Considerations About Effective Dissemination Of Improved Fish Strains PDF Download
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Author | : Ponzoni |
Publisher | : WorldFish |
Total Pages | : 16 |
Release | : |
Genre | : |
ISBN | : |
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Author | : Ponzoni, R.W. |
Publisher | : WorldFish |
Total Pages | : 22 |
Release | : |
Genre | : |
ISBN | : |
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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. |
Total Pages | : 196 |
Release | : |
Genre | : |
ISBN | : 9251389276 |
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Author | : Chikowi, Christopher T. M. |
Publisher | : Intl Food Policy Res Inst |
Total Pages | : 33 |
Release | : 2020-01-09 |
Genre | : Political Science |
ISBN | : |
Download Consumer choices and demand for tilapia in urban Malawi: What are the complementarities and trade-offs? Book in PDF, ePub and Kindle
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 |
Total Pages | : 57 |
Release | : 2006 |
Genre | : Aquatic animals |
ISBN | : 9832346533 |
Download Development of Aquatic Animal Genetic Improvement and Dissemination Programs Book in PDF, ePub and Kindle
Author | : Sena S. De Silva |
Publisher | : IDRC |
Total Pages | : 230 |
Release | : 2009-10-14 |
Genre | : Nature |
ISBN | : 9048130859 |
Download Success Stories in Asian Aquaculture Book in PDF, ePub and Kindle
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 | : Trygve Gjedrem |
Publisher | : Springer Science & Business Media |
Total Pages | : 221 |
Release | : 2010-03-17 |
Genre | : Science |
ISBN | : 9048127734 |
Download Selective Breeding in Aquaculture: an Introduction Book in PDF, ePub and Kindle
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 | : Food and Agriculture Organization of the United Nations |
Publisher | : Food & Agriculture Org. |
Total Pages | : 670 |
Release | : 2007 |
Genre | : Business & Economics |
ISBN | : 9789251058954 |
Download Assessment of Freshwater Fish Seed Resources for Sustainable Aquaculture Book in PDF, ePub and Kindle
This publication is presented in two parts.
Author | : Raoul W. Ponzoni |
Publisher | : WorldFish |
Total Pages | : 138 |
Release | : 2008 |
Genre | : Clarias gariepinus |
ISBN | : 9832346681 |
Download Proceedings of a Workshop on the Development of a Genetic Improvement Program for African Catfish Clarias Gariepinus Book in PDF, ePub and Kindle
Author | : David J. Penman |
Publisher | : WorldFish |
Total Pages | : 157 |
Release | : 2005 |
Genre | : Aquaculture |
ISBN | : 9832346355 |
Download Carp genetic resources for aquaculture in Asia Book in PDF, ePub and Kindle
There are over 1300 species of cyprinids in Asia, and these are utilized by people for food (capture fisheries and aquaculture) and as ornamental species. This publication focuses on cyprinid species that are bred in hatcheries and used in aquaculture and restocking activities. Introduced and threatened species of cyprinids in Asia are also discussed. We are well aware that we have not covered many other cyprinid species that are utilized by people in Asia in various ways: wild species in capture fisheries, self-recruiting species in aquaculture ponds and other water bodies, and aquarist species.