Development of Fish Passage Technology to Increase Fisheries Production on Floodplains in the Lower Mekong Basin

Development of Fish Passage Technology to Increase Fisheries Production on Floodplains in the Lower Mekong Basin
Author: Lee Baumgartner
Publisher:
Total Pages: 75
Release: 2019
Genre: Fishes
ISBN: 9781925747195

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"The project sought to primarily develop the first criteria for fish passage developed for Lower Mekong species but also understand the extent of current irrigation development and quantify potential social and economic benefits. A series of field-based assessments was devised to specifically answer three research questions: 1. What is the current extent of floodplain development in Central and Southern Laos? 2. Can effective low-cost fishways be constructed to mitigate the negative social, economic and environmental impacts of floodplain regulators? 3. Does the construction of permanently-operating fishways provide quantifiable social, economic and environmental benefits to floodplain wetlands and communities?"--Page 4.

An ecosystem approach to promote the integration and coexistence of fisheries within irrigation systems

An ecosystem approach to promote the integration and coexistence of fisheries within irrigation systems
Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
Total Pages: 65
Release: 2018-12-03
Genre: Technology & Engineering
ISBN: 9251311463

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This technical document has been developed in recognition of the increasingly diverse demands for water from irrigation systems and the need to introduce more holistic land uses into conventional irrigation management. Despite historical precedents and efforts in the twentieth and early twenty-first centuries, the potential for the integration of fish production (capture fisheries and aquaculture) and irrigation systems has yet to be fully realized. Capturing these underutilized opportunities for the integration of fisheries and aquaculture could significantly increase local economies, food security, household incomes and livelihood diversity within irrigated agriculture systems. To re-examine the potential of fisheries in irrigation systems, the concept of the extended command area (ECA) is used, expanding the conventional definition of an agriculture irrigation command area. The reason for this expanded definition is because all elements of an irrigation system, from upstream dam storage to downstream drainage areas, offer opportunities for increasing fish production. Many of these opportunities may be realized at no additional cost to the main irrigated crop. This document provides an introduction to the ways fisheries and aquaculture already co-exist with irrigation and explores the threats and opportunities that arise from this. A key concept for sustaining and enhancing inland capture fisheries is “connectivity”– a fundamental basis for ensuring adequate environmental conditions to allow fish to flourish within an aquatic ecosystem such as a river, lake, or wetland. Improving connectivity within an ECA can restore elements of ecological services that may have been compromised or degraded through irrigation, water management or through other rural infrastructure development such as road construction. Practical application of the integration of fisheries and irrigation systems is explored through the use of the Ecosystem Approach to Fisheries (EAF) in the context of irrigation systems. The proposed process links the development of an EAF management plan for fisheries to irrigation system operation and is given the acronym EAFm-i. A key part of this linkage is an assessment of water resources in the system and the management of water for delivery to fisheries. Additional tools to support the EAFm-i process are also described. Although the experience and approach are drawn largely from irrigation systems and inland capture fisheries in Southeast Asia, the application of the ECA concept and approach will be relevant to any irrigation or water management system where there is potential for the closer integration and harmonization of fisheries and irrigation systems and where water users are interested in realizing this potential. This short paper is intended to encourage fisheries and irrigation specialists to engage in greater dialogue and cooperation over the integration of fisheries into irrigation planning and to support piloting of an EAFm-i process, which can be the basis for further development.

Restoration of productive aquatic ecosystems by small-scale fisheries and aquaculture communities in Asia

Restoration of productive aquatic ecosystems by small-scale fisheries and aquaculture communities in Asia
Author: Gardiner, N.M.
Publisher: Food & Agriculture Org.
Total Pages: 76
Release: 2022-04-06
Genre: Technology & Engineering
ISBN: 9251357714

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This report showcases examples of actions taken by small-scale fishers and aquaculture farmers in Asia to restore the productivity of aquatic ecosystems. Small-scale fishers and fish farmers include some of the world’s most marginalized and impoverished people groups, yet their harvests account for over half of the world’s aquatic food production. The marine, coastal and freshwater ecosystems their livelihoods depend upon are degraded from human impacts and further at risk from climate change. Ecosystem restoration actions by fisherfolk communities can revitalize the socio-ecological services and sustain progress over time. Both passive and active restoration approaches are being employed across Asia’s marine, coastal and inland waterways. Fishers, fish farmers, and fishworkers’ restorative actions are focused on increasing the sustainability of their operations. Common approaches include eliminating destructive fishing, reducing overfishing through gear changes and effort control, restoring connectivity of floodplains and fish migration pathways, integrated aquaculture and rice-farming practices, re-stocking of native fisheries, and actively rehabilitating and / or re-establishing habitats. Progress is measurable through a diverse array of environmental, socio-economic and governance related metrics. Changes in fisheries catches, ecological connectivity, water quality, habitat diversity and structure, and fish consumption provide important measures of biodiversity gains (or losses). Common enablers of success include economic incentives, co-management and legal recognition of fishing rights, highly engaged fisherfolk cooperatives or community groups, women’s leadership and development, and community partnerships with stakeholders that focus on enabling fisherfolk’s own goals for sustainable livelihoods. Ecosystem restoration activities have not lasted when these enablers are insufficiently attended to and when environmental aspects of project feasibility, such as the choice of rehabilitation locations and / or species, are poorly planned. Successes in ecosystem restoration by fisherfolk can and are being scaled out to neighbouring communities and countries. Key to this is the sharing of stories, lessons learned and tools through south-south partnerships, learning exchanges, and women’s groups. Simple, low-cost tools and actions have enabled long-term engagement by small-scale fishers in sustainable operations. More complex actions, such as the uptake of integrated aquaculture systems, are also enabling stepwise changes in ecosystem restoration. By sharing stories from different ecosystems, fisheries, and geographies, this report seeks to help fisherfolk and their partners glean from one another and achieve faster progress in ecosystem restoration.

Agroecology in Policy and Practice

Agroecology in Policy and Practice
Author: Rachel Bezner Kerr
Publisher: Frontiers Media SA
Total Pages: 196
Release: 2023-10-13
Genre: Technology & Engineering
ISBN: 2832516637

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In the past years, there has been steady growth in work relating to agroecology. People-centred, knowledge-intensive and rooted to sustainability, it is now well established that agroecology matches the transformative approach called for by the 2030 Agenda; a transition to sustainable food and agriculture systems that ensures food security and nutrition for all, provides social and economic equity, and conserves biodiversity and the ecosystem services on which agriculture depends. Although not a new concept, agroecology is today gaining interest worldwide among a wide range of actors as an effective answer to climate change and the interrelated challenges facing food systems, finding expression in the practices of food producers, in grassroots social processes for sustainability and the public policies of many countries around the world.

Innovations in Fish Passage Technology

Innovations in Fish Passage Technology
Author: Mufeed Odeh
Publisher:
Total Pages: 240
Release: 1999
Genre: Nature
ISBN:

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Odeh (Conte Anadromous Fish Research Center) presents 13 contributions which explore the technical possibilities of constructing effective fish bypass systems for hydroelectric dams, especially those that are due for relicensing in the context of new regulations. The articles consist of case studies in the effectiveness of such techniques as surface bypass systems, modular inclined screens, hydroacoustic evaluation of fish entrainment patterns, surface collection, surface spill gates, and radio-tagging and radar tracking behavior evaluation strategies. Annotation c. Book News, Inc., Portland, OR (booknews.com).

Floodplain River Food Webs in the Lower Mekong Basin

Floodplain River Food Webs in the Lower Mekong Basin
Author: Chouly Ou
Publisher:
Total Pages:
Release: 2014
Genre:
ISBN:

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The Mekong River is one of the world's most important rivers in terms of its size, economic importance, cultural significance, productivity, and biodiversity. The Mekong River's fisheries and biodiversity are threatened by major hydropower development and over-exploitation. Knowledge of river food web ecology is essential for management of the impacts created by anthropogenic activities on plant and animal populations and ecosystems. In the present study, I surveyed four tropical rivers in Cambodia within the Mekong River Basin. I examined the basal production sources supporting fish biomass in the four rivers during the dry and wet seasons and explored the relationship between trophic position and body size of fish at various taxonomic levels, among local species assemblages, and across trophic guilds. I used stable isotopes of carbon and nitrogen to estimate fish trophic levels and the principal primary production sources supporting fishes. My study provides evidence that food web dynamics in tropical rivers undergo significant seasonal shifts and emphasizes that river food webs are altered by dams and flow regulation. Seston and benthic algae were the most important production sources supporting fish biomass during the dry season, and riparian macrophytes appeared to be the most important production source supporting fishes during the wet season. In the river with strong flow regulation from an upstream impoundment, seston and benthic algae were even more important production sources supporting fishes during the dry season. My findings challenge the Eltonian theory of size-based trophic structure in food webs and also contradict the broadly accepted prediction of the fishing-down-the-food-web concept. Eltonian and fishing-down-the-food-web concepts propose that trophic level is strongly correlated with body size, but I found no significant correlation between body size and trophic position for fish assemblages. Results suggest that body size distributions are not useful for prediction the trophic structure of communities with diverse detritivores, omnivores and insectivores, but that it is a good predictor of trophic position among piscivorous fishes. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/151776