Microchemistry of the Statoliths of the Japanese Common Squid <i>Todarodes pacificus</i> with Special Reference to its Relation to the Vertical Temperature Profiles of Squid Habitat

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  • Ikeda Yuzuru
    Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University
  • Arai Nobuaki
    Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University
  • Sakamoto Wataru
    Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University
  • Kodokoro Hideaki
    Japan Sea National Fisheries Research Institute, Suido-cho
  • Yoshida Koji
    Division of Nuclear Engineering, Graduate School of Engineering, Kyoto University

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  • Microchemistry of the Statoliths of the Japanese Common Squid Todarodes pacificus with Special Reference to its Relation to the Vertical Temperature Profiles of Squid Habitat
  • Microchemistry of the Statoliths of the

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Abstract

Trace elements in the statoliths of the Japanese common squid Todarodes pacificus were analyzed with PIXE (Particle Induced X-ray Emission) to investigate the environmental fluctuations that squid encountered in the ocean. To examine the quantitative relationship between the trace elements of T. pacificus statoliths and the vertical temperature profile of squid habitat, the samples were collected from three geographical regions taking account of water temperature distribution in the Sea of Japan: cold water region, intermediate water region and warm water region. Calcium was detected from T. pacificus statoliths as the main component, and other trace elements such as chromium, manganese, iron, copper, zinc and strontium were detected. The Sr concentration was the highest among those trace elements in the statoliths. In contrast, Cr, Mn, Fe, Cu and Zn were contained at relatively low levels in the statoliths. Sr concentration in the statoliths was high in the group of the cold water region, and the intermediate water region, but was low in the group of the warm water region. It was suggested that the Sr concentration of T. pacificus statoliths could be the key to reconstructing the water region of squid habitat which is expressed by the vertical temperature profile.

Journal

  • Fisheries science

    Fisheries science 64 (2), 179-184, 1998

    The Japanese Society of Fisheries Science

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