Proceedings of a Workshop on the Development of a Genetic Improvement Program for African Catfish Clarias Gariepinus PDF Download
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Author: Raoul W. Ponzoni
Publisher: WorldFish
ISBN: 9832346681
Category : Clarias gariepinus
Languages : en
Pages : 138
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Book Description
Author: Raoul W. Ponzoni
Publisher: WorldFish
ISBN: 9832346681
Category : Clarias gariepinus
Languages : en
Pages : 138
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Book Description
Author: Stephen A. Dueppen
Publisher: Cotsen Institute of Archaeology Press
ISBN: 195044631X
Category : History
Languages : en
Pages : 328
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Book Description
Kirikongo is an archaeological site composed of thirteen remarkably well-preserved discrete mounds occupied continually from the early first to the mid second millennium AD. It spans a dynamic era that saw the growth of large settlement communities and regional socio-political formations, development of economic specializations, intensification in interregional commercial networks, and the effects of the Black Death pandemic. The extraordinary preservation of architectural units, activity areas and industrial zones provides a unique opportunity to discern the cultural practices that created stratified mounds (tells) in this part of West Africa. Building from a new detailed zooarchaeological analysis and refinements in stratigraphic precision, this book argues that repeated ritual activity was a significant factor in the accumulation of stratified archaeological deposits. The book details consistencies in form and content of discrete loci containing animal bones, food remains, and broken and unbroken objects and suggests that these are the remnants of sequential ancestor shrines created when domestic spaces were converted to tombs or dedicated mortuary monuments were constructed. Continuities and transformations in ancestral rituals at Kirikongo inform on earlier West African ritual practices from the second millennium BC as well as political and social transformations at the site. More broadly, this case study provides new insights on anthropogenic mound (tell) formation processes, social zooarchaeology, material culture theory, historical ontology, and the analysis of ritual and religion in the archaeological record.
Author: CGIAR Research Program on Aquatic Agricultural Systems
Publisher: WorldFish
ISBN:
Category :
Languages : en
Pages : 39
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Book Description
Author:
Publisher:
ISBN:
Category : Rural development
Languages : en
Pages : 400
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Book Description
Author:
Publisher:
ISBN:
Category : Aquaculture
Languages : en
Pages : 272
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Book Description
Author:
Publisher:
ISBN:
Category : Aquaculture
Languages : en
Pages : 928
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Book Description
Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9251316082
Category : Technology & Engineering
Languages : en
Pages : 291
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Book Description
The conservation, sustainable use and development of aquatic genetic resources (AqGR) is critical to the future supply of fish. The State of the World’s Aquatic Genetic Resources for Food and Agriculture is the first ever global assessment of these resources, with the scope of this first Report being limited to cultured AqGR and their wild relatives, within national jurisdiction. The Report draws on 92 reports from FAO member countries and five specially commissioned thematic background studies. The reporting countries are responsible for 96 percent of global aquaculture production. The Report sets the context with a review of the state of world’s aquaculture and fisheries and includes overviews of the uses and exchanges of AqGR, the drivers and trends impacting AqGR and the extent of ex situ and in situ conservation efforts. The Report also investigates the roles of stakeholders in AqGR and the levels of activity in research, education, training and extension, and reviews national policies and the levels of regional and international cooperation on AqGR. Finally, needs and challenges are assessed in the context of the findings from the data collected from the countries. The Report represents a snapshot of the present status of AqGR and forms a valuable technical reference document, particularly where it presents standardized key terminology and concepts.
Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9789251058954
Category : Business & Economics
Languages : en
Pages : 670
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Book Description
This publication is presented in two parts.
Author: Gertjan de Graaf
Publisher: Conran Octopus
ISBN:
Category : Catfish fisheries
Languages : en
Pages : 84
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Book Description
The manual is based on the practical experiences of the authors on the artificial reproduction and pond rearing of the African catfish Clarias gariepinus within FAO field projects in the Central African Republic, the Republic of the Congo, Kenya and Nigeria. The manual is divided into five major sections dealing with: 1) general biology, including natural feeding habits and reproduction; 2) artificial reproduction, including induced propagation without and through hormone injection; 3) fry nursing in earthen ponds, including pond preparation, fertilization, feeding and management; 4) monoculture, including feeding methods; and 5) polyculture with Tilapia. In addition, information is provided concerning the economics of different fingerling and grow-out farming practices in Africa, and concerning diseases and hybridization.
Author: Trygve Gjedrem
Publisher: Springer Science & Business Media
ISBN: 9048127734
Category : Science
Languages : en
Pages : 221
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Book Description
The foundation of quantitative genetics theory was developed during the last century and facilitated many successful breeding programs for cultivated plants and t- restrial livestock. The results have been almost universally impressive, and today nearly all agricultural production utilises genetically improved seed and animals. The aquaculture industry can learn a great deal from these experiences, because the basic theory behind selective breeding is the same for all species. The ?rst published selection experiments in aquaculture started in 1920 s to improve disease resistance in ?sh, but it was not before the 1970 s that the ?rst family based breeding program was initiated for Atlantic salmon in Norway by AKVAFORSK. Unfortunately, the subsequent implementation of selective breeding on a wider scale in aquaculture has been slow, and despite the dramatic gains that have been demonstrated in a number of species, less than 10% of world aquaculture production is currently based on improved stocks. For the long-term sustainability of aquaculture production, there is an urgent need to develop and implement e- cient breeding programs for all species under commercial production. The ability for aquaculture to successfully meet the demands of an ever increasing human p- ulation, will rely on genetically improved stocks that utilise feed, water and land resources in an ef?cient way. Technological advances like genome sequences of aquaculture species, and advanced molecular methods means that there are new and exciting prospects for building on these well-established methods into the future.
