한국 동해에 서식하는 대게류(Chionoecetes spp.) 유생의 수직 분포 특성
Vertical Distribution Characteristics of Snow Crab Chionoecetes spp. Larvae in the East Sea
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The vertical distribution of snow crab Chionoecetes spp. larvae in the East Sea were investigated in April 2021 using the Multiple Opening/Closing Net and Environmental Sensing System (MOCNESS). The water temperature ranged from 0.86 to 17.2°C, and salinity from 34.0 to 34.7 psu. Zoea I and II occurred range from 29 to 1,982 inds.103 m-3 at 10 stations, and range from 4 to 11 inds.103 m-3 at 3 stations, separately. Therefore, Zoea I occurred in wider area and higher density than Zoea II at all stations. In the vertical distribution of larvae, all zoeal stages were mainly distributed in the 30–40 m strata, and the larvae showed nocturnal vertical migration similar to that of most zooplankton. Zoea I appeared in the range from 13.7 to 15.8°C and occurred at the highest density of 1982 inds.103 m-3 at 14°C. And Zoea II appeared range from 13.4 to 14.5°C and occurred in the highest density of 11 inds.103 m-3 at 13.4°C. In conclusion, the early larval stage (zoea I) occurred at a higher range of sea surface temperature than later larval stage (zoea II).
Abstract
The vertical distribution of snow crab Chionoecetes spp. larvae in the East Sea were investigated in April 2021 using the Multiple Opening/Closing Net and Environmental Sensing System (MOCNESS). The water temperature ranged from 0.86 to 17.2°C, and salinity from 34.0 to 34.7 psu. Zoea I and II occurred range from 29 to 1,982 inds.103 m-3 at 10 stations, and range from 4 to 11 inds.103 m-3 at 3 stations, separately. Therefore, Zoea I occurred in wider area and higher density than Zoea II at all stations. In the vertical distribution of larvae, all zoeal stages were mainly distributed in the 30–40 m strata, and the larvae showed nocturnal vertical migration similar to that of most zooplankton. Zoea I appeared in the range from 13.7 to 15.8°C and occurred at the highest density of 1982 inds.103 m-3 at 14°C. And Zoea II appeared range from 13.4 to 14.5°C and occurred in the highest density of 11 inds.103 m-3 at 13.4°C. In conclusion, the early larval stage (zoea I) occurred at a higher range of sea surface temperature than later larval stage (zoea II).
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