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2011_Loire: Migration behaviour of silver eels (Anguilla anguilla) in a large estuary of Western Europe inferred from acoustic telemetry
Citation
Bultel, E; Lasne, E; Acou, A; Guillaudeau, J; Bertier, C; Feunteun, E. (2014) Migration behaviour of silver eels (Anguilla anguilla) in a large estuary of Western Europe inferred from acoustic telemetry. https://marineinfo.org/id/dataset/6336

Availability: Creative Commons License This dataset is licensed under a Creative Commons Attribution 4.0 International License.

Description
This study investigated the estuarine migration of female silver eels in the Loire River using an acoustic telemetry system. more

Despite intensive research on eels, the behaviour of silver eels in estuaries during their migration remains poorly documented which creates serious gaps in planning the restoration of the European eel population. Estuaries are complex environments that can be exposed to large human pressures which could impede, delay migration or impact fish reproductive potential. This study investigated the estuarine migration of female silver eels in the Loire River using an acoustic telemetry system. An array of 31 hydrophones was deployed in the Loire estuary and 51 female seaward migrants were tagged with acoustic transmitters and released 20 km upstream of the estuary, at 100 km from the river mouth. 94% of the silver eels could be followed down to the river mouth. Mean global estuarine speed was 4.5 km days 1, i.e., 0.05 m s 1 and residence times varied significantly between upstream and lower compartments. Mean directional migration speed was found to be 48.6 km days 1, i.e., 0.56 m s 1, and appeared correlated with total length and body weight. Also, daily escapement rate was highly influenced by river flow.

Scope
Themes:
Biology > Fish, Fisheries
Keywords:
Marine/Coastal, Brackish water, Acoustic telemetry, Acoustic Telemetry, Tracking, Pisces

Temporal coverage
11 November 2011 - 25 February 2012
Quasi continuous (< 1 min.)

Taxonomic coverage
Pisces [WoRMS]

Contributors
National Natural History Museum Paris (MNHN), moredata creator

Related datasets
Parent dataset:
European Tracking Network (ETN) data, more

Dataset status: Completed
Data type: Data
Data origin: Research: field survey
Metadatarecord created: 2019-10-07
Information last updated: 2023-05-22
All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy