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Article

Movements of Non-Migrant European Eels in an Urbanised Channel Linking a Mediterranean Lagoon to the Sea

1
Centre de Formation et de Recherche sur les Environnements Méditerranéens, Université de Perpignan Via Domitia, UMR 5110, F 66860 Perpignan, France
2
CNRS, Centre de Formation et de Recherche sur les Environnements Méditerranéens, UMR 5110, F 66860 Perpignan, France
*
Author to whom correspondence should be addressed.
Academic Editor: Eleonora Ciccotti
Water 2021, 13(6), 839; https://doi.org/10.3390/w13060839
Received: 19 February 2021 / Revised: 12 March 2021 / Accepted: 17 March 2021 / Published: 19 March 2021
Transitional ecosystems and, particularly, Mediterranean lagoons represent important habitats for the European eel (Anguilla anguilla) population. In these habitats many anthropogenic pressures can disturb eel movements and, in turn, negatively affect the population. Despite the importance of movements during the non-migrant growing stage in eels, this topic is understudied in Mediterranean lagoons. We thus aim to describe the diel and seasonal phenology and the effect of environmental drivers on non-migrant eel movements. Videos obtained from an Adaptive Resolution Imaging Sonar (ARIS) acoustic camera that continuously recorded from October 2018 to April 2020 were processed to evaluate the daily number of eels swimming toward the lagoon. More than 60% of the 7207 eels observed were females with a size >45 cm. Movements were year-round and predominantly during the night. A Boosted Regression Tree analysis demonstrated that, among the 10 environmental drivers studied, flow velocity, water temperature, discharge of the main tributary, wind velocity and atmospheric pressure, had the strongest influence on eel movement activity. Non-migrant eel movements should be better incorporated into lagoon management plans through actions such as limiting dredging activities from 18:00 to midnight, especially when the water flows toward the lagoon and when the water temperature is higher than 12 °C. View Full-Text
Keywords: acoustic camera; Anguilla anguilla; behaviour; diadromy; dual-frequency sonar; migratory fish acoustic camera; Anguilla anguilla; behaviour; diadromy; dual-frequency sonar; migratory fish
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MDPI and ACS Style

Lagarde, R.; Peyre, J.; Amilhat, E.; Bourrin, F.; Prellwitz, F.; Simon, G.; Faliex, E. Movements of Non-Migrant European Eels in an Urbanised Channel Linking a Mediterranean Lagoon to the Sea. Water 2021, 13, 839. https://doi.org/10.3390/w13060839

AMA Style

Lagarde R, Peyre J, Amilhat E, Bourrin F, Prellwitz F, Simon G, Faliex E. Movements of Non-Migrant European Eels in an Urbanised Channel Linking a Mediterranean Lagoon to the Sea. Water. 2021; 13(6):839. https://doi.org/10.3390/w13060839

Chicago/Turabian Style

Lagarde, Raphaël; Peyre, Jason; Amilhat, Elsa; Bourrin, François; Prellwitz, François; Simon, Gaël; Faliex, Elisabeth. 2021. "Movements of Non-Migrant European Eels in an Urbanised Channel Linking a Mediterranean Lagoon to the Sea" Water 13, no. 6: 839. https://doi.org/10.3390/w13060839

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