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Imre Taal Martin Kesler Lauri Saks Mehis Rohtla Aare Verliin Roland Svirgsden Kristiina Jürgens Markus Vetemaa Toomas Saat 《Helgoland Marine Research》2014,68(2):373-377
In the eastern Baltic rivers, anadromous salmonid parr are known to smoltify and migrate to the sea from March until June, depending on latitude, climate and hydrological conditions. In this study, we present the first records of autumn descent of brown trout Salmo trutta and Atlantic salmon Salmo salar from the Baltic Sea Basin. Otolith microchemistry analyses revealed that these individuals hatched in freshwater and had migrated to the brackish water shortly prior to capture. The fish were collected in 2006, 2008, 2009 and 2013 from Eru Bay (surface salinity 4.5–6.5 ‰), Gulf of Finland. This relatively wide temporal range of observations indicates that the autumn descent of anadromous salmonids is not a random event. These results imply that autumn descent needs more consideration in the context of the effective stock management, assessment and restoration of Baltic salmonid populations and their habitats. 相似文献
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Evidence of Atlantic salmon Salmo salar fry movement between fresh water and a brackish environment
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I. Taal M. Rohtla L. Saks R. Svirgsden M. Kesler L. Matetski M. Vetemaa 《Journal of fish biology》2017,91(2):695-703
This study reports descent of Atlantic salmon Salmo salar fry from their natal streams to brackish waters of the Baltic Sea and their use of this environment as an alternative rearing habitat before ascending back to freshwater streams. To the authors' knowledge, residency in a brackish environment has not previously been demonstrated in S. salar fry. Recruitment success and evolutionary significance of this alternative life‐history strategy are presently not known. 相似文献
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Mehis Rohtla Lagle Matetski Imre Taal Roland Svirgsden Martin Kesler Päärn Paiste Markus Vetemaa 《Journal of fish biology》2020,97(5):1582-1585
For the first time, an overlooked aspect of partial migration was quantified using otolith microchemistry and brown trout, Salmo trutta, as a model species. Relative contributions of freshwater resident and anadromous female brown trout to mixed-stock sea trout populations in the Baltic Sea were estimated. Out of 236 confirmed wild sea trout sampled around the coast of Estonia 88% were of anadromous maternal origin and 12% were of resident maternal origin. This novel finding underscores the importance of the resident contingent in maintaining the persistence and resilience of the migratory contingent. 相似文献
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