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Prignon, C.; Micha, Jean‐Claude; Rimbaud, Gilles; Philippart, Jean-Claude

doi:10.1023/a:1003739327687

Cited by 10 publications

(1 citation statement)

References 13 publications

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“…The construction of F2 in 1998 at Lixhe dam was a part of the 'Meuse salmon programme' that aims to restore the complete life cycle of migratory salmonids in the River Meuse basin, improving free movement (upstream and downstream) via the installation of modern fishways adapted to diadromous salmonids [57]. The continuous monitoring revealed the first beneficial outcome of the restoration project: a significant upward trend in the number of adult salmon and sea trout in reproductive migration caught in the lower Belgian Meuse.…”

Section: Discussionmentioning

confidence: 99%

Assessment of Fish Abundance, Biodiversity and Movement Periodicity Changes in a Large River over a 20-Year Period

et al. 2022

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A river is an ecosystem where fish fauna represents an important structural element. To re-establish connectivity, it is imperative to allow movement between functional habitats. Due to the hydromorphological complexity of large anthropized rivers and the lack of study techniques that can be used in such environments, relevant data with regard to fish ecology are scarce. On the River Meuse, Belgium, at a point 323 km upstream from the North Sea, the Lixhe hydroelectric dam is equipped with two fishways. Both were continuously monitored using capture traps for 20 consecutive years (from 1999 to 2018), representing 4151 monitoring events. The objectives of the present study were to describe the overall abundance and movement indicators of mainly holobiotic potamodromous fish species and to analyse their temporal evolution. We captured 388,631 individuals (n = 35 fish species) during the 20 years of fishway monitoring; 22.7% were adults (>75% of which were cyprinids), and 83.3% juveniles (>90% cyprinids). From 1999 to 2018, the results showed a drastic reduction in yearly captures for some native species as well as the apparent emergence of non-native (e.g., Silurus glanis) and reintroduced species (e.g., Salmo salar). The annual capture periodicities associated with environmental factors were clearly defined and were mostly related to the spring spawning migration of the adult stage. This long-term monitoring demonstrated how the fishways are used by the whole fish community and allowed a better understanding of their movement ecology in a large lowland anthropized river. The appearance of non-native species and the drastic decline in abundance of some common and widespread European fish should prompt river managers to adopt conservation measures.

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Section: Discussionmentioning

confidence: 99%

Assessment of Fish Abundance, Biodiversity and Movement Periodicity Changes in a Large River over a 20-Year Period

et al. 2022

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THE RETURN OF ATLANTIC SALMON (SALMO SALAR L.) AND IMPROVED WATER QUALITY IN URBAN RIVERS IN OSLO, NORWAY

Saltveit

Brittain

Bremnes

et al. 2013

River Research & Apps

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Most rivers and streams in the city of Oslo, Norway, rise in the surrounding forests, and all run through industrial and urban areas before they reach the sea. Most of these rivers have a long history of poor water quality in the middle and lower reaches until the early 1980s. This was reflected in low benthic diversity and the absence of fish. However, at the end of the 1970s, considerable efforts were made to limit industrial discharges, pollution episodes, and urban runoff, resulting in a substantial improvement in water quality. This improvement in water quality resulted in major changes in the benthos and fish populations of the rivers, especially the river Akerselva, which runs through the city centre. Here Atlantic salmon (Salmo salar) became extinct in the mid-1800s and did not return until 1983. Atlantic salmon and sea trout (Salmo trutta) now spawn in the lower reaches, and the river supports juvenile populations of these salmonids. In line with the improvement in water quality, benthic biodiversity has also increased. These improvements have been documented based on long-term monitoring of benthos and fish. Increased benthic diversity and presence of fish also enabled the authorities to trace the source of several pollution episodes that led to fish kills. The European Union Water Framework Directive will bring further pressure to maintain a stable and good ecological status for the Oslo rivers, although it may be difficult to attain this goal in an urban environment.

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The impact of small physical obstacles on upstream movements of six species of fish

2002

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Untitled

Cited by 10 publications

References 13 publications

Assessment of Fish Abundance, Biodiversity and Movement Periodicity Changes in a Large River over a 20-Year Period

Assessment of Fish Abundance, Biodiversity and Movement Periodicity Changes in a Large River over a 20-Year Period

THE RETURN OF ATLANTIC SALMON (SALMO SALAR L.) AND IMPROVED WATER QUALITY IN URBAN RIVERS IN OSLO, NORWAY

The impact of small physical obstacles on upstream movements of six species of fish

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