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Otolith microstructure of chum salmon Oncorhynchus keta: formation of sea entry check and daily deposition of otolith increments in seawater conditions

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Abstract

To apply otolith microstructure to examination of age and growth of juvenile chum salmon Oncorhynchus keta inhabiting coastal waters, formation of otolith increments was investigated for juveniles reared in a seawater aquarium and in net pens. In all otoliths examined, a distinctive check was formed at the time of sea entry of the fish. The deposition of otolith increments after the check was daily for rearing both in the aquarium (57 days) and in the net pens (26 days). Check formation associated with sea entry was also observed in otoliths of juvenile salmon collected 1 km off the coast of Shari, Hokkaido, Japan. Transmitted light observation of otoliths of those fish revealed a transition in otolith increment appearance from dark to light. Otolith Sr: Ca ratio remarkably changed from a low to a high level, coinciding with the transition in otolith appearance. It is suggested that the transition was associated with individual sea entry. This study demonstrated that the check and/or transition associated with sea entry are applicable to a benchmark for otolith increment counts of juvenile chum salmon inhabiting coastal waters.

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Authors and Affiliations

  1. National Salmon Resources Center, Fisheries Research Agency, 062-0922, Sapporo, Hokkaido, Japan

    Toshihiko Saito, Toshiki Kaga & Jiro Seki

  2. International Coastal Research Center, Ocean Research Institute, The University of Tokyo, 028-1102, Otsuchi, Iwate, Japan

    Tsuguo Otake

Authors
  1. Toshihiko Saito
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  2. Toshiki Kaga
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  3. Jiro Seki
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  4. Tsuguo Otake
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Correspondence to Toshihiko Saito.

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Saito, T., Kaga, T., Seki, J. et al. Otolith microstructure of chum salmon Oncorhynchus keta: formation of sea entry check and daily deposition of otolith increments in seawater conditions. Fish Sci 73, 27–37 (2007). https://doi.org/10.1111/j.1444-2906.2007.01298.x

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  • DOI: https://doi.org/10.1111/j.1444-2906.2007.01298.x

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