Lime application techniques for invasive fish eradication in drained farm ponds

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  • 池干し時のため池の外来魚根絶を目的とした石灰散布技術の検討
  • イケ ボシ ジ ノ タメイケ ノ ガイライギョ コンゼツ オ モクテキ ト シタ セッカイ サンプ ギジュツ ノ ケントウ

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Abstract

<p>　We examined the fish toxicity of slaked lime, a strong alkaline agent that is used in invasive fish eradication operations in drained farm ponds. Lime exposure tests showed no substantial difference in 6-h lethal concentration among the four species used (two invasives and two natives). The addition of pond sediments to the lime water to simulate pond conditions significantly increased the lethal lime concentration but did not affect the lethal pH (~12.0). The sediment-added lethal-concentration lime water kept a high pH value even 2 weeks after preparation, while 50-fold or higher dilutions of the lime water showed a neutral pH value immediately after preparation. Based on these findings, we discuss the piscicidal properties of lime and techniques of applying lime to eradicate invasive fish in farm ponds.</p>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 85 (4), 421-428, 2019-07-15

    The Japanese Society of Fisheries Science

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