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George Town, Malaysia

The WorldFish Center, a CGIAR Consortium Research Center, is an international, non-profit research organization dedicated to reducing poverty and hunger by improving fisheries and aquaculture. CGIAR is a global research partnership that unites organizations engaged in research for sustainable development. CGIAR research is dedicated to reducing rural poverty, increasing food security, improving human health and nutrition, and ensuring more sustainable management of natural resources. Wikipedia.

Ziv G.,Princeton University | Ziv G.,Stanford University | Baran E.,Worldfish Center | Nam S.,Inland Fisheries Research and Development Institute | And 2 more authors.
Proceedings of the National Academy of Sciences of the United States of America | Year: 2012

The Mekong River Basin, site of the biggest inland fishery in the world, is undergoing massive hydropower development. Planned dams will block critical fish migration routes between the river's downstream floodplains and upstream tributaries. Here we estimate fish biomass and biodiversity losses in numerous damming scenarios using a simple ecological model of fish migration. Our framework allows detailing trade-offs between dam locations, power production, and impacts on fish resources. We find that the completion of 78 dams on tributaries, which have not previously been subject to strategic analysis, would have catastrophic impacts on fish productivity and biodiversity. Our results argue for reassessment of several dams planned, and call for a new regional agreement on tributary development of the Mekong River Basin. Source

Brummett R.E.,The World Bank | Beveridge M.C.M.,Worldfish Center | Cowx I.G.,University of Hull
Fish and Fisheries | Year: 2013

Freshwater allocation in an environment of increasing demand and declining quality and availability is a major societal challenge. While biodiversity and the needs of local communities are often in congruence, the over-riding necessity of meeting national demands for power, food and, increasingly, mitigation of the hydrological effects of climate change, often supersedes these. Sophisticated models of ecosystem function to establish environmental flows are difficult to implement and consequently have generally failed to reduce rates of biodiversity and habitat loss, resulting in disenfranchisement of local communities resulting from dam construction and water abstraction for industry and agriculture. There are no agreed standards upon which a fairer allocation of resources can be made and thus a pragmatic approach to the resolution of these conflicts is clearly needed. While having generally negative impacts on biodiversity and traditional lifestyles, creation of new infrastructure and active management generates national economic growth and much-needed employment. Intensification of usage in watersheds already expropriated for human enterprise can spare land needed for the biodiversity that will fuel adaptation for the future. Taking advantage of a range of mitigation technologies and building their cost into the investment plans for water management infrastructure can improve the cost/benefit ratio of water control infrastructure and may be a more practical and efficacious approach to the valuation of fisheries and the maintenance of other essential services from functional aquatic ecosystems. © 2012 John Wiley & Sons Ltd. Source

Beare D.,Worldfish Center | MacHiels M.,IMARES
ICES Journal of Marine Science | Year: 2012

Average towing speed by Dutch beam trawlermen has fallen substantially between 2002 and 2009. Changes in towing speed are related to changes in oil price. The price of their valuable main target species (sole, Solea vulgaris) did not influence towing speed. © 2012 International Council for the Exploration of the Sea. Source

Seed production of Nile tilapia (Oreochromis niloticus L.) in nylon mesh net cages (hapas) was tested through a participatory on-farm trial with households in NW Bangladesh. A total of 43 households with small ponds (0.04-0.08ha) located close to the homesteads were sampled from poor to medium social groups in three communities: Tarala Banara (TB), Dewnaghata (DW) and Dola Para (DP). Broodfish of GIFT strain Nile tilapia (12 female and 6 male; 60g size) were stocked in a single spawning hapa (3×2×1m). Swim-up fry were collected from breeding hapas at 15day intervals and stocked alternately in two nursing hapas (1.5×1×1m). With the exception of 15 households at DP in which flooding caused loss of fish, most of the households in TB and DW produced tilapia fry from hapas for 4-5months in addition to the usual production of foodfish/fingerlings in their ponds. Mean swim-up fry production in TB and DW was 5185±3764 and 3415±1536fryhousehold-1, leading to nursed fry production of 2708±1967 and 1380±734fryhousehold-1 respectively. Nursed fry were sold (70%) or re-stocked (30%) for foodfish production in the participants' own ponds. Only households with perennial ponds that were able to hold and rear tilapia broodfish (25% of total households at TB and DW) successfully produced seed in Year 2, but such households started earlier in the season (March) and achieved significantly higher productivity than the previous year. Hapa productivity was impacted by local soil type, presence of shade, depth of mud and level of drainage inputs; more fry were produced in ponds based on sandy and sandy-loam soils with less overhanging vegetation and shade, lower levels of turbidity and benthic mud, and no drainage connections with tube wells or surface run-off. Poorer households were more successful overall and tended to prioritise sale of fry over retention for foodfish culture Households engaged in ancillary fry trading and/or nursery businesses also tended to be relatively successful. Between 8 and 20 customers were supplied by each hapa operator, indicating the broader impacts of local seed production on grow-out for foodfish production. © 2011 Elsevier B.V. Source

Ponzoni R.W.,Worldfish Center | Hulata G.,Israel Agricultural Research Organization
Aquaculture Research | Year: 2014

Genetic parameters and selection responses were obtained for harvest body weight of blue tilapia (Oreochromis aureus) from data collected over three generations in a selected population. A total of 18 194 records representing 186 sires and 201 dams were used in the analysis. Within generation heritability estimates for harvest body weight ranged from 0.18 to 0.58. When data from more than one generation were included in the analysis, heritability estimates became more stable (0.33-0.40) and it was 0.33 when all data were included in the analysis. The common full-sib effect accounted for 10% of the phenotypic variance in the full data set. Heritability for survival from stocking to harvest was estimated at 0.01 and 0.09 in actual units (fitting an animal model) and in the logit (sire model) scale respectively. The genetic correlation between harvest body weight and survival was 0.22 and not significantly different from zero. The total selection response for harvest body weight over the three generations of selection measured as the difference between least-squares means of selected and control lines was 17.7%. The corresponding figure when response was measured as the difference between mean breeding values of selected and control lines was 19.6%. The average inbreeding coefficient was 0.003 after three generations of selection. These results indicate that there are good prospects for the genetic improvement of harvest body weight in blue tilapia. © 2012 John Wiley & Sons Ltd. Source

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