Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Reproduction and distribution of Chionoecetes crabs (C. opilio and C. japonicus) in the East Sea

동해에 서식하는 대게류(Chionoecetes spp.)의 재생산 및 분포 특성

  • Cha, Hyung Kee (Dokdo Fisheries Research Center, East Sea Fisheries Research Institute, National Fisheries Research and Development Institute) ;
  • Yang, Jae Hyeong (Dokdo Fisheries Research Center, East Sea Fisheries Research Institute, National Fisheries Research and Development Institute) ;
  • Lee, Sung Il (Fisheries Resources Management Division, National Fisheries Research and Development Institute) ;
  • Yoon, Sang Chul (Fisheries Resources Management Division, National Fisheries Research and Development Institute)
  • 차형기 (국립수산과학원 동해수산연구소 독도수산연구센터) ;
  • 양재형 (국립수산과학원 동해수산연구소 독도수산연구센터) ;
  • 이성일 (국립수산과학원 자원관리과) ;
  • 윤상철 (국립수산과학원 자원관리과)
  • Received : 2014.09.18
  • Accepted : 2014.10.07
  • Published : 2014.10.31
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Abstract

Two Chionoecetes crabs, C. opilio and C. japonicus are primary targets of trap fisheries in the East Sea. To promote the sustainable management of these species, we investigated their reproductive biology and spatial distribution based on samples collected in standardized traps in the coastal waters of eastern Korea from September 2007 to August 2008. The estimated spawning season of C. opilio was March-April, whereas that of C. japonicus continued year-round. The estimated molting period of both species was September-October. Fecundity of C. opilio was proportional to female, size, ranging from 44,791 to 151,538 eggs, and the estimated body size at 50% sexual maturity was 63.9 mm carapace width. Egg bearing female C. opilio were mostly collected depths of 200-300 m, particularly off Hupo and Chuksan, suggesting that these areas are their major spawning grounds. In contrast, female C. japonicus were mostly collected at depths of 400-600 m, peaking at 600 m. The species-specific catch rate was higher for C. opilio above 400 m, similar at ca. 450 m, and higher for C. japonicus below 500 m. These vertical differences indicate apparent spatial segregation of the species, suggesting that spatially-explicit fisheries management plans may be necessary for mitigating conflicts between the respective crab fisheries and maintaining these crabs.

Keywords

References

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