Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Impact of Pollution Sources on the Bacteriological Water Quality in the Yongnam-Gwangdo Shellfish Growing Area of Western Jinhae Bay, Korea

진해만 서부 용남·광도해역의 세균학적 수질에 미치는 육상 오염원의 영향

  • Shim, Kil Bo (Food & Safety Research Division, National Fisheries Research & Development Institute) ;
  • Ha, Kwang Soo (Southeast Sea Fisheries Research Institute, National Fisheries Research & Development Institute) ;
  • Yoo, Hyun Duk (Southeast Sea Fisheries Research Institute, National Fisheries Research & Development Institute) ;
  • Lee, Tae Seek (Southwest Sea Fisheries Research Institute, National Fisheries Research & Development Institute) ;
  • Kim, Ji Hoe (Food & Safety Research Division, National Fisheries Research & Development Institute)
  • 심길보 (국립수산과학원 식품안전과) ;
  • 하광수 (국립수산과학원 남동해수산연구소) ;
  • 유현덕 (국립수산과학원 남동해수산연구소) ;
  • 이태식 (국립수산과학원 남서해수산연구소) ;
  • 김지회 (국립수산과학원 식품안전과)
  • Received : 2012.09.05
  • Accepted : 2012.11.26
  • Published : 2012.12.31
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Abstract

To evaluate the bacteriological water quality in Yongnam-Gwangdo, located in western Jinhae Bay, seawater samples were analyzed using sanitary indicator bacteria at 57 sampling stations. According to survey results from January 2007 to December 2009, the range of the geometric mean and the estimated 90th percentile for coliforms and fecal coliforms in the samples were <1.8-16.5 and 1.8-246.8 MPN/100 mL and <1.8-7.1 and 1.8-74.8 MPN/100 mL, respectively. The samples, including those taken from stations located in Wonmunman, Gwangdo, and Dangdong, showed high levels of microbial contamination caused by the climate and weather patterns in the marine environment. The bacteriological water quality in the area met Korean criteria for a designated shellfish growing area for export and National Shellfish Sanitation Program criteria for an approved shellfish growing area, except at station #49. A total of 24 direct pollution sources were discharged into the shellfish growing area. The radius of impact was calculated for each pollution source to assess the effect on the shellfish growing area. The calculated radius of impact for most of the pollution sources was below 300 m. However, the radius of impact for the combined pollution sources in Kyeonnaeryang was 93-1973 m. There were significant differences between the calculated closed sea area and actual monitoring results. The closed sea area values calculated from the fecal coliform load in drainage water tended to be higher than the actual monitoring results. Tidal currents and environmental factors such as salinity, water temperature, sunlight, and microbiological factors affect the survival of fecal indicator bacteria in seawater.

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