Increasing gill raker numbers in juvenile and young skipjack tuna (<i>Katsuwonus pelamis</i>)

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  • Ohashi Shinpei
    国立研究開発法人水産研究・教育機構　国際水産資源研究所　かつお・まぐろ資源部
  • Chiba Satoru N.
    国立研究開発法人水産研究・教育機構　国際水産資源研究所　かつお・まぐろ資源部
  • Kiyofuji Hidetada
    国立研究開発法人水産研究・教育機構　国際水産資源研究所　かつお・まぐろ資源部

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Other Title
  • カツオ<i>Katsuwonus pelamis</i> の稚魚および幼魚期における鰓耙数の増加
  • カツオKatsuwonus pelamisの稚魚および幼魚期における鰓耙数の増加
  • カツオ Katsuwonus pelamis ノ チギョ オヨビ ヨウギョキ ニ オケル シハスウ ノ ゾウカ

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Abstract

<p>An increase in gill raker numbers in skipjack tuna (Katsuwonus pelamis) was observed during the development of juvenile and young stages (26–187 mm in standard length (SL)). Examination of 104 individuals showed obvious increments in number with growth, until 80–100 mm SL. Subsequently, numbers increased slowly (to 59 in the largest specimen), indicating that gill raker development in skipjack tuna is slower than in other scombrid fishes, such as Thunnus. However, gill raker numbers in juvenile and young skipjack tuna stages remain a useful taxonomic character.</p>

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