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Catch and reproductive biology of common octopus Octopus vulgaris in the coastal waters of Jeju Island, Korea

제주해역 참문어(Octopus vulgaris)의 어획실태와 생식생태

  • HAN, Song-Hun (Jeju Fisheries Research Institute, National Institute of Fisheries Science) ;
  • KO, Jun-Chul (Jeju Fisheries Research Institute, National Institute of Fisheries Science) ;
  • KIM, Min Sun (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)
  • 한송헌 (국립수산과학원 제주수산연구소) ;
  • 고준철 (국립수산과학원 제주수산연구소) ;
  • 김민선 (국립수산과학원 제주수산연구소) ;
  • 김보연 (국립수산과학원 제주수산연구소) ;
  • 최정화 (국립수산과학원 제주수산연구소)
  • Received : 2022.02.21
  • Accepted : 2022.03.30
  • Published : 2022.05.31

Abstract

The purpose of this study is to provide information about annual variations in catch size and changes in reproductive biology in the common octopus, Octopus vulgaris, a commercially important species in Jeju Island. Samples were collected from coastal waters of Jeju Island, Korea by coastal trap fishery from January to November 2021. Octopus vulgaris have been decreasing in this region since 1984. The mantle length (ML) ranged from 4.5 to 17.8 cm and body weight (BW) ranged form 88.5 to 2,657.5 g. A χ2-test revealed that the number of males was significantly greater than females (χ2 = 32.712, df = 10, P<0.05). Mature females were found from January to July and male occurred January to August. The gonadosomatic index value was higher from July to August than other months. The relationship between mantle length and body weight was BW = 2.4527ML2.3139 (female) and BW = 2.6785ML2.3159 (male). At 50% group maturity, female and male average weight was estimated to be 554.7 g and 330.6 g, respectively.

Keywords

Acknowledgement

본 연구는 국립수산과학원(R2022038)의 지원에 의해 수행되었습니다.

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