Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Evaluation of the optimal dissolved oxygen level for rainbow trout (Oncorhynchus mykiss) in the recirculating aquaculture system

순환여과 양식시스템 내 무지개송어(Oncorhynchus mykiss)의 적정 용존산소 농도평가

  • Kunhong PARK (Department of Fisheries Biology, Pukyong National University) ;
  • Jinseo CHOI (Department of Aquaculture and applied Life Sciences, National University) ;
  • Younghun LEE (Department of Fisheries Biology, Pukyong National University) ;
  • Jeonghwan PARK (Department of Aquaculture and applied Life Sciences, National University)
  • 박근홍 (부경대학교 대학원 수산생물학과) ;
  • 최진서 (부경대학교 양식응용생명과학전공) ;
  • 이영훈 (부경대학교 대학원 수산생물학과) ;
  • 박정환 (부경대학교 양식응용생명과학전공)
  • Received : 2023.10.31
  • Accepted : 2023.11.23
  • Published : 2023.11.30
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Abstract

Conventional aquaculture faces declining productivity, shifting to recirculating aquaculture system (RAS), known for minimizing water usage and maintaining consistent water temperatures for year-round fish growth. Rainbow trout (Oncorhynchus mykiss), a globally important cold-water species and the third most farmed fish in inland waters of Korea, valued for its fecundity and rapid growth. Dissolved oxygen, an important environmental factor affecting fish production and economics, highlights the need for smart aquaculture practices. Since 2018, the rise of intelligent aquaculture platforms, incorporating information and communications technology (ICT), emphasizes the essential role of RAS implementation. This eight-week study aimed to determine the optimal dissolved oxygen concentration for rainbow trout in RAS, utilizing a device for continuous monitoring, control and record. Dissolved oxygen concentrations were set at 5-6 mg/L, 9-10 mg/L, 14-15 mg/L and 17-18 mg/L. The growth rate significantly decreased at 5-6 mg/L, with no significant differences in other experimental groups. In hematological analysis, growth hormone (GH) was significantly highest at 5-6 mg/L, followed by 9-10 mg/L while Insulin-like growth factor-1 (IGF-1) was significantly lowest at 5-6 mg/L. In conclusion, the optimal dissolved oxygen concentration for rainbow trout in RAS is approximately 9-10 mg/L. Higher concentrations do not contribute to further growth or profitability.

Keywords

Acknowledgement

이 논문은 2021년도 정부(과학기술정보통신부)의 재원으로 정보통신기획평가원(IITP)의 지원을 받아 수행된 연구임(No.2021-0-00225, 최적의 수산 양식 설계·운영을 위한 디지털 아쿠아 트윈 핵심 플랫폼 기술 개발).

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