Age and Growth of the Starspotted Dogfish <i>Mustelus manazo</i> from Tokyo Bay, Japan

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  • Yamaguchi Atsuko
    Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Taniuchi Toru
    Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Shimizu Makoto
    Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo

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  • Age and Growth of the Starspotted Dogfish,Mustelus manazo from Tokyo Bay,Japan
  • Age and Growth of the Starspotted Dogfi

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Abstract

Age and growth of the starspotted dogfish Mustelus manazo in Tokyo Bay were examined from centrum analysis using soft x-radiography. Based upon seasonal centrum edge analysis, a dark ring was formed annually, mostly in June. The von Bertalanffy growth equations were described as follows, male; Lt=1241[1-exp{-0.120(t+2.59)}], female; Lt=1341[1-exp{-0.113(t+2.55)}], where Lt is total length in mm and t is age in years. The maximum age was 8 years old for males and 10 years old for females. The growth until 2 years was similar in both sexes, but over 2 years females tended to grow larger than males. Sex ratios were approximately 1:1 until age class 4; after age class 5 the proportion of males was reduced.

Journal

  • Fisheries science

    Fisheries science 62 (6), 919-922, 1996

    The Japanese Society of Fisheries Science

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