70 m3水槽を用いたクロマグロの陸上飼育

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書誌事項

タイトル別名
  • Rearing of Pacific Bluefin Tuna <I>Thunnus orientalis</I> in a 70 m<SUP>3</SUP> Land-based Tank System
  • 70 m<SUP>3</SUP> 水槽を用いたクロマグロの陸上飼育
  • 70m 3 スイソウ オ モチイタ クロマグロ ノ リクジョウ シイク

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抄録

Our ultimate aim is broodstock management and successful spawning of the Pacific bluefin tuna (PBT) Thunnus orientalis in small, land-based tanks. As a first step toward this goal, we conducted long-term rearing experiments using 0- to 1-year-old PBT in a 70 ｍ3 land-based tank. Given the high mortality observed in 2008 year-class PBT at low water temperatures (January-March; average water temperature, 13.6°C) in the 2008-2009 season, the average water temperature increased to 16.0°C during the same period when rearing 2009 year-class PBT. This increase in temperature prevented high PBT mortality during the low-water-temperature period. The 2009 year-class PBT (total length (TL), 44.5±7.9 cm; body weight (BW), 1.9±0.42 kg) attained lengths of 92.0 cm TL and weighed 13.0 kg BW after 16 months of rearing, which was comparable to PBT reared in marine net-pens. Histological analysis of PBT gonads revealed a significant increase of germ cell number. Moreover, type-B spermatogonia in testes and chromatin nucleolus stage oocytes in the ovary were observed in the 18-month-old PBT reared in this study. These results indicated that gonadal development, including proliferation and differentiation of the germ cells, had proceeded in PBT reared in the 70 ｍ3 land-based tank.

収録刊行物

  • 水産増殖

    水産増殖 59 (3), 473-481, 2011

    日本水産増殖学会

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