Status of Fish Stocks and Fisheries of Thirteen Medium-sized African Reservoirs PDF Download

Author: M. van der Knaap
Publisher: Food & Agriculture Org.
ISBN: 9789251035818
Category : Technology & Engineering
Languages : en
Pages : 124

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Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9789251046944
Category : Business & Economics
Languages : en
Pages : 180

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The importance of free longitudinal passage of river fauna is stressed.

Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9251092192
Category : Nature
Languages : en
Pages : 64

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Drylands cover more than half sub-Saharan Africa and are home to nearly 50 percent of the region's people. This review documents resilience to climatic variability of fish resources in the sub-Saharan drylands. It also examines the potential for increasing their supply through improved use of available bodies of water, especially small reservoirs.

Author: José Aguilar-Manjarrez
Publisher: Food & Agriculture Org.
ISBN: 9789251041390
Category : Business & Economics
Languages : en
Pages : 196

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"(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."

Author: OECD
Publisher: OECD Publishing
ISBN: 9264289623
Category :
Languages : en
Pages : 164

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Focused on a specific case of the Shardara MPWI located in Low Syr-Darya Basin, South Kazakhstan and the Kyzyl-Orda oblasts (provinces) of Kazakhstan, this report looks at the choice and design of MPWI investment strategies that ensure a high economic return on investments and potential bankability.

Author:
Publisher: Academic Press
ISBN: 0123706262
Category : Science
Languages : en
Pages : 2589

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Inland aquatic habitats occur world-wide at all scales from marshes, swamps and temporary puddles, to ponds, lakes and inland seas; from streams and creeks to rolling rivers. Vital for biological diversity, ecosystem function and as resources for human life, commerce and leisure, inland waters are a vital component of life on Earth. The Encyclopedia of Inland Waters describes and explains all the basic features of the subject, from water chemistry and physics, to the biology of aquatic creatures and the complex function and balance of aquatic ecosystems of varying size and complexity. Used and abused as an essential resource, it is vital that we understand and manage them as much as we appreciate and enjoy them. This extraordinary reference brings together the very best research to provide the basic and advanced information necessary for scientists to understand these ecosystems – and for water resource managers and consultants to manage and protect them for future generations. Encyclopedic reference to Limnology - a key core subject in ecology taught as a specialist course in universitiesOver 240 topic related articles cover the field Gene Likens is a renowned limnologist and conservationist, Emeritus Director of the Institute of Ecosystems Research, elected member of the American Philosophical Society and recipient of the 2001 National Medal of Science Subject Section Editors and authors include the very best research workers in the field

Author: Penelope Campbell
Publisher: Transaction Publishers
ISBN: 1412852544
Category : Social Science
Languages : en
Pages : 247

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Africare is a US-based non-profit organization specializing in development aid for Africa. It is also the oldest and largest African-American led organization in the development field. Since its founding in 1970, Africare has delivered more than $710 million in assistance through over 2,500 projects to thirty-six African countries. The organization employs over 1,000 people, largely indigenous to the countries affected. This is a study in leadership and competing African and American black interests. Africare has sought to become the leading voice speaking on Africa within the US, a goal more difficult to attain than becoming the premier NGO in Africa. Sources of opinion and channels of expression about American policy in Africa are fragmented. They do not have name recognition or influential sponsors. There is poor coverage of African affairs in the US, except for key, often tragic, events. Africare has a heritage and has filled a niche in American society. Penelope Campbell argues that unless the organization reclaims these unique assets, it may lose the distinctiveness enabling its survival. The challenge for Africare is spreading its story and message. The author raises disturbing fundamental issues. Has foreign aid become such an industry that the patient is not allowed to get well? As the military cannot afford peace, it seems the world cannot afford the cessation of poverty. Campbell argues that success in Africa has been elusive not because of the failures of development organizations, but the magnitude of the issues involved. The author presents a convincing case for aid to Africa, the pitfalls involved, and for Africare's potential as a leader in meeting the continent's needs.

Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 628

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Author: A. G. Coche
Publisher:
ISBN:
Category : Aquaculture
Languages : en
Pages : 100

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Author: Fisheries Society of Nigeria. Annual Conference
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 948

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