Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Removal of Fecal Indicator Bacteria from Bivalves under Natural and Electrolyzed Water

패류 중 자연정화 및 인공정화에 의한 위생지표세균의 변화

  • Oh, Eun-Gyoung (Food Safety Research Division, National Fisheries Research & Development Institute) ;
  • Yoo, Hyun-Duk (Southeast Sea Fisheries Research Institute, National Fisheries Research & Development Institute) ;
  • Yu, Hong-Sik (Food Safety Research Division, National Fisheries Research & Development Institute) ;
  • Ha, Kwang-Soo (Southeast Sea Fisheries Research Institute, National Fisheries Research & Development Institute) ;
  • Shin, Soon-Bum (Food Safety Research Division, National Fisheries Research & Development Institute) ;
  • Lee, Tae-Seek (Southwest Sea Fisheries Research Institute, National Fisheries Research & Development Institute) ;
  • Lee, Hee-Jung (Food Safety Research Division, National Fisheries Research & Development Institute) ;
  • Kim, Ji-Hoe (Food Safety Research Division, National Fisheries Research & Development Institute) ;
  • Son, Kwang-Tae (Food Safety Research Division, National Fisheries Research & Development Institute)
  • 오은경 (국립수산과학원 식품안전과) ;
  • 유현덕 (국립수산과학원 남동해수산연구소) ;
  • 유홍식 (국립수산과학원 식품안전과) ;
  • 하광수 (국립수산과학원 남동해수산연구소) ;
  • 신순범 (국립수산과학원 식품안전과) ;
  • 이태식 (국립수산과학원 남서해수산연구소) ;
  • 이희정 (국립수산과학원 식품안전과) ;
  • 김지회 (국립수산과학원 식품안전과) ;
  • 손광태 (국립수산과학원 식품안전과)
  • Received : 2011.08.10
  • Accepted : 2012.01.31
  • Published : 2012.02.29
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Abstract

In coastal areas that are affected by continuous, seasonal or occasional pollution sources, bivalves accumulate biological contaminants such as pathogenic bacteria. We investigated the effect of natural seawater relaying and electrolyzed seawater depuration on the bacteriological quality of artificially contaminated oysters Crassostrea gigas and short-necked clams Ruditapes philippinarum to suggest an alternative method of shellfish sanitation control.When artificially contaminated oysters and short-necked clams (fecal coliform level 1,700 MPN/100 g) were relayed into a sea area of safe bacteriological water quality, the fecal coliform level dropped to below 110 MPN/100 g after 1 day. The bacteriological quality of oysters and short-necked clams that are contaminated at a fecal coliform level of 1,700 MPN/100 g could be improved, and become appropriate for raw consumption by a single day relay under proper environmental conditions. When artificially contaminated oysters (fecal coliform level 330 MPN/100 g) were depurated with electrolyzed seawater, 94% of fecal coliform was eliminated after 12 h and fecal coliform was undetectable after 24 h. After 24 h depuration with electrolyzed seawater, the fecal coliform level of short-necked clams with initial fecal coliform of 2,400 MPN/100 g was below 20 MPN/100 g. However, the fecal coliform level of short-necked clams with initial fecal coliform of 17,000 MPN/100 g was relatively high, at 790 MPN/100 g, even after 24 h of depuration with electrolyzed seawater, because of the repeated cycle of excretion and accumulation of fecal coliform in shellfish tissue under the closed depuration environment. Such natural seawater relaying and electrolyzed seawater depuration can be restrictively applied to improve or secure the bacteriological quality of oysters and short-necked clams in accordance with safety levels for bivalves for raw consumption.

Keywords

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  2. Evaluation of the Effects of the Inland Pollution Sources after Rainfall Events on the Bacteriological Water Quality in Narodo Area, Korea vol.45, pp.5, 2012, https://doi.org/10.5657/KFAS.2012.0414
  3. Norovirus Quantification in Oysters Crassostrea gigas Collected from Tongyeoung, Korea vol.47, pp.5, 2014, https://doi.org/10.5657/KFAS.2014.0501