Estimation of stock characteristic value of the red tilefish <I>Branchiostegus japonicus</I> offshore the Shimane Peninsula

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  • Matsumoto Hironori
    Inland Water Fisheries And Coastal Fisheries Division, Shimane Prefectural Fisheries Technology Center

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Other Title
  • 島根半島沖海域におけるアカアマダイの資源特性値
  • シマネ ハントウオキ カイイキ ニ オケル アカアマダイ ノ シゲン トクセイチ

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Abstract

Several stock characteristic values required to assess the population dynamics of red tilefish offshore the Shimane Peninsula were investigated from July 2003 to March 2019. Between July 2015 and November 2018, 663 individuals were collected as samples from Koizu Fishing Port. For all samples, the sex was identified; total length, body weight and gonad weight was measured; and age was estimated using otolith. The spawning season was estimated to be mid-May to end of September, and peaked in late September. Ages assessed were 2-14 years old for females, 2-16 for males, and the estimated growth curve equation was as follows; Lt=346 (1-exp-0.542(t+0.045)) for females and Lt=472 (1-exp-0.328(t+0.134)) for males. The total length composition by sex from April 2006 to March 2019 was estimated from catch records by size brand using these results. Each piece of information is useful for performing VPA (Virtual Population Analysis) and evaluation of the seed release effects.

Journal

  • Aquaculture Science

    Aquaculture Science 68 (3), 263-274, 2020

    Japanese Society for Aquaculture Science

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