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2023 Vol.45, Issue 3 Preview Page

Article

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

하계 완도 주변 육상 양식장 배출수 중 유기탄소 및 영양염의 분포 특성

GyuRi Kim1
,
Yujeong Choi2
,
Tae–Hoon Kim1*
김 규리1
,
최 유정2
,
김 태훈1*
1Department of Oceanography, Chonnam National University, Gwangju, 61186, Korea
2Research Institute for Basic Sciences, Chonnam National University, Gwangju 61186, Korea
1전남대학교 지구환경과학부 해양환경전공 (61186) 광주광역시 북구 용봉로 77
2전남대학교 기초과학연구소 (61186) 광주광역시 북구 용봉로 77
*Corresponding Author
30 September 2023. pp. 103-111
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Abstract

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.

Keywords
organic carbon
dissolved inorganic nutrients
colored dissolved organic matter
land-based fish farms
Wando
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국문 참고자료의 영문표기 English translation / Romanization of references originally written in Korean

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Information
  • Publisher :Korea Institute of Ocean Science and Technology
  • Publisher(Ko) :한국해양과학기술원
  • Journal Title :Ocean and Polar Research
  • Journal Title(Ko) :Ocean and Polar Research
  • Volume : 45
  • No :3
  • Pages :103-111
  • Received Date : 2023-07-27
  • Revised Date : 2023-09-05
  • Accepted Date : 2023-09-11
  • DOI :https://doi.org/10.4217/OPR.2023013
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