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<p>The Japanese eel, <i>Anguilla japonica</i>, is an economically important aquaculture fish, but the mass production of artificial seedlings is still in the developmental stage. One of the most important issues for producing more eel seedlings is to increase tank size. In this context, we investigated the effect of tank diameter and axis length. We found that it was possible to increase tank size by extending the axis of the tanks, and achieved rearing performance comparable to that of small experimental tanks. Based on this result, a new cylindrical tank prototype with an axis length of 1500&#xa0;mm and diameter of 400&#xa0;mm was manufactured, with subsequent rearing data showing that larvae reared in this new tank showed better growth than those in the previous large-scale tank. The tank structure was then refined and changed to a semi-cylindrical design. In addition, tank components were changed to use fiber-reinforced plastics (FRP), with the aim to produce low-cost tanks on a large scale. This enabled long-term rearing experiments to be conducted in the new FRP tanks, the results of which demonstrated that approximately 1000 glass eels could be produced in each tank, with survival rates of around 4%. These results provide useful information for the establishment of eel seedling production at a commercial scale in the near future.</p>

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The development of a new tank for mass production of eel seedlings

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • Ryusuke Sudo,
  • Takashi Yatabe,
  • Masataka Satomi,
  • Ryutaro Takasaki,
  • Keisuke Uezumiya,
  • Mitsuo Takahashi,
  • Kazuharu Nomura,
  • Hideki Tanaka

摘要

The Japanese eel, Anguilla japonica, is an economically important aquaculture fish, but the mass production of artificial seedlings is still in the developmental stage. One of the most important issues for producing more eel seedlings is to increase tank size. In this context, we investigated the effect of tank diameter and axis length. We found that it was possible to increase tank size by extending the axis of the tanks, and achieved rearing performance comparable to that of small experimental tanks. Based on this result, a new cylindrical tank prototype with an axis length of 1500 mm and diameter of 400 mm was manufactured, with subsequent rearing data showing that larvae reared in this new tank showed better growth than those in the previous large-scale tank. The tank structure was then refined and changed to a semi-cylindrical design. In addition, tank components were changed to use fiber-reinforced plastics (FRP), with the aim to produce low-cost tanks on a large scale. This enabled long-term rearing experiments to be conducted in the new FRP tanks, the results of which demonstrated that approximately 1000 glass eels could be produced in each tank, with survival rates of around 4%. These results provide useful information for the establishment of eel seedling production at a commercial scale in the near future.