Age determination of chum salmon using scales and otoliths

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  • KANETO YURIKO
    Graduate School of Agricultural Science, Tohoku University
  • KATAYAMA SATOSHI
    Graduate School of Agricultural Science, Tohoku University
  • IIDA MASAYA
    Japan Sea National Fisheries Research Institute, Japan Fisheries Research and Education Agency

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  • サケの耳石と鱗による年齢査定法の検討
  • サケ ノ ジセキ ト ウロコ ニ ヨル ネンレイ サテイホウ ノ ケントウ

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Abstract

<p>　Age determination of chum salmon using scales becomes difficult as sexual maturation progresses. We examined and compared the working efficiency and accuracy of aging methods using scales, otolith surface, and otolith section with chum salmon. The percentage of age estimated correctly, cross-checked with known age by the otolith thermal mark and release protocol, was under 80% for the otolith surface and the common otolith sectioning methods in which otoliths are sliced to around 150 μm thickness. The accuracies were 100% using scales and thinner otolith sections of around 80 μm thickness. We therefore recommend employing the more accurate aging methods using scales and thinner otolith sections in line with the working efficiency and maturational conditions.</p>

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