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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

Availability: Unrestricted after moratorium period
Data are initially restricted, but the access condition relaxes to academic or unrestricted once a specified period of time after an event (such as collection, publication, completion of QC procedures or project cessation) has elapsed

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, Brackish water, 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:
ETN data: fish acoustic receiver network, more

Dataset status: Completed
Data type: Data
Data origin: Research: field survey
Metadatarecord created: 2019-10-07
Information last updated: 2020-02-20
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