The aim of this research is to enhance the bottom environment of Geoje fish farm that has been severely contaminated. Treatment of microbial agent and/or calcium oxide significantly changed that environment: in ignition loss, either treatment (25% or 21%)showed better than mixed treatment (13.2%). In COD, the oxygen releasing agent or mixed treatment reduced the index by more than 20%. In T-P and T-N, the effects of CaO2 on them were overwhelming (50% or more) meanwhile that of the microbial agent on them was less than 20%. Also, CaO2 influenced on the microbial flora: Desulfobvibrio thermophilus, a sulfate reducing bacterium decreased in number, considering the increase of pH and rise of redox potential. In contrast, Pseudomonas sp., Pseudoalteromonas sp., Pseudomonas aeruginosa were remarkably dominant over other species with mixed treatment as a PCA analysis confirmed it.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 실험재료
  2.2. 시료채취
  2.3. 화학적 분석
  2.4. 미생물군집 분석
 3. 결과 및 고찰
  3.1. CaO2 및 미생물제재의 단일·혼합 처리에 따른 효율성 관찰
  3.2. CaO2 및 미생물제재 단일·혼합 처리에 따른 미생물 군집변화
  3.3. 미생물 군집의 유사성 관찰
 4. 결 론
 참 고 문 헌

• 권성현(경상대학교 해양과학대학 해양환경공학과 해양산업연구소) | Sung-Hyun Kwon (Department of Marine Environmental Engineering, Gyeongsang National University, Institute of Marine industry) Corresponding author
• 배환진(경상대학교 해양과학대학 해양환경공학과 해양산업연구소) | Hwan-Jin Bae (Department of Marine Environmental Engineering, Gyeongsang National University, Institute of Marine industry)
• 조대철(순천향대학교 에너지환경공학과) | Daechul Cho (Department of Energy & Environmental Engineering, Soonchunhyang University)