Ocean and Polar Research

  • 제45권3호
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  • Pages.103-111
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  • 2023
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  • 1598-141X(pISSN)
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  • 2234-7313(eISSN)
한국해양과학기술원 (Korea Institute of Ocean Science & Technology)
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하계 완도 주변 육상 양식장 배출수 중 유기탄소 및 영양염의 분포 특성

Distribution Characteristics of Organic Carbon and Nutrient in Effluent of Land-based Aquaculture Farms around Wando in Korea

  • 김규리 (전남대학교 지구환경과학부 해양환경전공) ;
  • 최유정 (전남대학교 기초과학연구소) ;
  • 김태훈 (전남대학교 지구환경과학부 해양환경전공)
  • GyuRi Kim (Department of Oceanography, Chonnam National University) ;
  • Yujeong Choi (Research Institute for Basic Sciences, Chonnam National University) ;
  • Tae–Hoon Kim (Department of Oceanography, Chonnam National University)
  • 투고 : 2023.07.27
  • 심사 : 2023.09.11
  • 발행 : 2023.09.30
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초록

To evaluate the impact of effluents from land-based fish farms on the coastal ocean of Wando, Korea, we analyzed inorganic nutrients, particulate organic carbon (POC), dissolved organic carbon (DOC), and colored dissolved organic matter (CDOM) in the effluent and influent of land-based fish farms during the summer (July) of 2021. The average concentrations of nutrients (Dissolved inorganic nitrogen, phosphorus, and silicate; DIN, DIP, and DSi, respectively) in the effluents of this study area were 17±3.7 μM, 1.4±0.7 μM, and 14±1.6 μM, respectively. The average concentrations of POC and DOC were 37±22 μM and 81±13 μM, respectively, with POC accounting for about 30% for total organic carbon in effluents. The Reduced Dissolved Inorganic Nitrogen/Total Dissolved Inorganic Nitrogen ratio (0.7), potential short-period index, indicates that the discharge of nutrients excreted by the fish and unconsumed feed into coastal water results in such nutrients being deposited and accumulated in the sediment. Subsequently, this continuous accumulation triggers the release of ammonium ions during organic matter decomposition, and the ammonium-enriched waters that encroach on fish farms as influent seem to be due to the diffusion of high concentrations of ammonium from bottom sediment. Furthermore, we used fluorescence indices to examine the characteristics of organic matter sources, obtaining mean values of 1.54±0.19, 1.06±0.06, and 1.56±0.06 for the humification index, biological index, and fluorescence index, respectively, in the effluent. These results indicate that the organic matters had an autochthonous origin that resulted from microbial decomposition, and such organic matters were rapidly generated and removed by biological activity, likely supplied from the sediment. Our results suggest that the effluent from land-based fish farms could be a potential source of deoxygenation occurrence in coastal areas.

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과제정보

이 논문은 2022년 해양수산부 재원으로 해양수산과학기술진흥원의 지원을 받아 수행된 연구입니다(전남씨그랜트).

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