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.
training manual on the use of Geographical Information system in
FAO. 2003. Geographic
Information Systems in fisheries management and planning.Technical
manual, by G. de Graaf, F.J.B. Marttin,J. Aguilar-Manjarrez &
J. Jenness. FAO Fisheries Technical Paper No. 449. Rome. 162p.
biologists and policy makers involved in inland fisheries
management and planning are unaware of GIS technology and its potential
for fisheries planning and management. The FAO Inland Water Resources
and Aquaculture Service (FIRI) has been active for the last 19 years
in promoting the use of GIS and remote sensing in fisheries and
aquaculture. Promotional activities have been carried out through
training, projects, field missions, and oral presentations and publications.
However, a manual to use along with GIS software for the fisheries
biologists in the field explaining GIS in a way that is understandable
to non-GIS users had not been produced until now. This manual was
written to overcome this knowledge-gap, it is a do-it-yourself
manual giving a short introduction to GIS software and its applications
in fishery science.
objective of this manual is to encourage fishery managers to use
this tool (GIS) to foster the sustainable use of natural resources.
The manual is aimed at fisheries biologists, aquatic resource managers
and decision makers in developing countries who have no knowledge
about GIS. The manual was written for use with ESRIs ArcView
3.x and Spatial Analyst software.
There are five
main sections in the manual:
concepts and functions and key tools provided by ArcView 3.x,
coordinate system and map projections,
data and analysis,
are accompanied by exercises that have been designed to illustrate
key applications of GIS in inland and marine fisheries management.
Also, a custom-designed ArcView grid regression extension is included
to show the integration of GIS with surplus production models.
At the end of
the training with this manual, the reader should be able to: apply
learned principles and GIS to their own professional situation,
perform analyses on their own data, be aware of the vast possibilities
that GIS can provide and be able to communicate with GIS expert
The manual is
useful for a broad range of fishery applications. However, this
manual by no means covers all possibilities of GIS, it merely touches
upon some of the most important features for fisheries management
Gertjan de Graaf, Bram
Born, AM Kamal Uddin & Felix Marttin
Floodplain fisheries are a major aquatic common property resource
in Bangladesh. However, the modification of the floodplains into
croplands and the increasing number of people who were fishing the
remaining waters seriously endangered this valuable ecosystem. During
the Flood Action Plan in the early '90s a number of studies were
carried out which examined the impact of water management on fisheries.The
Compartmentalisation Pilot Project or FAP 20 is a water management
project implemented from 1991 until 2000 and was financed by the
Governments of Bangladesh, the Netherlands and Germany. Fisheries
were a major component of the project and were thoroughly monitored
from 1992-2000 The major results were presented in a final report
(CPP, 2000) but it was felt that the results obtained
experiences gained on fisheries in the CPP project went beyond the
original scope of the program for CPP. Some of them are of importance
for inland fisheries in Bangladesh and tropical floodplain fisheries
in general and were not covered in the final report. This book presents
more detailed information on the different methods applied, results
obtained and insight gained on floodplain fisheries in Bangladesh.
The book presents the results of a number of analytical fisheries
methods such as: habitat stratified fisheries monitoring, the use
of Geographical Information Systems in fisheries, surplus production
modeling and length-based fish stock assessment. These methods are
not commonly used in Bangladesh. Therefore the book should be of
interest to fisheries scientists, students and policy planners involved
with floodplain fisheries management and poverty alleviation.
Graaf is a fisheries biologist and worked the last 35 years
in tropical aquaculture and fisheries Since the early '90s he has
worked in a number of fisheries projects in Bangladesh. In 1992
he became the fisheries advisor of CPP, set up and supervised the
program until the end in 2000. At present he is senior
fisheries consultant with NEFISCO Foundation in Amsterdam (the Netherlands)
is a fisheries biologist. He joined the project in 1994. From 1996
till 1998 he worked for FAO on culture based fisheries systems and
inland fishery enhancement. Presently he is working as fisheries
biologist at the Charles Darwin Research Station on the Galapagos
Islands in Ecuador.
Uddin is a fisheries biologist and joined CPP from 1992 till
1996. At present he is fisheries advisor with the Center of Natural
Resource Studies (CNRS) in Bangladesh.
is a fisheries biologist who joined CPP in 1998 till the end of
the project in 2000. He is currently working at FAO headquarters
in Rome on inland fisheries enhancements
Value of African Fisheries
de Graaf, G.
& Garibaldi, L. 2014.The value of African fisheries.
FAO Fisheries and Aquaculture Circular. No. 1093. Rome, FAO. 76
version francais pdf
download english pdf
value of African fisheries study was carried out in the framework
of the New Partnership for Africas Development (NEPAD)-FAO
Fisheries Programme (NFFP) funded by the Swedish International Development
Cooperation Agency (Sida). The aim was to estimate the contribution
to national and agriculture Gross Domestic Products (GDPs) and the
employment generated by the whole
fisheries sector, defined as including inland and marine capture
fisheries, post-harvest, licensing of local fleets, and aquaculture.
Information was provided by 42 experts from the 23 countries (more
than 40 percent of all African States) collaborating in the study.
To obtain indicative figures for the entire continent, data from
the sampled countries were analysed and calibrated to extrapolate
values for the non-sampled countries,
which were classified into separate groups for marine fisheries,
inland fisheries and aquaculture according to their geographical
location or productivity.
The value added by the fisheries sector as a whole in 2011 was estimated
at more than US$24 billion, 1.26 percent of the GDP of all African
countries. Detailed figures by subsector highlight the relevance
of marine artisanal fisheries and related processing, and also of
inland fisheries, which contribute onethird of the total catches
in African countries. Aquaculture is still developing in Africa
and is mostly
concentrated in a few countries but it already produces an estimated
value of almost US$3 billion per year. As data on licence fees paid
by foreign fleets were not easily available to the national experts
participating in this study, an attempt was also made to estimate
the value of fisheries agreements with Distant Water Fishing Nations
(DWFNs) fishing in the exclusive economic zones of African States.
Considering that 25 percent of all marine catches around Africa
are still by non-African countries, if also these catches were caught
by African States in theory they could generate an additional value
of US$3.3 billion, which is eight times higher than the current
US$0.4 billion African countries earn from fisheries agreements.
the new estimates produced by the study, the fisheries sector as
a whole employs 12.3 million people as full-time fishers or full-time
and part-time processors, representing 2.1 percent of Africas
population of between 15 and 64 years old. Fishers represent half
of all people engaged in the sector, 42.4 percent are processors
and 7.5 percent work in aquaculture. About 27.3 percent of the
people engaged in fisheries and aquaculture are women, with marked
differences in their share among fishers (3.6 percent), processors
(58 percent), and aquaculture workers (4 percent).
OF SMALL SCALE FISHERIES
Allison, E.H.; Andrew, N.J.; Béné, C.; Bianchi, G.;
de Graaf, G.J.; Kalikoski, D.; Mahon. R.; Orensanz, J.M. Towards
integrated assessment and advice in small-scale fisheries: principles
FAO Fisheries and Aquaculture Technical Paper. No. 515. Rome, FAO.
document presents the principles and processes for integrated assessment
and advice in small-scale fisheries. The first chapter discusses
failures of conventional assessment and management approaches. Chapter
2 presents the conceptual origins and principles of integrated assessment
of small-scale fisheries. The framework is then introduced and places
the assessment within the broader planning and management cycle.
The final chapter discusses the implementation of the IAA framework.
TRAINING COURSE ON SAMPLE BASED FISHERIES DATA COLLECTION
de Graaf, G.J.,
Nunoo, F., Ofori Danson, P., Wiafe, G., Lamptey, E. & Bannerman,
P. 2015. International training course in fisheries statistics and
FAO Fisheries and Aquaculture Circular No. 1091. Rome, FAO. 134
the status and trends of capture fisheries, including
socio-economic aspects, is key to sound policy-development, better
decision-making and responsible fisheries management. Inventories
of national data collection systems carried out by the FAO FishCodeSTF
Project indicated that main problems/challenges in the fisheries
monitoring system are: (i) a lack of human and financial resources;
(ii) a lack of capacity/knowledge in fisheries monitoring at local
level; (iii) a lack of appropriate, cost-effective data collection
systems; (iv) a lack of reliable, adequate and accurate information;
and v) gaps in data collection, processing and analysis. Capacity
building in data collection and fisheries statistics is a high priority
for the FAO FishCodeSTF Project. Therefore, FAO in collaboration
with the Department of Oceanography and Fisheries of the University
of Ghana, Accra, developed the International Training Course in
Fisheries Statistics and Data Collection.
objective of the course is to illustrate sampling methods for improving
routine data collection, which can provide the desired precision
of estimates at the lowest possible cost and yet possess a higher
degree of accuracy. The design techniques are based on international
standards, illustrated with the collection of fisheries statistics
and analysis from the region. The specific objectives are: (i) to
introduce basic concepts of the importance of fisheries information;
(ii) to introduce international standards and concepts in fisheries
data collection; (iii) to introduce the basic concepts of sampling
and design of routine fisheries data collection schemes; (iv) to
introduce basic concepts of statistical data analyses; (v) to introduce
basic concepts of data storage and dissemination; and (vi) to provide
practical issues and examples relevant to fisheries statistics and