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  • 1.
    Frie, Anne K
    et al.
    Institute of Marine Research, Tromso.
    Hammill, Mike O
    Maurice Lamontagne Institute, Quebec.
    Hauksson, Erlingur
    The Icelandic Seal Center.
    Lind, Ylva
    Swedish Museum of Natural History, Department of.
    Lockyer, Christina
    Age Dynamics, Denmark.
    Stenman, Olavi
    Observation of Marine mammals and Seabirds, Helsinki.
    Svetocheva, Olga
    Murmansk Marine Biological Institute.
    Error patterns in age estimation and tooth readability assignment of grey seals (Halichoerus grypus): Results from a transatlantic, image-based, blind-reading study using known-age animals2013In: ICES Journal of Marine Science, ISSN 1054-3139, E-ISSN 1095-9289, Vol. 70, no 2, p. 418-430Article in journal (Refereed)
  • 2.
    Lind, Ylva
    et al.
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Huovila, Tiina
    Department of Biosciences, University of Helsinki.
    Kälelä, Reijo
    Department of Bioscences, University of Helsinki.
    A retrospective study of fatty acid composition in Baltic herring (Clupea harengus membras) caught at three locations in the Baltic Sea (1973–2009)2017In: ICES Journal of Marine Science, ISSN 1054-3139, E-ISSN 1095-9289, article id fsx127Article in journal (Refereed)
    Abstract [en]

    Fatty acids (FAs) were analysed in Baltic herring (Clupea harengus membras) stored in the Swedish Environmental Specimen Bank for up to 40 years. The purpose was to evaluate the retrospective use of FA signatures to detect temporal and spatial changes in the Baltic ecosystem. Fish from northern and central Baltic captured in the 1970s, the 1980s, in 1990, 2000, and 2009 and stored at − 25 °C were analysed. From the 1980s and onward herring from the south Baltic were included. A total of 55 FA and 4 alkenyl chains (detected as dimethyl acetals) were identified, and 28 of these (present at > 0.5% by weight) were used in evaluation of the data. The amount of some 20–22 carbon polyunsaturated fatty acids (PUFA) was related to time with lower amounts in older samples while other PUFAs were not related to time. Principal component analysis with saturated FAs and monounsaturated FAs showed similar sample groupings as the one obtained by including the PUFAs. The differences found in herring FA in this longitudinal study could be attributed to location of sampling, year of collection and storage time. However, the clearly distinguishable pattern in the FA composition in herrings from different locations in the Baltic Sea seen at all decades indicate that this technique can be used retrospectively.

  • 3. Rohtla, Mehis
    et al.
    Silm, Maidu
    Tulonen, Jouni
    Paiste, Päärn
    Wickström, Håkan
    Kielman-Schmitt, Melanie
    Swedish Museum of Natural History, Department of Geology.
    Kooijman, Ellen
    Swedish Museum of Natural History, Department of Geology.
    Vaino, Väino
    Eschbaum, Redik
    Saks, Lauri
    Verliin, Aare
    Vetemaa, Markus
    Conservation restocking of the imperilled European eel does not necessarily equal conservation2020In: ICES Journal of Marine Science, ISSN 1054-3139, E-ISSN 1095-9289, p. 1-11Article in journal (Refereed)
    Abstract [en]

    To stop the decline of the European eel population, one of the measures taken is translocating eels for restocking, despite its conservational value being largely unknown. We aimed to contribute to this knowledge gap by (i) investigating the origin of eels caught in coastal waters of Estonia and Finland using otolith microchemistry and (ii) directly estimating restocked eel escapement from Narva River Basin District (NRBD), which is part of the primary Eel Management Unit in Estonia. In Estonia, 74% of the sampled eels (n=140) were natural recruits and 26% were restocked. In Finland, 27% of the sampled eels (n=235) were natural recruits and 73% were restocked. Only 1% of all the coastally collected eels were originally restocked to NRBD. These new data together with the reported commercial landings from the escapement route conflict with the current silver eel escapement estimation for NRBD and question the accuracy and value of such indirect calculations compiled for most Eel Management Units throughout the European Union. It is concluded that restocking eels to freshwaters may be futile as a conservation measure in some situations, and better escapement is likely achieved in restocking eels to coastal waters or undammed freshwater systems with a direct connection to the sea.

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