Milkfish production dualism in the Philippines: a multidisciplinary perspective on continuous low yields and constraints to aquaculture development.

Determines and measures the constraints to the adoption of more intensive fertilizer application rates among Philippine milkfish farmers. Hypothesized 56 explanatory variables, categorized into socioeconomic, institutional, physical and biotechnical parameters to explain variations in fertilizer use. Focused on farmers' perceptions of constraints. Data from 447 milkfish farmers in seven provinces and from a previous survey of 324 farmers in seven provinces.

Capacity for developing and managing genetically improved strains of tilapia in Africa including broodstock management and quarantine

Human and institutional capacities for developing and managing genetically improved tilapia in Africa are discussed. Discussions are related particularly to the status of hatcheries, rearing facilities, research and extension services, training in genetic enhancement, and fish transfer in major aquaculture countries in Africa. The leading aquaculture producing countries are Egypt and Nigeria along with nine other countries with some intermediate levels of fi sh production. The availability of quality fry and fingerlings constitutes a major constraint.

Adoption and economics of silver barb (Puntius gonionotus) culture in seasonal waters in Bangladesh.

This report is the outcome of a research undertaken during the implementation of Agricultural Research Project II (Supplement) by ICLARM-Bangladesh in collaboration with several agencies, to evaluate the socioeconomic viability and the farmers' assessment of culturing silver barb using ICLARM technology in different agroclimatic zones.

Genetic diversity and selective breeding of red common carps in China.

China has a very rich genetic diversity in common carp (Cyprinus carpio) and the red common carp plays an important role in Chinese aquaculture and genetic studies. Selective breeding, particularly crossbreeding has been applied successfully to red common carps in China, and the products of these efforts have been in commercial use since the 1970s. However, knowledge of the quantitative and molecular genetics of these carps is limited.

The evolution of aquaculture in African rural and economic development

In Africa, aquaculture has developed only recently and so far has made only a small contribution to economic development and food security. We review developments and identify constraints to the expansion of aquaculture in economic and rural development at the continental, national and farm levels. Past development initiatives failed to achieve sustainable increases in production. In contrast, a growing number of smallholder farmers in many countries have been adopting and adapting pond aquaculture to their existing farming systems and slowly increasing their production efficiency.

Impact of long-term training and extension support on small-scale carp polyculture farms of Bangladesh

One of the unique features of the Development of Sustainable Aquaculture Project of the WorldFish Center, Bangladesh, was the provision of 3 y of continuous training and extension in support of the fish farmers involved. It was expected that the long-term support would make a significant contribution to boosting production and incomes as well as sustainability. The article demonstrates the impact of the training and extension support to small-scale carp polyculture farmers in terms of productivity, profitability, and efficiency.

Development of sustainable aquaculture project: progress report (1 January 2003 - 31 March 2003)

The Development of Sustainable Aquaculture Project (DSAP) was authorized by USAID under the Cooperative Agreement # 388-A-00-00-00068-00 on 28 June 2000. This technical progress report covers activities for the three months of the project, 1 April 2003 through 30 June 2003. The main thrust of the Development of Sustainable Aquaculture Project is to sponsor on-farm aquaculture production demonstrations implemented through co-operating NGO partners.

Simulation of optimal harvesting strategies for small-scale mixed-sex tilapia (Oreochromis shiranus Boulenger 1896) ponds using a bio-economic model

A cohort-based bio-economic biomass growth and economic model, validated with data from experiments conducted in Malawi, was used to identify an optimal harvesting strategy for mixed-sex tilapia ponds.Three harvesting scenarios (baseline, economic optimum time +10 days and economic optimum time) were used. In each harvesting scenario four options were explored: (i) no further harvest, harvest every (ii) 60 days, (iii) 90 days and (iv) 120 days after initial harvest.

Fisheries and water productivity in tropical river basins: Enhancing food security and livelihoods by managing water for fish.

Faced with growing pressure upon freshwater resources, increased water productivity in agriculture is essential. Efforts to do so however need to consider the wider role of water in sustaining food production. This paper considers the importance of water management in sustaining fish production in tropical river basins, and the potential for enhancing food production and income to farmers by integrating fish production into some farming systems. Specific examples from selected river systems and irrigated farming systems in Africa and Asia are provided.


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