Considerations about effective dissemination of improved fish strains PDF Download

Author: Ponzoni
Publisher: WorldFish
ISBN:
Category :
Languages : en
Pages : 16

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Author: Ponzoni, R.W.
Publisher: WorldFish
ISBN:
Category :
Languages : ar
Pages : 22

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Book Description
ÿAquaculture production systems in developing countries are largely based on the use of unimproved species and strains. As knowledge and experience are accumulated in relation to the management, feeding and animal health issues of such production systems, the availability of genetically more productive stock becomes imperative in order to more effectively use resources. For instance, there is little point in providing ideal water conditions and optimum feed quality to fish that do not have the potential to grow faster and to be harvested on time, providing a product of the desired quality. Refinements in the production system and improvement of the stock used must progress hand in hand. In this paper we deal separately with genetic and non-genetic issues pertaining to the multiplication and dissemination of improved strains. The separation is somewhat arbitrary, and as will be evident from our discussion, there is frequent interaction between the two.

Author:
Publisher: Food & Agriculture Org.
ISBN: 9251389276
Category :
Languages : en
Pages : 196

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Author: Chikowi, Christopher T. M.
Publisher: Intl Food Policy Res Inst
ISBN:
Category : Political Science
Languages : en
Pages : 33

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Despite concerted efforts to develop the fisheries sector in many developing countries, fish demand remains poorly understood due to weak and fragmented domestic markets, particularly in Africa south of the Sahara. An important area that affects the development of the fishery sector is limited understanding of how the choice between different fish products is affected by the socioeconomic characteristics of consumers, marketing factors and fish-specific attributes. Previous studies in Malawi have assessed consumer choice and demand for fish in general, without considering species-specific consumer choices. This paper analyzes consumer choices and demand for two species of tilapia, Lake Malawi Oreochromis (Nyasalapia) spp. (Ny) and Oreochromis shiranus (Os), in unprocessed and processed form, in urban Malawi. We use data collected from a sample of 584 urban households in Malawi’s two major cities, Blantyre and Lilongwe. Multivariate probit and seemingly unrelated regression models are employed to analyze the correlates of consumer choice and demand for tilapia products. Even though most consumers chose farmed tilapia (Os) over the wild tilapia (Ny), our results indicate trade-offs in choice but complementarities in demand for unprocessed and processed tilapia products. We find that the correlates of choice are not the same as correlates of demand for tilapia products. This is explained by heterogenous consumer profiles, market conditions, and tilapia trait descriptors. Developing robust tilapia value chains requires exploiting these complementarities and trade-offs, policy support to boost tilapia production, and reducing its relative caloric price to consumers. These measures will contribute to increased consumer demand. More generally fish breeding programs should also link breeding objectives to consumer choices and demand for fisheries’ products, particularly considering rarely examined fish at-tributes such as its nutritive value and body texture.

Author:
Publisher: WorldFish
ISBN: 9832346533
Category : Aquatic animals
Languages : en
Pages : 57

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Author: Trygve Gjedrem
Publisher: Springer Science & Business Media
ISBN: 9048127734
Category : Science
Languages : en
Pages : 221

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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.

Author: Sena S. De Silva
Publisher: IDRC
ISBN: 9048130859
Category : Nature
Languages : en
Pages : 230

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This book examines how the adaptability and innovation of small-scale aquaculture farmers have been crucial to success in the region. It describes the relationship between aquaculture development in Asia to natural systems, social conditions and economics.

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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This publication is presented in two parts.

Author: Raoul W. Ponzoni
Publisher: WorldFish
ISBN: 9832346681
Category : Clarias gariepinus
Languages : en
Pages : 138

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Author: Boston Pickett
Publisher: Scientific e-Resources
ISBN: 1839472642
Category :
Languages : en
Pages : 308

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Book Description
The significance of Biotechnology in the field of fisheries and aquaculture is investigated in view of distributed writing. Aquaculture is the cultivating and farming of oceanic life forms and as it is the quickest developing sustenance area on the planet with its expanding part for economy and safe nourishment system of nations. Because of the proceeding with exhaustion of the fish stocks, cultivating of amphibian life forms, for example, angle, shellfish, mollusks and sea-going plants, is presently a considerable worldwide industry providing a critical extent of the oceanic items devoured. Deficiency in nourishment supply and high costs are the conceivable vital dangers later on, and sea-going items are the important wellsprings of protein and fundamental supplement segments for worldwide sustenance security and wiping out ailing health. Aquaculture additionally assumes an imperative part in country economies through the making of new occupations. In these cases, aquaculture yields should be improved a few overlay to meet the rising requests for angle and other sea-going items in coming years. Biotechnology choices appear to be great potential for expanding water social efficiency, nourishment security and ecological quality around the world. Therefore, this book talked about the significance of biotechnology in aquaculture, and arrangements for the ecologically stable utilize and administration of water social biotechnology in feasible improvement of fisheries.