Growth, spawning and migration of hatchery-reared Japanese sandfish Arctoscopus japonicus released in Nanao Bay and Toyama Bay

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  • TOMODA TSUTOMU
    Notojima Station, National Center for Stock Enhancement, Fisheries Research Agency
  • HOTTA KAZUO
    Toyama Prefectural Fisheries Research Institute
  • MORIOKA TAIZO
    Akkeshi Station, National Center for Stock Enhancement, Fisheries Research Agency

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Other Title
  • 七尾湾および富山湾で放流したハタハタ人工種苗の成育，産卵と移動
  • ナナオワン オヨビ トヤマワン デ ホウリュウ シタ ハタハタ ジンコウ シュビョウ ノ セイイク サンラン ト イドウ

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Abstract

  This study was conducted to investigate the ecology of hatchery-reared Japanese sandfish Arctoscopus japonicus. In April 2000, a total of 6,966 fish (mean total length 10.4 cm) were tagged and released in Nanao Bay off Ishikawa Prefecture and Toyama Bay off Toyama Prefecture. A total of 123 fish (1.8%) were recaptured over a long period of time until January 2005. Maturity (ejaculation and ovulation) was recognized in male and female recaptured fish of 2 years. Concerning the items of the recaptured fish, adult fish of 2 years and over considered as the spawning stock accounted for more than 90 percent of all those recaptured. In two releasing trials, more than half (50.8, 55.2%) of the recaptured fish remained in Toyama Bay and most of the others (33.8, 41.3%) moved northward from the release site and recaptured offshore of Niigata, Yamagata and Akita Prefectures. These results indicate that hatchery-reared sandfish released in Nanao Bay and Toyama Bay mainly remain, grow up and spawn in Toyama Bay, and some sandfish migrate northward and interchange with stock of the northern Sea of Japan or the Niigata area.<br>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 72 (6), 1039-1045, 2006

    The Japanese Society of Fisheries Science

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