Considerations About Effective Dissemination Of Improved Fish Strains

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.

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.

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.

This publication is presented in two parts.

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.