Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Experimental Chemical Treatments for the Control of Dinoflagellate Cochlodinium polykrikoides in the Land-based Culture of Olive Flounder Paralichthys olivaceus

넙치 육상수조 양식에 있어 편조류 Cochlodinium polykrikoides의 구제를 위한 화학적 처리

  • Ryu, Ho-Young (National Fisheries Research and Development Institute) ;
  • Shim, Jeong-Min (East Sea Regional Fisheries Research Institute, National Fisheries Research and Development Institute) ;
  • Bang, Jong-Deuk (National Fisheries Research and Development Institute) ;
  • Lee, Chu (East Sea Regional Fisheries Research Institute, National Fisheries Research and Development Institute)
  • 류호영 (국립수산진흥원) ;
  • 심정민 (국립수산진흥원 동해수산연구소) ;
  • 방종득 (국립수산진흥원) ;
  • 이주 (국립수산진흥원 동해수산연구소)
  • Published : 1998.08.01
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Abstract

When Cochlodinium polykrikoides came into the culture tanks through influent cultivated water during the red tides, hundred thousands of commercial flounders were concomitantly killed and many culturists suffered from a great deal of financial loss in the east coast of Korea. It is charactrized by high sinking rate after sunset and the formatino of clump which results in oxygen deficiency by its respiration at tank bottom under condition. We investigated the efficacy of hydrogen peroxide and chlorine dioxide, known to form radicals, for extermination of red tide organism C. polykrikoides. When C. polykrikoides seawater with a density of 6,000 cells/$m\ell$ was treated with 14, 28 and $42mg/\ell$ of hydrogen peroxide, its survival rate was markedly decreased to 9.8, 0.8 and 0.3% respectively immediately after 6 hours of treatments whereas when it was treated with 1.5, 2.1 and $3.0mg/\ell$ chlorine dioxide, its survival rate showed 87.7, 81.3 and 80.1 and 80.1% respectively at the same treatment time. Hydrogen peroxide was the effective agent since it has scarcely injured the cultured olive flounder when exposed to the tested concentration range of $14~28mg/\ell$ with the extermination of almost3 C. polykrikoides during the experimental period of 5 days and has shown the oxygen increase of approximately $1.23mg/\ell$ 2 hours immediately after the flounder by C. polykrikoides in the land-based culture tank is assumed to be not by the toxicity of itself but by oxygen dificiency from the rapid respiration of dinoflagellate clump sunken to the tank bottom.

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References

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