Subsequent Changes in the Thymus of Ayu Plecoglossus altivelis Reared from Juveniles with Temperature-induced Differential Thymus Growth

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  • Takada Yuzo
    Laboratory of Aquatic Medicine, School of Veterinary Medicine, Nippon Veterinary and Life Science University
  • Taguchi Kosei
    Laboratory of Aquatic Medicine, School of Veterinary Medicine, Nippon Veterinary and Life Science University
  • Suzuki Kyuma
    Gunma Prefectural Fisheries Experiment Station
  • Ashizawa Akihiko
    Yamanashi Prefectural Fisheries Technology Center
  • Kaji Koichi
    Yamanashi Prefectural Fisheries Technology Center
  • Watanabe Shun
    Gunma Prefectural Fisheries Experiment Station
  • Wada Shinpei
    Laboratory of Aquatic Medicine, School of Veterinary Medicine, Nippon Veterinary and Life Science University
  • Kurata Osamu
    Laboratory of Aquatic Medicine, School of Veterinary Medicine, Nippon Veterinary and Life Science University

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タイトル別名
  • Subsequent Changes in the Thymus of Ayu <i>Plecoglossus altivelis</i> Reared from Juveniles with Temperature-induced Differential Thymus Growth

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<p>The temperature of water used to rear juvenile stages of ayu affects the development of the thymus. ​However, subsequent differences in the thymus in adults after rearing juveniles at different temperatures are unclear. ​We analyzed thymus development of ayu grown at a constant water temperature of 15°C from juveniles reared at different water temperatures. ​Juvenile ayu weighed at 0.6 g and 1.4 g were reared at different temperatures (10°C, 12°C, 15°C, 18°C and 22°C) for 64 days and 54 days, respectively, and then held at 15°C for analysis of the thymus development. ​Thymus volume was measured by computed tomography and thymus development of experimental fish was evaluated as the ratio of thymus volume to body length. ​The thymus volume ratios of juveniles immediately after rearing at lower water temperatures (10°C, 12°C) were higher than in those reared at the higher temperatures (18°C, 22°C). ​These levels of thymus volume ratio were preserved in grown ayu continuously reared at 15°C. ​After the summer solstice, the thymus began to atrophy and no longer exhibited differences among the experimental groups. ​Thus the thymus formed at the juvenile stage retains its morphological properties until the summer solstice.</p>

収録刊行物

  • 魚病研究

    魚病研究 55 (2), 31-37, 2020-06-15

    日本魚病学会

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