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Do otolith annular structures correspond to the first freshwater entry for yellow European eels Anguilla anguilla in the Baltic countries?

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To examine the relationship between freshwater entry and otolith annular structures, a total of 113 naturally recruited European eels Anguilla anguilla from Lithuania and Latvia that entered fresh water at least once were collected. In some individuals (8·3–11·3%), the first freshwater entry coincided with a dark check that was distinctly different from neighbouring annuli. In most individuals (81·7–84·9%), the first freshwater entry occurred on rings and increments indistinguishable from other annuli. For the remaining individuals (3·8–10%), the first freshwater entry did not correspond to any otolith ring, band or annulus. According to recent evidence, the observed high correspondence between the first freshwater entry and otolith annuli was more likely due to the movement into fresh water during winter when the annulus was deposited, rather than stress resulting from habitat change. Consequently, the age estimation based on otoliths might be less influenced by this habitat change during the yellow eel stage.

Keywords: Anguilla anguilla; Sr:Ca ratios; annulus; habitat change; otolith

Document Type: Regular Paper


Affiliations: 1: Institute of Fisheries Science, National Taiwan University, Taipei, 10617, Taiwan, R.O.C. 2: Institute of Oceanography, National Taiwan University, Taipei, 10617, Taiwan, R.O.C. 3: Institute of Ecology of Vilnius University, Vilnius, LT-08412, Lithuania 4: Latvian Fish Resources Agency, State Agency, Ministry of Agriculture, Riga, LV-1048, Republic of Latvia 5: Institute of Earth Sciences, Academia Sinica, Nankang, Taipei, 10617, Taiwan 6: Institute of Biology, University of Latvia, Salaspils, LV-2169, Republic of Latvia

Publication date: December 1, 2009


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