODUCTION AND POND REARING OF THE AFRICAN CATFISH IN SUB-SAHARAN
Gertjan de Graaf
and Johannes Janssen
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.
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.
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.
IN THE USE OF GEOGRAPHICAL INFORMATION SYSTEMS IN FISHERIES MONITORING,
ANALYSIS AND MANAGEMENT
manual was prepared for a training workshop for fisheries biologists
in Bangladesh organised in August 2000.
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.
Table of contents
(full version 8 mb pdf file)
version without pictures (0.5 mb pdf file)
and Fish farming in Vietnam
of Arjo Rothuis
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.
DEVELOPMENT OF ARTISANAL FISHERIES (IDAF)
AND FISH STOCK ASSESSMENT IN STRATUM VII OF LAKE VOLTA
G.J. DE GRAAF and P.K. OFORI -DANSON
AND AGRICULTURE ORGANISATION OF THE UNITED NATIONS