Newcomers in the Baltic Sea: an attempt to trace the origins and whereabouts of thicklip grey mullet <Emphasis Type="Italic">Chelon labrosus</Emphasis> |
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Authors: | Matthias Schaber Lasse Marohn Christoph Petereit Jan P Schroeder Karsten Zumholz Reinhold Hanel |
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Institution: | 1.Institute of Sea Fisheries, Johann Heinrich von Thünen-Institut,Federal Research Institute for Rural Areas, Forestry and Fisheries,Hamburg,Germany;2.Leibniz Institute of Marine Sciences,IFM-GEOMAR,Kiel,Germany;3.Gesellschaft für Marine Aquakultur mbH,Büsum,Germany;4.Berufsbildungszentrum am Nord-Ostseekanal,Fischereischule,Rendsburg,Germany;5.Institute for Fisheries Ecology, Johann Heinrich von Thünen-Institut,Federal Research Institute for Rural Areas, Forestry and Fisheries,Hamburg,Germany |
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Abstract: | In recent years, thicklip grey mullet Chelon labrosus has shown increasing expansion of its native habitats in the north-eastern Atlantic into northerly adjacent areas including
the North Sea and the brackish Baltic Sea. Despite the regular annual and seasonal occurrence of C. labrosus in the western Baltic during the warm months, nothing is known of the origin or whereabouts of the mullet during the cold
season. As different possible migration scenarios can be considered, we performed otolith microchemistry analyses on specimens
from the western Baltic Sea to identify the origin of this nonindigenous species. Comparison with North Sea samples revealed
common habitat preferences and underlined the highly euryhaline nature of C. labrosus in different recently occupied habitats. Occasional fluctuations of Sr/Ca ratio along the growth axis suggest periodical
migration between waters of different salinities but did not reveal distinct migration pathways. |
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