Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Distribution of Indicator Bacteria in Seawater off the Coasts of Jeju Island and Pohang in 2017

2017년 동해안권역과 제주도권역 양식장 주변 해역의 오염지표세균의 분포

  • Roh, Heyong Jin (Department of Aquatic Life Medicine, Pukyong National University) ;
  • Kim, Nam Eun (Department of Aquatic Life Medicine, Pukyong National University) ;
  • Chun, Won-Kyong (Department of Aquatic Life Medicine, Pukyong National University) ;
  • Kim, Ahran (Department of Aquatic Life Medicine, Pukyong National University) ;
  • Lee, Yoonhnag (Department of Aquatic Life Medicine, Pukyong National University) ;
  • Kim, Youngjae (Korea Aquatic Biosecurity Technology (KABT)) ;
  • Hwang, Jee-Youn (Aquatic Life Disease Control Division, National Institute of Fisheries Science) ;
  • Kim, Do-Hyung (Department of Aquatic Life Medicine, Pukyong National University)
  • 노형진 (부경대학교 수산생명의학과) ;
  • 김남은 (부경대학교 수산생명의학과) ;
  • 천원경 (부경대학교 수산생명의학과) ;
  • 김아란 (부경대학교 수산생명의학과) ;
  • 이윤항 (부경대학교 수산생명의학과) ;
  • 김영재 ((주)한국수산방역기술) ;
  • 황지연 (국립수산과학원 방역과) ;
  • 김도형 (부경대학교 수산생명의학과)
  • Received : 2018.10.02
  • Accepted : 2018.12.06
  • Published : 2018.12.31
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Abstract

In 2017, total coliform (TC), fecal coliform (FC) and fecal Streptococci (FS) bacteria were examined in seawater samples collected at coastal sites on Jeju Island (Aewol as a control, Namwon, and Daejeong) and at Pohang (Yeongil as a control, Guryongpo-North, and Guryongpo-South) to examine the correlations between the density of fish farms and distributions of the indicator bacteria. Only a few TC, FC, and FS colonies were detected in all of the samples obtained from Jeju Island. Of note, 2,000 and 1,000 CFU of FS $100mL^{-1}$ were detected in samples from Guryongpo-South in June and August, respectively. Although the total area of approved fish farms located within 5 km of the sampling point at Guryongpo-South is 5-16 times smaller than in other regions, the number of indicator bacteria was highest in this region. Therefore, microbiological pollution in the Guryongpo-South region might be due to sources other than the effluent released from nearby fish farms.

Keywords

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Fig. 1. Sampling locations (white and red circles) used in this study. Note that three and five locations for Aewol and Yeongil (Control) and for Daejeong and Namwon in Jeju Island and Guryongpo-north and Guryongpo-south in Pohang, respectively. Red circles indicate the sampling location (within 5 m in diameter) where effluent water was released from a land-based olive flounder farm seawater. Purple triangles indicate the location of the sewage treatment plant.

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Fig. 2. Total coliform (TC), fecal coliforms (FC), and fecal streptococci (FS) counts in seawater sampled in Pohang. Red bars indicate sample harboring more than 43 and 41 CFU mL-1 of FC and FS, respectively. Capital letters (M, J, A and O) indicate May, June, August and October, respectively. CFU, Colony forming unit.

KSSHBC_2018_v51n6_697_f0003.png 이미지

Fig. 3. Total coliform (TC), fecal coliform (FC), fecal streptococci (FS) counts in seawater sampled in Jeju Island. Red bars indicate sample harboring more than 1,000, 43 and 41 CFU mL-1 of TC, FC and FS, respectively. Capital letters (M, J, A and O) indicate May, June, August and October, respectively. CFU, Colony forming unit.

KSSHBC_2018_v51n6_697_f0004.png 이미지

Fig. 4. Distribution of indicator bacteria (a total coliform, fecal coliforms, fecal streptococci) in seawater sampled in Pohang and Jeju Island. Different colors and circle sizes indicate different type of indicator bacteria, bacterial counts, and sampling time points. CFU, Colony forming unit.

Table 1. Sampling locations, water depth, water temperature, dissolved oxygen (DO) and salinity in seawater off the coast of Pohang

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Table 2. Sampling locations, water depth, water temperature, dissolved oxygen (DO) and salinity in seawater off the coast of Jeju Island

KSSHBC_2018_v51n6_697_t0002.png 이미지

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