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Book (series)Habitat rehabilitation for inland fisheries. Global review of effectiveness and guidance for rehabilitation of freshwater ecosystems. 2005
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No results found.The degradation of aquatic habitats through decades of human activities has lead to large efforts to restore and rehabilitate freshwater habitats for fisheries and aquatic resources in watersheds throughout the world. This document reviews published evaluations of freshwater habitat rehabilitation projects including studies on roads and sediment reduction, riparian and floodplain rehabilitation, placement of habitat structures in lakes and streams, addition of nutrients to increase aquatic produ ction, as well as other less common techniques. It was difficult to draw firm conclusions about many specific techniques due to the limited information provided physical habitat, biota and costs as well as the short duration and scope of most published evaluations. However, techniques such as reconnection of isolated habitats, rehabilitation of floodplains, and placement of instream structures have clearly proven effective for improving habitat and increasing local fish abundance under many cir cumstances. Techniques that restore processes such as riparian rehabilitation, sediment reduction methods (road improvements), dam removal and restoration of floods also show promise but may take years or decades to detect a change in biota. Other techniques such as bank protection, beaver removal, and bank debrushing can produce positive effects for some species but more often produce negative impacts on biota or disrupt natural processes. Our review demonstrates that three key areas lacking i n rehabilitation activities: 1) adequate assessment of historic conditions, impaired ecosystem processes, and factors limiting biotic production; 2) understanding upstream or watershed-scale factors that may influence effectiveness of reach or localized rehabilitation techniques; and 3) well designed and funded monitoring and evaluation. -
Book (series)A review of the inland fisheries of the People’s Republic of China and the strengthening of capacity in the collection and analysis of inland fisheries statistics 2023
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No results found.China’s surface waters cover 20.6 million ha. The aquatic living resources in these waters not only sustain wild natural fishery production, but also support fish production based on stock enhancement and aquaculture. Most inland capture fisheries are concentrated in the major rivers and lakes, whereas reservoirs are dominated by enhanced fisheries. In 2020, the national freshwater fishing output was 1.46 million tonnes, which was a decrease of 20.84 percent from the previous year. Since 2005, the output value of freshwater capture fishing and aquatic products in China has exceeded CNY 20 billion, reaching a peak of CNY 46.577 billion in 2018. With increasing economic development, the role of inland capture fisheries in the social economy has changed. Since the 1990s, there has been a gradual increase in aquaculture and since 2010 a gradual decrease in inland capture fishery production. With the issuance of various fishing ban policies and the strengthening of enforcement actions, especially the implementation of the “10-year fishing ban” on the Yangtze River and the fishing ban on major lakes, inland capture fisheries production has dropped sharply since 2016 and this development is expected to continue due to the increased awareness of the need for ecological protection in large waterbodies, the implementation of the fishing ban policy and the strengthening of law enforcement. However, even though aquaculture production has massively increased and provides the bulk of freshwater fish supply, high-quality aquatic products from natural waters are still highly sought after by consumers. -
Book (series)Review of the State of the World Fishery Resources: Inland Fisheries 2011
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No results found.The fishery statistics reported to FAO by countries and maintained in the FishStat database are analysed for trends in quantity and composition of catches from 1950 to 2009. Catches have been increasing at a steady rate throughout the period. Fish from inland water capture fisheries are an important source of animal protein, especially in landlocked countries and for populations riparian to lakes and rivers. Finfish contribute about 90 percent of the catch together with some crustaceans and molluscs. The accuracy of reporting of catches by taxonomic group has improved with time and more groups are being reported in 2009 than in 1950. At the same time, the percentage of catches assigned to the generic “freshwater fishes NEI” category has declined. Trends in catches and taxonomic groups are analysed for subcontinental regions under a more general continental heading. The regions are divided mainly by geography, although in some cases economic and political consideration s are used. Catches in the various regions of Africa, Asia and South and Central America have risen steadily over the period of the review, although there are local exceptions to the general trend. There is clear evidence that such increases are real in some individual fisheries, but generally the increases are attributed to improvements in reporting, whereby catches that were already there but previously ignored are now being incorporated into the reports. Catches in North America, an d most of Europe, have declined in the same period, which is attributed to shifts in economic conditions that make fishing not longer financially viable, and a greater public demand for recreational fishing. Catches from eastern Europe and the Russian Federation declined from a maximum in the 1980s, but have shown some signs of recovery in the last decade. In general, the world’s inland fisheries still appear viable although environmental pressures, such as damming, water abstraction a nd overexploitation, pose a potential threat to the maintenance of present levels of reproduction and recruitment, and hence, ultimately catch.
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