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EMMN: Early marine migration of European silver eel in northern Norway
Citation
Davidsen J G; Finstad B; Okland F; Thorstad E B; Mo T A; Rikardsen A H (2007) Early marine migration of European silver eel in northern Norway

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

Description
To study the migratory behaviour in wild northern European silver eel Anguilla anguilla during sea entry and early marine migration, 32 individuals were tagged with acoustic transmitters and registered at four automatic listening station arrays from the mouth of the north Norwegian River Alta and throughout the Alta Fjord. more

To study the migratory behaviour in wild northern European silver eel Anguilla anguilla during sea entry and early marine migration, 32 individuals were tagged with acoustic transmitters and registered at four automatic listening station arrays from the mouth of the north Norwegian River Alta and throughout the Alta Fjord. The European eel entered the fjord during all parts of the tidal cycle and did not seem to utilize the outgoing tidal currents. They migrated mainly during the night, in both the river mouth and the fjord. On average, they spent 2.7 days travelling from the river mouth to the outermost array, 31 km from the river mouth, corresponding to an average migratory speed of 0.5 km/h. The European eel generally migrated in the central part of the fjord and in the uppermost 10–25% of the water column, but with frequent dives to greater depths. Already 4 km after sea entry, European eel were observed diving deeper than 130 m within 20–30 min periods. Hence, this study demonstrated that European eel may perform an active diving behaviour during the early marine migration. The study took place in a pristine area with a minimum of anthropogenic interventions and by individuals from a population still uninfected by the introduced parasite Anguillicoloides crassus. The results may therefore be used as a baseline for future studies of the European eel early marine migration.

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

Geographical coverage
ANE, Norway, Altafjord [Marine Regions]

Temporal coverage
11 April 2007 - 1 April 2008
Quasi continuous (< 1 min.)

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

Contributors
University of Tromso; Tromso museum, moredata creator

Related datasets
Parent dataset:
ETN data: fish acoustic receiver network, more

Dataset status: Completed
Metadatarecord created: 2019-06-03
Information last updated: 2019-06-03
All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy