The relationship between the behavior of fish school, Jack mackerel <i>Trachurus japonicus</i> and oceanic conditions in Tateyama Bay, Chiba Prefecture, Japan

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  • NEMOTO Masao
    Department of Ocean Sciences, Tokyo University of Marine Science and Technology
  • SHIBUYA Katsumasa
    Department of Ocean Sciences, Tokyo University of Marine Science and Technology
  • NAKANO Haruka
    Department of Ocean Sciences, Tokyo University of Marine Science and Technology Training Vessel Seiyo-Maru, Tokyo University of Marine Science and Technology
  • FURUMI Takuro
    Department of Ocean Sciences, Tokyo University of Marine Science and Technology
  • JOSHIMA Hiroki
    Training Vessel Seiyo-Maru, Tokyo University of Marine Science and Technology
  • MIYAZAKI Tadashi
    Training Vessel Seiyo-Maru, Tokyo University of Marine Science and Technology
  • KITADE Yujiro
    Department of Ocean Sciences, Tokyo University of Marine Science and Technology

Bibliographic Information

Other Title
  • 千葉県館山湾におけるマアジの魚群行動と海洋構造
  • チバケン タテヤマワン ニ オケル マアジ ノ ギョグン コウドウ ト カイヨウ コウゾウ

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Abstract

In this study, the relationship between the behavior of fish school, Jack mackerel Trachurus japonicus and oceanic conditions was investigated in Tateyama Bay, Chiba Prefecture, Japan. We showed that the fish school entered from offshore to the inside of Tateyama Bay with the flood tide inflow of water masses having lower temperature and higher salinity at the bottom layer. The fish school appeared in the inside of Tateyama bay along with mixed water masses of Tokyo Bay, Sagami Bay, and the offshore Kuroshio water. The Kuroshio water mass was distributed over the depth from several tenth of meter to around 100 m depth off Tateyama Bay. These results indicated that the fish school behaves with a diurnal tidal cycle in accordance with the movement of the Kuroshio water, and as a result, Jack mackerel was fished near the bottom layer where the mixed water was flowed into the bay.

Journal

  • La mer

    La mer 55 (1-2), 1-10, 2017

    The Japanese-French Oceanographic Society

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