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Preliminary results on the reproduction of a deep-sea snailfish Careproctus rhodomelas around the active hydrothermal vent on the Hatoma Knoll, Okinawa, Japan

Authors

  • A. Takemura,

    Corresponding author
    1. Department of Biology, Chemistry, and Marine Sciences, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan
      Tel.: +81 98 895 8993; email: takemura@sci.u-ryukyu.ac.jp
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  • S. Tamotsu,

    1. Department of Biological Sciences, Faculty of Sciences, Nara Women's University, Kitauoyanishimachi, Nara 630-8506, Japan
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  • T. Miwa,

    1. Marine Technology Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima, Yokosuka, Kanagawa 237-0061, Japan
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  • H. Yamamoto

    1. Institute of Biogeoscience, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima, Yokosuka, Kanagawa 237-0061, Japan
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Tel.: +81 98 895 8993; email: takemura@sci.u-ryukyu.ac.jp

Abstract

Deep-sea snailfish Careproctus rhodomelas were collected from an active hydrothermal vent using a remotely operated vehicle (R.O.V. Hyper-dolphin) and a pressurized device (Deep-Aquarium). Careproctus rhodomelas exhibited a cystovarian-type ovary containing a small number of developing oocytes at different stages, suggesting that the fish is a batch-spawner that spawns large eggs (c. 6·0 mm) several times within its life span. In vitro culture of the oocytes in the presence of human chorionic gonadotropin showed that oestradiol-17β production fluctuated with oocyte development, suggesting that the oocytes were at the vitellogenic stage.

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