Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Effect of Turbid Water on Fishes in the Streams of Imha Reservoir

임하호 유입지천에 서식하는 어류에 미치는 탁수의 영향

  • Yu, Sam-Hwan (Department of Biological Science, Andong National University) ;
  • Kim, Jeong-Sook (Department of Biological Science, Andong National University) ;
  • Shin, Myung-Ja (Department of Biological Science, Andong National University) ;
  • Lee, Jong-Eun (Department of Biological Science, Andong National University) ;
  • Seo, Eul-Won (Department of Biological Science, Andong National University)
  • 유삼환 (안동대학교 자연과학대학 생명과학과) ;
  • 김정숙 (안동대학교 자연과학대학 생명과학과) ;
  • 신명자 (안동대학교 자연과학대학 생명과학과) ;
  • 이종은 (안동대학교 자연과학대학 생명과학과) ;
  • 서을원 (안동대학교 자연과학대학 생명과학과)
  • Published : 2009.10.30
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Abstract

The present study aims to examine the effect of turbid water on fishes in streams which branch into a turbid water area (Yeongyang-gun) and a non-turbid water area (Cheongsong-gun), and finally flow into the Imha reservoir. In a comparison of water quality, the chemical status of the water showed higher pH, DO and SS in the turbid water area than in the non-turbid water area. Also, high density of clay minerals such as vermiculite (V) and illite (I), which is from clay mineral leakage during rainfall, was detected in turbid water, resulting in an increase of turbidity. Fishes inhabiting the turbid water showed irregular spaces in gill lamella, cell separation, edema, and clubbing in epithelial tissues. Also, the gill surface showed roughness and plenty of muddy debris substances inside the gills. The Bowman's space was expanded because of contraction of the glomerulus in the Bowman's space of the kidney tissues. Antioxidant enzymes such as SOD, CAT, GPX, and GST showed higher activities in the specific tissues, muscles and kidney, of fishes living in turbid water than in the non-turbid area. We suggested that; first, the antioxidant activities were increased due to removal of harmful radicals generated in fish bodies in the turbid water area, second, long-time exposure of these histological changes in the tissues might have induced secondary lesion accompanying the inaccurate physiological constancy of fishes.

본 연구는 탁수가 어류에 미치는 영향을 분석하기 위하여 임하호 유입지천인 탁수수계(영양군 화매천)와 비탁수수계(청송군 신흥천)의 수질, 토양성분 및 어류의 조직 생리적 변화를 조사하였다. 임하호 유입지천의 수질은 탁수수계에서 pH, DO, SS 및 탁도가 높았으며, 토양성분은 vermiculite (V), illite (I)와 같은 점토광물이 높은 것으로 보아 점토광물이 강우시 쉽게 유출되어 탁수에 영향을 줄 것으로 생각된다. 탁수수계에 서식하는 어류는 이차새변의 간격이 일정하지 않고, 상피세포의 분리와 부종 및 곤봉 형태가 관찰되었다. 또한 아가미 표면이 매끄럽지 못하며 다량의 이물질이 존재하였고, 신장 조직에서는 보우먼주머니 안의 사구체 크기가 수축되어 보우만 공간이 넓은 형태를 나타냈다. 이러한 조직학적 변화가 장기간 지속될 경우 어류의 2차 병변의 원인이 될 수 있으며, 더 나아가 어류의 건강상에 영향을 줄 것으로 사료된다. 항산화효소의 활성은 탁수수계에서 높은 활성을 보이며, GR은 항산화효소의 활성중 가장 낮은 활성을 나타냈다. 또한 탁수수계의 근육과 신장조직에서는 SOD, CAT, GPX, GST가 비탁수수계 보다 높은 활성을 보였다. 이는 활성산소가 많이 발생하는 탁수수계의 어류 체내에서는 유해한 라디칼을 제거하기 위해 항산화효소의 활성이 증가한 것으로 생각된다.

Keywords

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