WorldFish Digital Repository
WorldFish research is regarded as international public goods, and we are committed to the widespread dissemination of all our information products. One of the organizational objectives of WorldFish is to make all of its products open. This is in line with both the Center’s Research Data Management and Open Access Policy and the CGIAR Open Access and Data Management Policy. Opening our research, including publications, data and tools, ensures that more people can read and apply our research findings, thereby increasing the efficiency, reach and impact of our work.
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Rohu (Labeo rohita) is a major aquaculture species in Bangladesh, but poor broodstock management has compromised seed quality and growth performance. To address this, WorldFish launched a genetic improvement program in 2012, yet the on-farm performance of the widely available third generation (G3) rohu remains poorly studied. This study aimed to evaluate and compare the growth and profitability of G3 rohu and commercial local rohu under typical smallholder pond polyculture systems in Bangladesh. A total of 120 ponds across two locations were randomly assigned to Selected (30 per location, G3 rohu) or Control (30 per location, local rohu), with rohu stocked at an average of 2470 ha−1 in typical smallholder polyculture systems alongside 5287 ha−1 of other cocultured species. The study was conducted over a full production cycle from July 2023 to March 2024, and differences in performance were assessed using multivariate regression and ANOVA models. Water quality remained within acceptable ranges for aquaculture, despite fluctuations. The Selected rohu demonstrated significantly higher (p ≤ 0.05) harvest weight, weight gain, survival rate, and specific growth rate (SGR), growing 32.6% faster than Control rohu. Productivity of cocultured species did not differ significantly (p ≥ 0.05) between ponds with Selected or Control rohu. Furthermore, G3 rohu yielded significantly higher returns per ha than local rohu, with total productivity, gross revenue, gross margin, net margin, and benefit–cost ratios (BCRs) all significantly higher (p ≤ 0.05) in ponds with Selected rohu. Regression analysis identified pond size, commercial feed use, inorganic fertilization, and stocking density as positive drivers of rohu productivity, whereas pond age had negative effects. Findings are based on data from two districts in southern Bangladesh and may vary elsewhere depending on local farming intensity and management practices. These results suggest that wider dissemination of genetically improved fingerlings, coupled with improved pond management, could enhance smallholder productivity and profitability in Bangladesh.
The Development and Scaling of Sustainable Feeds for Resilient Aquatic Food Systems in Sub-Saharan
Africa (FASA) project aims to develop low-cost, highly nutritious fish feeds based on novel ingredients
and enable 5000 smallholder fish farmers in three countries in Sub-Saharan Africa to test and adopt
these ingredients and feeds. This annual progress report captures the highlights of the implementation
of the project from January to December 2024 under the 5-year grant agreement (2022– 2027) with the
Norwegian Agency for Development Cooperation (Norad). The report provides information on the project’s
background, implementation progress and constraints, expenditures, physical progress by component and
output, communication activities, and innovative approaches or achievements, as well as priorities for 2025.
ECOFISH II (2019-2024), a USAID-funded project led by WorldFish in collaboration with the Department of Fisheries (DOF), aimed to enhance the resilience of Bangladesh’s coastal fisheries and communities. Building on the ECOFISHBD, the project supported 72,000 women, youth, and fishers from 15,010 coastal artisanal fishing households, with a focus on those impacted by the Rohingya crisis. ECOFISH II improved ecosystem health by engaging 140 local youth as blue guards (BGs) to combat ghost gears and plastics. It also advanced scientific research on fish larvae, salinity impacts on fish diversity, seasonal water quality, biodiversity, and the role of phytoplankton in hilsa nutrition. The project assessed various aspects of marine conservation, including MPA suitability, tourism impacts on ghost crabs, small-scale fisheries in Nijhum Dwip, riverine catfish hotspots, and non-conventional fishery products. Catch data from 10 fish landing centers and 40 citizen scientists revealed a 330% increase in small hilsa landings and stable marine fish catch, while the price of larger hilsa doubled. Catch per unit effort (CPUE) data highlighted fluctuations in species such as Bombay duck, hilsa, and thryssa anchovy. ECOFISH II expanded co-management from hilsa to broader marine fisheries by forming 369 Fisheries Conservation Groups, involving 15,010 small-scale fishers, and piloting a fish landing center-based co-management model at 10 landing centers along the Bay of Bengal coast. It also trained 1,508 boat skippers and built national capacity through EAFM training for 48 professionals and 322 committee members, laying the groundwork for sustainable fisheries governance. The project contributed to the development of more than eight key policies, including a revised Hilsa Fisheries Management Action Plan (HFMAP), MPA delineation, the Nijhum Dwip management plan, blue economy guidelines, and low-extractive mariculture strategies, all essential for advancing coastal and marine fisheries management in Bangladesh.
Small-scale fishers are highly impacted by conservation measures, so balancing their needs requires just, equitable, and inclusive strategies. ECOFISH II addressed this by supporting the fishing households through diversified livelihoods, women’s empowerment, and improved access to technology and markets. It helped establish Community Savings Groups (CSGs) and Women Income and Nutrition Groups (WING), empowering 6,575 women and raising BDT 10.6 million in savings. The project also promoted safe dried fish production and climate-resilient horticulture, leading to improved nutrition and dietary diversity. The project also changed nutrition behavior through targeted training and BLS sessions. As a result, 77% of households adopted year-round vegetable cultivation, increasing household income by 78.5% and enhancing dietary diversity for 90% of households. The project also developed nutritious fish and seaweed powders, which generated strong consumer interest. Additionally, it tested various fish-based technologies, such as low-trophic mariculture, dried fish, crab fattening, and seaweed farming, offering new opportunities for technology adoption and market linkages.
This study focuses on the adoption of Improved Aquaculture Management Practices (IAMP) to boost farm productivity and income, examining factors influencing adoption among small-scale aquaculture fish farming households. The research involved 1178 fish farmers practicing three (small-scale commercial aquaculture, Gher based farming and homestead aquaculture) different aquaculture production systems in Bangladesh. Among them, 715 received training on IAMP and support (fingerlings, feed etc.) from WorldFish, while 463 served as control farmers. Adoption levels were measured using the adoption quotient index, and the impact on productivity and income was estimated using propensity score matching (PSM). Results indicated that approximately 65% of project farmers fully adopted IAMP, with around 28% adopting it partially. The adoption quotient of project farmers exceeded that of control farmers. Fish productivity and income were significantly higher for project farmers in all three technologies, and as the level of adoption increased, their productivity significantly surpassed that of control farmers. The findings show that farmers training, participatory trials, guidebooks, and farmers' field days have significant impact on IAMP adoption levels. Thus, in order to ensure sustainable aquaculture production and income for Bangladesh's small-scale farmers, it is recommended that improved aquaculture management practices be prioritized in an attempt to mitigate the challenges caused by environmental and economic factors in the aquaculture sector.
The Clostridium autoethanogenum-derived protein (CAP) is a microbial protein generated during ethanol fermentation of agricultural byproducts. The present investigation evaluated the use of CAP as a sustainable alternative to reduce fishmeal (FM) dependency in aqua-feeds. A 70-day feeding trial was done to examine the impacts of partially replacing FM protein by CAP at 0 % (control, CAP0), 10 % (CAP10), 20 % (CAP20), 30 % (CAP30), and 50 % (CAP50) inclusion levels in diets for European seabass (Dicentrarchus labrax) juvenile (initial weight 10.5 ± 1.5 g). Results obtained demonstrated that dietary CAP incorporation up to 50 % FM replacement did not significantly (P > 0.05) impact the growth performance, feed efficiency, or survival rates. Similarly, the expression levels of growth-related genes (IGF-1 and GH) remained unchanged across treatments. The intestinal digestive enzymes activities, including lipase, alpha-amylase, and proteases, as well as the haematological parameters remained unaffected by the dietary CAP inclusion levels. Histological assessment revealed normal tissue architecture in the intestine, liver, and spleen of fish fed on CAP-containing diets. That indicats no adverse effects of CAP on organs’ structure. A simple economic analysis showed reduced feed costs with increasing CAP inclusion, where production costs per ton of fish gain decreases by 19.3 % at 50 % FM replacement compared to the control diet. These findings establish that CAP is a viable and cost-effective protein source capable of replacing up to 50 % FM protein in practical diets for D. labrax juveniles without compromising their growth, health status, or organs’ structure.
The Integrated Multi-Trophic Aquaculture (IMTA) system is sustainable and environmentally friendly for producing different aquaculture species such as finfish, shellfish, and seaweeds. The development and deployment of the IMTA system are within the scope of the Asia-Africa BlueTech Superhighway project (AABS), Work Package 2 (WP2) implemented by WorldFish in Nigeria, Kenya, and Bangladesh. This scoping study was designed to investigate the current mariculture practices in the target states of Nigeria, with hopes of scaling up using the concept of the IMTA system. The one-month study gathered data from field observations during the visit, key informant interviews of forty-four (44) stakeholders from the Ondo, Ogun, and Lagos states and focus group discussions. The responses were used to produce qualitative and quantitative data on the suitable areas and species combination for IMTA, status of coastal aquaculture in the areas, the species caught from the wild, the involvement of men, women, and youths in the mariculture value chain, and the barriers, prospects and opportunities for mariculture development in the areas. The report also detailed the outcome of the focus group discussions on licenses and permits for IMTA, construction, and deployment of cages for IMTA development in Nigeria.
Outbreaks of emergency animal diseases such as African swine fever (ASF) and foot-and-mouth disease (FMD) are typically managed through regulated control measures, including tracing, surveillance, movement restrictions, culling, disposal and decontamination. However, limited understanding and fragmented data on material flows – such as semen, live animals and meat products – within meat supply chains hinder policymakers' ability to assess the full impact of these measures and to consider these implications in their decision-making. This study aimed to map the material flow within the Australian pork supply chain and to identify the potential socio-economic implications of disease control interventions. Industry experts were engaged to assist in the drafting of a flow chart and to provide descriptions of activities at each segment of the supply chain. Results revealed a highly integrated and complex supply network. These structural and operational features, combined with regulatory movement controls, can lead to significant disruptions, including loss of livestock and breeding capacity, business income and employment, animal welfare risks, psychological stress, reputational damage from mass culling and reduced meat availability for consumers. The findings of this work emphasise the importance of decision-makers being well informed about the effects of supply chain disruptions and the socio-economic consequences of disease control decisions.
The report outlines the achievements of WorldFish and its contributions to the AICCRA Zambia project in 2024. AICCRA stands for Accelerating the Impact of CGIAR Climate Research for Africa. The AICCRA Zambia cluster is led by the International Water Management Institute (IWMI).
The overall goal of AABS is to test innovations, generate evidence and scale technologies, tools and approaches to: Improve food and nutrition security; create increased employment and income opportunities using naturebased solutions; restore and sustainably manage marine and coastal resources to mitigate and help coastal communities adapt to climate change.
Under the framework of the S4I AOW02 - Pathways to Scale in Agrifood Systems (2.3.4) – Egypt, which aims to expand the adoption of integrated aquaculture–agriculture (IAA) systems to enhance sustainability and maximize productivity per unit area, a collaborative mission was conducted to Academy of Scientific Research and Technology (ASRT).
In line with Egypt’s increasing national interest in Integrated Aquaculture Systems (IAA) as a strategic solution to strengthen food security and maximize water and land use efficiency, the Academy of Scientific Research and Technology (ASRT) organized a specialized workshop on “the Importance of developing IAA in Egypt.” The event brought together researchers, professors, government research institutions, and private sector farmers, reflecting the government’s strategic direction toward integrated and climate-smart food production systems. This workshop aimed to foster stronger links between research, policy, and practice to support sustainable aquaculture expansion in Egypt.
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