Age determining character and growth of a sea urchin Pseudocentrotus depressus.

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  • アカウニの年齢形質と成長
  • アカウニ ノ ネンレイ ケイシツ ト セイチョウ

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Abstract

Age Determining Character and Growth of a Sea Urchin Pseudocentrotus depressus<br>Nobutaka Kakuda*1<br>The growth of a sea urchin Pseudocentrotus depressus was investigated using dark brown zones in the fifth genital plate as an age determining character. The dark brown zones which were arbitrarily referred to as ring marks were first ascertained to be an age determining character, i.e. they were formed once a year (from June to October) and there is a significant correlation between the width of the fifth genital plate and that of each annual ring mark.<br>The relationship between the test diameter (D, mm) and the width of the fifth genital plate (R, mm) was expressed by the following equation: R=0.30768+0.04161D-0.00008D2. Based on these results, growth formulae for the test diameter (Dt, mm) and total weight(Wt, g)were adequately expressed by the Von Bertalanffy's equations: <br>Dt=84.1(1-e-0.3442(t-0.3617)), Wt=209.0(1-e-0.3442(t-0.3617))2.8793<br>respectively. Seasonal changes in colour of the marginal zone of the genital plate revealed that the white opaque zone and the dark brown zone were formed in the faster plate growth period (from November to May) and in the slower plate growth period (from June to October), respectively.

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 55 (11), 1899-1905, 1989

    The Japanese Society of Fisheries Science

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