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2013_Foyle: Freshwater and coastal migration patterns in the silver-stage eel Anguilla anguilla
Citation
Barry, J., Newton, M., Dodd, J. A., Lucas, M. C., Boylan, P., & Adams, C. E. (2016). Freshwater and coastal migration patterns in the silver‐stage eel Anguilla anguilla.
Contact: Barry, James

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
The unimpeded downstream movement patterns and migration success of small female and male Anguilla anguilla through a catchment in north-west Europe were studied using an acoustic hydrophone array along the River Finn and into the Foyle Estuary in Ireland. more

The unimpeded downstream movement patterns and migration success of small female and male Anguilla anguilla through a catchment in north-west Europe were studied using an acoustic hydrophone array along the River Finn and into the Foyle Estuary in Ireland. Twenty silver-stage A. anguilla were trapped 152 km upstream from a coastal marine sea-lough outlet and internally tagged with acoustic transmitters of which 19 initiated downstream migration. Migration speed was highly influenced by river flow within the freshwater compartment. Anguilla anguilla activity patterns were correlated with environmental influences; light, tidal direction and lunar phase all influenced the initiation of migration of tagged individuals. Migration speed varied significantly between upstream and lower river compartments. Individuals migrated at a slower speed in transitional water and sea-lough compartments compared with the freshwater compartment. While 88.5% survival was recorded during migration through the upper 121 km of the river and estuary, only 26% of A. anguilla which initiated downstream migration were detected at the outermost end of the acoustic array. Telemetry equipment functioned efficiently, including in the sea-lough, so this suggests high levels of mortality during sea-lough migration, or less likely, long-term sea-lough residence by silver A. anguilla emigrants. This has important implications for eel management plans.

Scope
Themes:
Biology > Fish, Fisheries
Keywords:
Marine, Brackish water, Acoustic telemetry, Tracking, Anguilla anguilla (Linnaeus, 1758)

Temporal coverage
1 July 2013 - 1 March 2014
Quasi continuous (< 1 min.)

Taxonomic coverage
Anguilla anguilla (Linnaeus, 1758) [WoRMS]

Contributors
Fisheries Ireland, 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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