Heinbuch, U., Population and Development in Fishing Communities: The Challenge 1994 Ahead. Cotonou, Programme for the Integrated Development of Artisanal Fisheries in West Africa, 54 p., IDAF/WP/63.
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ProjectFeasibility study on challenges and opportunities for fisheries co-management and diverse livelihoods development for fishing communities in Cambodia
Key summary
2024Also available in:
This document presents key findings from a comprehensive feasibility study aimed at evaluating the current status of fisheries management, co-management practices, and livelihoods in Cambodia.Conducted between July and October 2023, the study employed various methods including desk research, an inception workshop, a scoping mission to community fisheries (CFis), and a validation workshop. These activities were designed to assess the effectiveness of existing co-management strategies and to identify potential CFis sites for the project. -
Book (stand-alone)The decrease in aquatic vegetation in Europe and its consequences for fish populations (1987) 1987
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No results found.A diverse aquatic vegetation is essential to maintain a diverse fish fauna. The fish is an important part of a complex network of relations between nutrients, phytoplankton, epiphytes, herbivorous invertebrates, the aquatic vegetation and fish. In Northwest Europe and North America and probably in the rest of the industrialized world, the (submersed) aquatic vegetation (macrophytes) is rapidly disappearing from eutrophicated waters. The decrease is well documented. As a consequence of abun dant growth of epiphytes, which are better competitors for inorganic carbon and light in highly eutrophicated waters than submersed aquatic macrophytes are, the condition of the aquatic vegetation becomes worse. Shallow, eutrophic, relatively clear water that is rich in water plants, can change to phytoplankton dominated turbid water, within short time. This change may occur without a remarkable increase in the actual nutrient loading. Invertebrate grazers like snails, macrocrustaceans and cl adoceran zooplankters are able to protect aquatic macrophytes against the negative effects of this competition by removing epiphytes and phytoplanktonic algae. As a man predator on invertebrates, the fish indirectly influences the well-being of the aquatic vegetation. There is evidence that aquatic macrophytes are the source of biochemical compounds that negatively affect the growth of algae (allelopathy) and attract grazers. These processes are mainly found in model systems and under semi-na tural conditions. Their ecological significance still has to be tested in the field.A situation with turbid, phytoplankton dominated, water without aquatic vegetation can continue after removing nutrients from effluents because: (i) blue-green algae (phytoplankters) may excrete toxic substances, negatively affecting the growth of aquatic macrophytes; (ii) abundantly occurring young fish, but also invertebrate animals like mysids, prey on the bigger (phytoplankton grazing) cladocerans; (iii) acid rain, polluted bottom sediments and/or bird flocks contribute to the nutrient loading of a water body. Restoration techniques are: lowering the nutrient loading in combination with protection of the remaining stands of reed, replanting of aquatic plants, creation of artificial refugia for zooplankton and manipulation of young-of-the-year fish populations. Chemical and mechanical control of "nuisance" growth and heavy stocking with herbivorous fish including the common carp (Cyprinus carpi o) have to be omitted or executed very carefully to avoid phytoplankton-dominated turbid water. In small systems with "nuisance" growth, stocking (50-150 kg/ha, max. 250 kg/ha) with grass carp (Ctenopharyngodon idella) can improve the water quality. -
Book (series)Climate change implications for fishing communities in the Lake Chad Basin
What have we learned and what can we do better? FAO/Lake Chad Basin Commission Workshop 18–20 November 2011 N’Djamena, Chad
2012Also available in:
No results found.These Proceedings include (1) the Report of and (2) the background paper prepared for the Workshop on Climate change - implications for fishing communities in the Lake Chad Basin: What have we learned and what can we do better? The Workshop was hosted by the Lake Chad Basin Commission (LCBC) from 18 to 20 November 2011, attended by the Lake Chad Basin countries of Cameroon, Central African Republic (CAR), Chad, Niger and Nigeria, and financed through a Japanese-funded, and Food and Agriculture O rganization of the United Nations (FAO)-implemented, project component on Fisheries management and marine conservation within a changing ecosystem context (GCP/INT/253/JPN), in collaboration with LCBC. Presentation topics included: the hydrology of the Lake Chad region, national contexts of climate change and fisheries, identification and reduction of climate change vulnerability in the fisheries of the Lake Chad Basin and an overview of current projects on Lake Chad. Discussions largely focused on: hydrology and climate trends of the Lake Chad basin, national perspectives on impacts and adaptations of climate change, current natural resources projects in the Lake Chad Basin and recommendations for actions to increase adaptability and resilience to be carried out. The workshop recommended that there is more coordinated action and information sharing regarding natural resources, and increased cooperation between LCBC member State governments to support and strengthen existing political commitments in the Lake Chad Basin for effective aquatic resource use management to ensure sustainable development of land and aquatic based activities in the basin.
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