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

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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A seasonal characteristic of fish assemblage in the coastal waters Gapa-do, southern part of Jeju Island

제주도 남부 가파도 연안 어류군집의 계절별 특성

  • KO, Jun-Cheol (Jeju Fisheries Research Institute, National Institute of Fisheries Science) ;
  • HAN, Song-Heon (Jeju Fisheries Research Institute, National Institute of Fisheries Science) ;
  • KIM, Bo-Yeon (Jeju Fisheries Research Institute, National Institute of Fisheries Science) ;
  • CHOI, Jung-Hwa (Jeju Fisheries Research Institute, National Institute of Fisheries Science) ;
  • HWANG, Kang-Seok (Fisheries Resources Research Center, National Institute of Fisheries Science)
  • 고준철 (국립수산과학원 제주수산연구소) ;
  • 한송헌 (국립수산과학원 제주수산연구소) ;
  • 김보연 (국립수산과학원 제주수산연구소) ;
  • 최정화 (국립수산과학원 제주수산연구소) ;
  • 황강석 (국립수산과학원 수산자원연구센터)
  • Received : 2020.08.24
  • Accepted : 2020.10.30
  • Published : 2021.02.28
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Abstract

A seasonal characteristic of fish assemblages in the coastal waters of Gapa-do was determined using samples collected by a trammel net from 2015 to 2019. Annual mean temperature and salinity were 18.9℃, 33.6 psu (2015), 19.5℃, 33.6 psu (2016), 18.9℃, 33.8 psu (2017), 18.8℃, 34.5 psu (2018) and 19.5℃, 33.7 psu (2019), which show a stable water mass. During the survey period, a total of 50 species (30 families and 8 orders) of fishes were identified, including Scorpaeniformes (3 families and 9 species) and Perciformes (18 families and 29 species) that accounted for 68% of the total number. The number of species was higher in summer than in winter, showing the peak in the summer by 35 species and the low in the winter by 20 species. The number of individuals and the biomass peaked in the summer by 690 individuals and 151.4 kg, and were the lowest in the autumn by 336 individuals and 76.6 kg. The annual diversity index, evenness index and richness index were appeared to be 2.54-2.75, 0.68-0.76 and 5.32-6.65 at each stations. The dominance index was appeared to be the highest in 2018 and the lowest in 2015. Marbled rockfish (Sebastiscus marmoratus), rock fish (Sebastes inermis), filefish (Stephanolepis cirrhifer), rabbit fish (Siganus fuscescens), porcupine fish (Diodon holocanthus) and smallscale blackfish (Girella melanichthys) were dominant species, which occurred abundantly during the entire survey period. Subtropical fishes were identified as a total of 24 species (48.0%) and the number of species was higher in 2019 by 20 (60.6%) species and lower in 2015 by 13 (44.8%) species. The dominant species of the subtropical fishes were appeared to be rabbit fish, porcupine fish, smallscale blackfish, flag fish (Goniistius zonatus), stripey (Microcanthus strigatus), grunter (Parapristipoma trilineatum), and bluestriped angelfish (Chaetodontoplus septentrionalis) at the study sites.

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