Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Buoyancy and Vertical Distribution of Mackerel Scomber japonicus Eggs in Korean Waters

한국 연근해 고등어(Scomber japonicus) 알의 비중과 수직분포

  • Jung, Kyung-Mi (Fisheries Resources Management Division, National Fisheries Research & Development Institute) ;
  • Kang, Sukyung (Fisheries Resources Management Division, National Fisheries Research & Development Institute) ;
  • Cha, Hyung Kee (Subtrophic Fisheries Research Center, National Fisheries Research & Development Institute) ;
  • Choi, Kwang Ho (Fisheries Resources Management Division, National Fisheries Research & Development Institute) ;
  • Myksvoll, Mari S. (Oceanography, Institute of Marine Research)
  • 정경미 (국립수산과학원 자원관리과) ;
  • 강수경 (국립수산과학원 자원관리과) ;
  • 차형기 (국립수산과학원 아열대수산연구센터) ;
  • 최광호 (국립수산과학원 자원관리과) ;
  • Received : 2013.10.18
  • Accepted : 2013.11.28
  • Published : 2013.12.31
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Abstract

This study simulated the egg vertical distribution of mackerel Scomber japonicus in Korean waters using general numerical models. All eggs were spawned naturally by raising broodfishes (May-June 2013), and the egg specific gravity was measured by a density-gradient column. CTD surveys provided environmental data (e.g., temperature and salinity) in May near Jeju Island, Korea. The egg specific gravity during the early stages ranged from 1.0203-1.0211. In general, the fertilized eggs showed a gradual decline in egg specific gravity until full development of the main organs, with a sudden increase just before hatching. Modeled egg vertical distributions were influenced more by wind speed than by egg buoyancy and vertical structure of the sea water. During calm and normal wind speeds, the eggs were distributed from the surface to 25-m depths. Under strong wind conditions (three times higher than the normal speed), the egg concentration on the surface decreased, and the egg distributional depth was deeper (~50 m).

Keywords

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