Growth Estimation of Reared Masu Salmon <i>Oncorhynchus masou</i> Using a Stereo Camera in a Sea Net Cage

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  • Yamazaki Yuto
    Graduate school of Fisheries Sciences, Hokkaido University
  • Ikegami Atsushi
    Graduate school of Fisheries Sciences, Hokkaido University FURUNO ELECTRIC CO., LTD. Research and Innovation Center
  • Watanabe Koukou
    Matsumae Town Hall
  • Noto Masaki
    Hokkaido Goverment, Oshima General Promotion Bureau Oshima District Fisheries Technology Extension Center Matsumae Branch
  • Takahashi Eisuke
    Field Science Center for Northern Biosphere Nanae Freshwater Station, Hokkaido University
  • Yamaha Etsuro
    Field Science Center for Northern Biosphere Nanae Freshwater Station, Hokkaido University
  • Takahashi Yuki
    Faculty of Fisheries Sciences, Hokkaido University
  • Komeyama Kazuyoshi
    Faculty of Fisheries Sciences, Hokkaido University

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Other Title
  • 海上生簀でのステレオカメラを使用した養殖サクラマスの成長推定
  • カイジョウ イケス デ ノ ステレオカメラ オ シヨウ シタ ヨウショク サクラマス ノ セイチョウ スイテイ

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<p>To establish a non-contact method to monitor the growth of masu salmon, Oncorhynchus masou, we filmed free-swimming farmed masu salmon in a sea cage using a stereo camera. Specifically, we released masu salmon at 1 and 3 years of age before and after spawning, respectively, into two sea cages installed in Matsumae-cho, Hokkaido, Japan. Individuals aged 1 and 3 years were reared for 202 and 221 days, respectively, in both groups, and fork length was measured using a stereo camera approximately every month from 10 December 2021. We observed an estimated growth of 21.2–31.7 cm and 36.8–40.6 cm for 1- and 3-year-old individuals, respectively. Both the predicted values and 95% prediction intervals of the growth curves for the two fish net cages were similar to the results of direct measurements after capturing the fish for landing. We observed an increase in the body sizes of the 3-year-old fish after they were allowed to spawn in sea cages; however, estimating their survival rates remained a challenge. This study allowed for a non-contact estimation of the size distribution of vulnerable for rubbing masu salmon cultured in sea cages.</p>

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