Growth differences between naturally recruited and stocked European eel Anguilla anguilla from different habitats in Lithuania

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Abstract:

European eels Anguilla anguilla from freshwater lakes in Lithuania had slower growth rates and lower backcalculated total lengths (LT) than those from lagoons and coastal waters, but no significant differences were found among fish with different migratory histories or between naturally recruited and stocked fish except a higher LT at age of stocked European eels at ages 5 to 8 years. The asymptotic LT ( L- T ∞ ) did not differ among habitats or migratory histories, but the stocked eels in the lakes had smaller K (coefficient from the von Bertalanffy growth function) than did the both naturally recruited and stocked eels in the lagoon and coastal waters. The growth rate of European eels in Lithuania might be influenced mainly by different habitats rather than different migratory histories and stocking. The lower LT at age of naturally recruited fish at ages 5–8 years compared to stocked fish might result from the extra energy costs entailed in migration from the Atlantic and across the Baltic Sea.

Keywords: Anguilla anguilla; Sr:Ca ratios; growth; habitats; migratory histories; stocking

Document Type: Regular Paper

DOI: http://dx.doi.org/10.1111/j.1095-8649.2007.01642.x

Affiliations: 1: Institute of Fisheries Sciences, College of Life Science, National Taiwan University, Taipei, 10617, Taiwan, ROC 2: Institute of Ecology of Vilnius University, Akademijos st2, LT-08412, Vilnius V21, Lithuania 3: Institute of Oceanography, College of Science, National Taiwan University, Taipei, 10617, Taiwan, ROC 4: Institute of Earth Sciences, Academia Sinica, Nankang, Taipei, 11529, Taiwan, ROC

Publication date: December 1, 2007

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