Author: R. C. M. CrulPublisher:
ISBN: 9780119410952
Category : Fisheries
Languages : en
Pages : 21
Book Description
Database on the Inland Fishery Resources of Africa (DIFRA)
Author: R. C. M. CrulPublisher:
ISBN: 9780119410952
Category : Fisheries
Languages : en
Pages : 21
Book Description
Report of the Advisory Roundtable on the Assessment of Inland Fisheries
Author: Food and Agriculture Organization of the United NationsPublisher: Food & Agriculture Org.
ISBN: 925131098X
Category : Technology & Engineering
Languages : en
Pages : 47
Book Description
The two and a half day Advisory Roundtable was convened to contribute to FAO’s response to the request by the 32nd Session of the Committee on Fisheries (COFI), to advise FAO on its approach to developing a more comprehensive report on methods and data and analytical approach, which could be used to provide a credible, objective and replicable assessment of inland fisheries; and ii) provide guidance on tools that could be provided to member states seeking advice with respect to assessing the status of their inland fisheries (yield/production, threats & drivers), predicting future impacts and how to quantify the effect of mitigation/adaptation measures on fisheries. The roundtable reviewed and discussed the background that had led up to the meeting to scrutinize the purpose of an assessment and the scope of coverage and how this could be used to determine the status of inland fisheries. It further developed the criteria to conduct such an assessment, and then attempted to apply the approach to a number of basins. This practical exercise was based on concrete examples from countries or basins with which the experts were familiar. It was concluded by the roundtable, that the use of a dual index approach is the right way to go, and that it can be used to assess fisheries both at the national, basin, regional and global levels although different levels of resolution will be required and may thus have somewhat different data requirements. Adding a valuation element will direct investment towards the fisheries that provides most benefit to society in the context of the priorities set at the national level. At the national level, data may include yields, catches, threats, and measures that can be used to estimate future adaptive capacity. For global level analysis an index approach will be necessary relying on “big” data. Any information system should be useful to serve, first and foremost, the countries that collect/analyse and provide the data. Reports to FAO that could be compiled into a global picture of the state of inland fisheries would be a value added product of this process. The national reports would also have utility in reporting on progress towards the Sustainable Development Goals/Aichi Targets.
A Strategic Reassessment of Fish Farming Potential in Africa
Author: José Aguilar-ManjarrezPublisher: Food & Agriculture Org.
ISBN: 9789251041390
Category : Business & Economics
Languages : en
Pages : 196
Book Description
"(Reprint. First published in 1998) The present study is an update of an earlier assessment of warm-water fish farming potential in Africa, by Kapetsky (1994). The objective of this study was to assess locations and areal expanses that have potential for warm-water and temperate-water fish farming in continental Africa. The study was based on previous estimates for Africa by the above author, and on estimates of potential for warm-water and temperate-water fish farming in Latin America by Kapetsky and Nath (1997). However, a number of refinements have been made. The most important refinement was that new data allowed a sevenfold increase in resolution over that used in the previous Africa study, and a twofold increase over that of Latin America (i.e. to 3 arc minutes, equivalent to 5 km x 5 km grids at the equator), making the present results more usable in order to assess fish farming potential at the national level. A geographical information system (GIS) was used to evaluate each grid cell on the basis of several land-quality factors important for fish-farm development and operation regardless of the fish species used. Protected areas, large inland water bodies and major cities were identified as constraint areas, and were excluded from any fish farming development altogether. Small-scale fish farming potential was assessed on the basis of four factors: water requirement from ponds due to evaporation and seepage, soil and terrain suitability for pond construction based on a variety of soil attributes and slopes, availability of livestock wastes and agricultural by-products as feed inputs based on manure and crop potential, and farm-gate sales as a function of population density. For commercial farming, an urban market potential criterion was added based on population size of urban centres and travel time proximity. Both small-scale and commercial models were developed by weighting the above factors using a multi-criteria decision-making procedure. A bioenergetics model was incorporated into the GIS to predict, for the first time, fish yields across Africa. A gridded water temperature data set was used as input to a bioenergetics model to predict number of crops per year for the following three species: Nile tilapia (Oreochromis niloticus), African catfish (Clarias gariepinus) and Common carp (Cyprinus carpio). Similar analytical approaches to those by Kapetsky and Nath (1997) were followed in the yield estimation. However, different specifications were used for small-scale and commercial farming scenarios in order to reflect the types of culture practices found in Africa. Moreover, the fish growth simulation model, documented in Kapetsky and Nath (1997), was refined to enable consideration of feed quality and high fish biomass in ponds. The small-scale and commercial models derived from the land-quality evaluation were combined with the yield potential of each grid cell for each of the three fish species to show the coincidence of each land-quality suitability class with a range of yield potentials. Finally, the land quality-fish yield potential combinations were put together to show where the fish farming potential coincided for the three fish species."
Source Book for the Inland Fishery Resources of Africa
Author: J.-P. vanden BosschePublisher: Food & Agriculture Org.
ISBN: 9789251029831
Category : Technology & Engineering
Languages : en
Pages : 432
Book Description
Review of the State of World Fishery Resources
Author: Food and Agriculture Organization of the United NationsPublisher:
ISBN:
Category : Aquacultural engineering
Languages : en
Pages : 72
Book Description
The objective of this review is to present a broad view of the state of inland capture fisheries as of 2001. Status and trends are reported along with coverage of selected sections on the impact of dams on fisheries, fisheries in rice-based ecosystems, database on African water resources, indices of human development and environmental sustainability, and new approaches to improving inland fishery information. A floppy disk containing the figures presented in this circular is enclosed.--Publisher's description.
Source Book for the Inland Fishery Resources of Africa
Author: J.-P. vanden BosschePublisher: Food & Agriculture Org.
ISBN:
Category : Fisheries
Languages : en
Pages : 436
Book Description
Support Aquaculture Development in Africa
Author: A. G. CochePublisher:
ISBN:
Category : Aquaculture
Languages : en
Pages : 100
Book Description
Source Book for the Inland Fishery Resources of Africa
Author: J.-P. vanden BosschePublisher: Food & Agriculture Organization of the UN (FAO)
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 248
Book Description
FAO Publications Catalogue
Author: Food and Agriculture Organization of the United NationsPublisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 292
Book Description
Models for Estimating Potential Fish Yields of African Inland Waters
Author: R. C. M. CrulPublisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 36
Book Description