ウナギ卵・仔魚の飼育における銀イオンの添加 : 毒性と抗菌作用 Toxicity and antibacterial activity of silver ions in the rearing water of Japanese eel eggs and larvae

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ウナギ卵の孵化と仔魚の生残,成長に及ぼす銀イオンの影響を調べた。硝酸銀の濃度 0.1 mg/L 以上で孵化率は低下したが,仔魚の生残率は 1 mg/L でも 24 時間は 0 mg/L の対照区と変わらなかった。抗菌作用は 1 mg/L 以上で認められた。最大 1 mg/L の硝酸銀を水に 1 日 4 回添加し仔魚を飼育すると,飼育槽壁面の生菌数は銀添加区で有意に低かった。しかし,飼育水中の生菌数は銀添加区も対照区も差がなかった。長期飼育では,60 日齢まで添加区の生残率は対照区より有意に高く,銀添加の効果が認められた。<br>

  To apply the antibacterial activity of silver ions to the rearing of Japanese eel <i>Anguilla japonica</i> larvae, we tested the effects of exposure to silver ions on hatching, survival and growth in eel larvae. Hatching rate of eggs was significantly decreased at a silver nitrate concentration of higher than 0.1 mg/L in rearing water (<i>p</i><0.01), whereas the survival rates of 0 or 5-day-old larvae were not influenced by exposure to the same condition for 120 hours. However, the survival rates of those larvae were decreased by exposure to 1 mg/L silver nitrate for more than 24 hours. During long-term rearing experiments, the number of bacteria on the wall of the rearing tank was significantly reduced by intermittently (four times a day) adding silver nitrate (max. 1 mg/L) to rearing water, and larval survival rate at the early stage (5 to 60-day-old) became significantly higher than that in the normal rearing method (<i>p</i><0.05). Growth was not influenced by adding silver nitrate, and six larvae in the silver-added tank finally metamorphosed into glass eels without any morphological anomalies. These results suggest that the use of silver ions in rearing eel larvae can facilitate the efficient production of artificial glass eels.<br>

収録刊行物

  • 日本水産學會誌 = Bulletin of the Japanese Society of Scientific Fisheries

    日本水産學會誌 = Bulletin of the Japanese Society of Scientific Fisheries 75(5), 786-792, 2009-09-15

    日本水産學會

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各種コード

  • NII論文ID(NAID)
    10025021939
  • NII書誌ID(NCID)
    AN00193422
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00215392
  • NDL 記事登録ID
    10445825
  • NDL 雑誌分類
    ZR26(科学技術--農林水産--水産)
  • NDL 請求記号
    Z18-345
  • データ提供元
    CJP書誌  NDL  IR  J-STAGE 
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