Fisheries and Aquatic Sciences

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Density estimation of euphausiids and copepods by using a multi-frequency method

  • Woo Seok Oh (Institute of Low-Carbon Marine Production Technology, Pukyoung National University) ;
  • Geun Chang Park (Department of Fisheries Physics, Pukyong National University) ;
  • Jung-Hwa Choi (Dokdo Fisheries Research Center, National Institute of Fisheires Science) ;
  • Hyoung Been Lee (Fisheries Resources Research Center, National Institute of Fisheries Science) ;
  • Kyounghoon Lee (Division of Marine Production System Management, Pukyong National University)
  • Received : 2023.07.18
  • Accepted : 2023.09.11
  • Published : 2023.12.31
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Abstract

This study used a multi-frequency acoustic method to assess the density and spatial distribution of dominant zooplankton, euphausiids and copepods, which are representative species of the zooplankton immigrating the sea around Republic of Korea. Acoustic surveys were carried out in the East Sea and South Sea from June 16 to 29, 2017, using the research vessel Tamgu 20th from the National Institute of Fisheries Science. From the results of the acoustic survey, the distribution of euphausiids was relatively higher in the East Sea than in the South Sea. Additionally, although the distribution of copepods was low in all areas, they were abundant in certain areas in the East Sea and the southern area of the Jeju Sea. Euphausiid and copepod density was estimated to be 1.2 g/m2 (CV = 19.1%) and 2.8 g/m2 (CV = 23.5%), respectively.

Keywords

Acknowledgement

This research were funded by grant from National Institute of Fisheries Science, Korea (2023001) and was partially supported the project titled "Development of AI Based Smart Fisheries Management System (No. 20210499)" funded by the Ministry of Oceans and Fisheries, Korea. We are grateful to two anonymous reviews for helpful improving this paper.

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