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Effects of the swimbladder parasite Anguillicola crassus on the migration of European silver eels Anguilla anguilla in the Baltic Sea
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Animal Ecology.
2009 (English)In: Journal of Fish Biology, ISSN 0022-1112, E-ISSN 1095-8649, Vol. 74, no 9, 2158-2170 p.Article in journal (Refereed) Published
Abstract [en]

In a mark-recapture study in 2006, migrating European Anguilla anguilla silver eels were caught, tagged and released in the Baltic Sea and recaptures in commercial pound nets examined for possible effects on migration of infection with the swimbladder parasite Anguillicola crassus. The overall recapture rate was 36%. The prevalence of infection was lowest at the northernmost sampling site. There were no significant differences between infected and uninfected A. anguilla in condition indices, body fat content and estimated migration speeds. Parasite infection intensity levels were significantly negatively correlated with times and distances covered between release and recapture, but did not correlate with migration speed. It appears that more heavily infected A. anguilla were relatively more vulnerable to recapture in pound nets. It is hypothesized that parasite-induced damage to the swimbladder inhibited vertical migrations and infected A. anguilla tended to migrate in shallower coastal waters, relatively close to the shore.

Place, publisher, year, edition, pages
2009. Vol. 74, no 9, 2158-2170 p.
Keyword [en]
parasite incidence, parasite infestation, parasite prevalence, swimming speed, tagging experiment, vertical migration
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-128357DOI: 10.1111/j.1095-8649.2009.02296.xISI: 000268271100021OAI: oai:DiVA.org:uu-128357DiVA: diva2:331385
Available from: 2010-07-22 Created: 2010-07-20 Last updated: 2010-07-22Bibliographically approved

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