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Preliminary study on spatio-temporal variations of five giant and 17 large fish species around the Korean peninsula from 2011 to 2016

  • Kim, Jin-Koo (Division of Fisheries and Life Sciences, Pukyong National University) ;
  • Kim, Hyung Chul (Fisheries Resources and Environment Research Division, West Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Ryu, Jung-Hwa (Ryujunghwa Marine Research Institute) ;
  • Ahn, Ji-Suk (Oceanic Climate and Ecology Research Division, National Institute of Fisheries Science)
  • Received : 2022.02.14
  • Accepted : 2022.04.13
  • Published : 2022.05.31

Abstract

Although giant and large fish species are highly important as a keystone species in the marine ecosystem, there have been no or few studies on their spatio-temporal variations around the Korean peninsula. For this, we analyzed daily reports made by observers at 57 fishery landing sites in Korea over 6 years, from 2011 to 2016. In total, 153 fish species were re-identified based on photos and descriptions recorded by Korean observers, of which five species were classified as a giant fish over 5 m in maximum total length (MTL) and 17 species as a large fish from 3 m to 5 m MTL according to the data presented by Froese & Pauly (2021). Among the giant and large fish species, Mola mola was the most abundant species, with 75 individuals landed as by-catch. The second most abundant species was Isurus oxyrinchus (31), followed by Mobula mobular (23), Lamna ditropis (17), Masturus lanceolatus (16), Sphyrna zygaena (14), and Prionace glauca (12). As a result of cluster analysis based on the number of individuals of giant and large fish species by year and sea, six years were separated into two clusters (2011-2013 vs. 2014-2016), with high contribution of M. mola, I. oxyrinchus, and M. lanceolatus; and three seas were separated into two clusters (eastern + southern seas vs. western sea), with high contribution of M. lanceolatus, L. ditropis, and I. oxyrinchus. The largest number of M. mola accounted for 64% of the total in 2014 and 2016, and 71% in summer (June-August). It is assumed to have a correlation between seawater temperature fluctuation and the occurrence of giant and large fish species. Our study highlights importance of longterm monitoring of giant and large fish species, and can help to understand the life cycle such as natal or nursery migration of giant and large fish species around the Korean peninsula.

Keywords

Acknowledgement

We sincerely thank Kim Hae-Sol, Hwang Seon-Jae and all Korean observers (Korea Fisheries Resources Agency) for providing long term data on giant and large fish species occurrence, and anonymous reviewers for their valuable comments.

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