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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on June 12, 2007
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsm079
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© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Silver eel migration behaviour in the Baltic

Håkan Westerberg1,, Ingvar Lagenfelt1 and Henrik Svedäng2

1 Swedish Board of Fisheries, PO Box 423, S-40126 Göteborg, Sweden
2 Swedish Board of Fisheries, Institute of Marine Research, PO Box 4, S-453 91 Lysekil, Sweden

Correspondence to H. Westerberg: tel: +46 31 7430333; fax: +46 31 7430444; e-mail: hakan.westerberg{at}fiskeriverket.se

Westerberg, H., Lagenfelt, I., and Svedäng, H. 2007. Silver eel migration behaviour in the Baltic. – ICES Journal of Marine Science, 64.

Female silver eels (Anguilla anguilla L.) were tagged with data storage tags and released in the Baltic Sea at the same time at a single site on the east coast of Sweden. Data on temperature, light, and depth were obtained from six eels, continuous records for 71 d at sea. The swimming behaviour was similar for all fish, almost stereotyped: swimming activity was between dusk and dawn, starting at a light level corresponding to civic twilight and ending in the morning at generally the same light level. During daylight, the eels rested on the seabed at depths of 2–36 m. Swimming depth was typically close to the surface: up to 95% of swimming time was spent within 0.5 m of the surface. Short dives at irregular intervals (some 1–2 h–1) were made down to the thermocline depth, or occasionally, to the seabed. The duration of such dives were typically 5–10 min. Although only a few days at liberty, the eels had migrated a considerable distance between recapture and release sites, indicating a mean rate of travel of ~16 km d–1. The recapture positions suggested unidirectional movements towards the southwestern Baltic Sea, i.e. close to the straits leading to the ocean, supporting a belief that the recorded movements were related to eel spawning migratory behaviour.

Keywords: diurnal behaviour, eel, migration, swimming depth

Received 3 January 2007; accepted 10 May 2007.


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