Potential re-establishment of diadromous fish species in the River Scheldt (Belgium) |
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Authors: | D Buysse J Coeck J Maes |
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Institution: | (1) Research Institute for Nature and Forest, Kliniekstraat 25, Brussels, 1070, Belgium;(2) Laboratory of Aquatic Ecology, Katholieke Universiteit Leuven, Ch. De Bériotstraat 32, Leuven, 3000, Belgium |
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Abstract: | This study (2002) documents on the inland penetration off diadromous fish species into the tidal and non-tidal part of the
River Scheldt and on the impact of two lock-weir complexes. Long-term trends in oxic conditions show the river is undergoing
a natural recovery process, nevertheless five of ten diadromous species recorded were still restricted to the brackish part
of the estuary. Despite poor conditions, five species reached the upper freshwater part of the estuary. Erratic free-flowing
conditions at the tidal weir offered limited opportunities for some diadromous species to migrate into the non-tidal part
of the river. Upstream migration over the second barrier is almost completely blocked. Rehabilitation schemes to restore self-sustaining
populations of diadromous fish in the cross-border River Scheldt need to include the building of fish bypasses and improved
wastewater treatment and habitat restoration programmes.
Guest editors: S. Dufour, E. Prévost, E. Rochard & P. Williot
Fish and diadromy in Europe (ecology, management, conservation) |
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Keywords: | Diadromous fish Upstream migration Pollution Dissolved oxygen Migration barriers Habitat fragmentation |
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