Abstract
The dynamics of upstream movements of the yellow eel Anguilla anguilla were investigated at Lixhe on the Belgian River Meuse in an inland fish pass regularly monitored from 1992 to 2014. Based on a constant year-to-year sampling effort, we examined the abundance of ascending yellow eels and their body size, seasonal movement, and the associated water temperature and flow. Over the last 23 years, the number of ascending yellow eels has declined at an average 4.2 % per year since 1992. The abundance of eels in 2014 is estimated at 4.5 % of the ascending stock in 1992. We observed that some annual variations in eel abundance at Lixhe might be related to opening fish passes downstream of the study site. The results clearly demonstrated that long-term declining abundance of eels has resulted in increased sizes (mean increase, 4.1 mm per year since 1992) and temperatures triggering the upstream movement process (1.03 °C per decade), with earlier dates for the last eel passages reducing the difference between temperature extremes of eel passages through the fish pass during the migration season. Eel movements occurred in spring and summer at low river discharge and were mainly triggered by high-temperature events. Eels have become larger with time because of improved feeding opportunities and more growth habitats available resulting from the long-term reduction in recruitment. This study highlights the importance of investigating long time spans for a better comprehension of the changes observed in yellow eels and for the optimization of management measures and future research.
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Acknowledgments
The authors express their thanks to J.C. Philippart who provided historical catch data and SETHY-MET of Wallonia Public Service (SPW) for the environmental data. We also thank G. Rimbaud, A. Dierckx, and J.P. Benitez for their participation in the fieldwork and anonymous referees for their valuable comments on this manuscript. This study was funded by the “Stock abundance estimation of wild yellow eels recruited by upstream migration in the Meuse River of Wallonia and implementation of restocking tests using glass eels and elvers” project funded by the European Fisheries Fund (FEP No. 32-1102-002) and represented by X. Rollin and F. Fontaine.
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Matondo, B.N., Ovidio, M. Dynamics of upstream movements of the European eel Anguilla anguilla in an inland area of the River Meuse over the last 20 years. Environ Biol Fish 99, 223–235 (2016). https://doi.org/10.1007/s10641-016-0469-x
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DOI: https://doi.org/10.1007/s10641-016-0469-x