River fisheries: ecological basis for management and conservation. In: Proceedings of the Second International Symposium on the Management of Large Rivers for

Large rivers and their floodplains sup-port a significant proportion of the world’s biodiversity and provide important goods and ecological services to society, including fish-eries. Riverine ecosystems and fisheries are subject to intense pressure from a wide range of anthropogenic disturbances, the main ones being impacts from altered land use, modifi-cations to river flow regimes, riparian and physical habitat loss, water pollution, exotic species invasions and intensive exploitation of fish stocks. As a consequence, a far greater proportion of freshwater species are threat