Nile tilapia (Oreochromis niloticus) seed production in irrigated rice-fields in Northwest Bangladesh-an approach appropriate for poorer farmers?

Participatory research was conducted with poorer farmers in two communities, Girai (G) and Bahagili (B) in NW Bangladesh to assess the production of Nile tilapia seed in irrigated spring rice-fields. All the selected households (G=15; B=4) had previous experience producing common carp (Cyprinus carpio) in the rice-fields allocated a separate plot in which a deeper area had been excavated for this trial.

Management of broodstock and quality control of fish seed in Hungary

Common carp (Cyprinus carpio) breeding has a long tradition in Hungary. However, recent economic changes in Eastern Europe and new developments in aquaculture necessitated the need for ensuring quality of the brood stock used in hatcheries and the legal and institutional frameworks needed to implement the program. In addition to good research and development programs and gene banking, it became essential to establish an appropriate legal framework, organize, coordinate and control breeding activities, and provide financial support.

A review of carp genetic research and possible approaches to genetic improvement of Asian carps.

Currently available information on all aspects of genetics relevant to improving the production efficiency of carpsunder various farming systems is reviewed. With the virtual closure of the life cycle of many of these carps within the culture environments and a rapid increase in artificial propagation, there is a need to monitor scientifically the broodstock management practices and possible genetic changes taking place in the cultured stocks.

Review of the spawning requirements and feeding ecology of silver carp (Hypophthalmichthys molitrix) and reevaluation of its use in fisheries and aquaculture.

In this paper, available fisheries and aquaculture data on silver carp are reviewed from conservation, fish¬eries management. and aquaculture production perspectives in order to reevaluate its perfor¬mance with respect to the original rationales for its use in fisheries management, its role in aqua-culture pond ecosystems, and possible impacts of naturalization in new environments.

Transgenic fish: risks and benefits

Advocates of transgenesis consider it an effective means of improving the productivity of aquatic animals. Opponents see it as a threat to both the environment and human health. This is a challenging area because important traits in fish are complex and controlled by multiple genes. Nevertheless, some transgenic lines of "high-growth" tilapia, salmon and carp are nearing the stage at which they could be considered for commercial production.

Accounting for genotype by environment interaction in economic appraisal of genetic improvement programs in common carp Cyprinus carpio

In this study we examine effects of genotype by environment (G×E) interaction due to re-ranking and scaling effects on economic benefit (EB) and benefit to cost ratio (BCR) from a genetic improvement program in common carp at a national level in Vietnam. A discount approach was used for the economic evaluation over a 10 year time horizon. G×E interaction resulting from scaling effects generally had a negligible impact on EB and BCR. However, both EB and BCR decreased with the magnitude of the G×E (i.e.


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