Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Survival and Physiological Response of Olive Flounder, Paralichthys olivaceus Exposed to Seawater Chlorinated by Chlorine Dioxide ($CIO_2$)

이산화염소($CIO_2$) 처리해수에 노출된 넙치, Paralichthys olivaceus의 생존과 생리적 반응

  • 김흥윤 (여수대학교 수산생명의학과) ;
  • 김진도 (국립수산과학원 여수수산종묘시험장)
  • Published : 2003.08.01
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Abstract

This study was conducted to estimate the effects of residual chlorine dioxide ($CIO_2$) in chlorinated seawater on survival and physiological responses (hematocrit: Ht, hemoglobin: Hb, serum electrolyte and glucose levels, and osmolality) of olive flounder, Paralichthys olivaceus. All the flounders were exposed for 10 min to different concentrations of residual $CIO_2$ just after chlorination for 1 min in each experimental aquarium (EA). ClO$_2$-free seawater was continuously supplied to each EA after 10 min exposure to $CIO_2$. By means of probit analysis, the median lethal times (LT$_{50}$, min) of flounder exposed to 0.43 and 0.51 ppm $CIO_2$, were at 103 and 32 min, respectively. In the range from 0.34 to 0.51 ppm $CIO_2$, the values of Ht, Hb, electrolytes and osmolality of fish exposed to $CIO_2$ were significantly elevated as elapsed time and residual concentrations of $CIO_2$ increased after chlorination. The levels of Ht, Hb, electrolytes and osmolality in flounder exposed to 0.27 ppm $CIO_2$ were not significantly different compared to control fish, which were maintained in $CIO_2$-free seawater; however, the levels of serum glucose were significantly increased with elapse times.

수온 2$0^{\circ}C$에서 넙치가 수용된 실험구에 ClO$_2$를 농도별로 처리하여 10분간 노출시킨 다음 해수를 유수하면서 넙치의 생존과 생리상태에 미치는 영향을 조사하였다. ClO$_2$ 처리직후의 잔류농도 0.51 ppm에서는 90분이 지나면 모든 개체가 사망하였고, 0.43 ppm에서는 3시간 후의 생존율이 13.3%, 0.34 ppm에서는 24시간이 경과하는 동안 평균 92.0%가 생존하였으며, 0.43과 0.51 ppm에서 넙치의 반수치사시간(($LT_{50}$)은 각각 103분과 32분이었다. 0.34~0.51 ppm $CIO_2$에 노출된 넙치의 Ht, Hb 및 혈청 전해질과 삼투질 농도는 $CIO_2$ 농도가 높고 노출 후 시간이 지날수록 대조군에 비해 유의하게 높은 값을 나타내었다. 0.27 ppm의 경우 Ht, Hb및 혈청 전해질과 삼투질 농도는 대조군과 차이는 없었으나 혈청 glucose 농도는 $CIO_2$ 노출 후 시간이 경과할수록 높아지는 현상을 보여 주었다. 또한 SS 농도가 높은 해수는 SS가 낮은 해수에 비해 잔류 $CIO_2$가 빠르게 환원되었다.

Keywords

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