Spatial Distribution of Sound Scattering Layer and Density Estimation of Euphausia pacifica in the Center of the Yellow Sea Bottom Cold Water Determined by Hydroacoustic Surveying SCIE SCOPUS

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Title
Spatial Distribution of Sound Scattering Layer and Density Estimation of Euphausia pacifica in the Center of the Yellow Sea Bottom Cold Water Determined by Hydroacoustic Surveying
Author(s)
Kim, Han Soo; Kim, Ga Ram; Kim, Mi Ra; Kang, Don Hyug
KIOST Author(s)
Kim, Han Soo(김한수)Kim, Ga Ram(김가람)Kim, Mi Ra(김미라)Kang, Don Hyug(강돈혁)
Alternative Author(s)
김한수; 김가람; 김미라; 강돈혁
Publication Year
2022-01
Abstract
The Yellow Sea Bottom Cold Water (YSBCW) refers to seawater with a water temperature of 10 °C or less found at the bottom of the center of the Yellow Sea. The spatiotemporal variability of the YSBCW directly affects the distribution of organisms in the marine ecosystem. In this study, hydroacoustic and net surveys were conducted in April (spring) to understand the spatial distribution of the sound scattering layer (SSL) and estimate the density of Euphausia pacifica (E. pacifica) in the YSBCW. Despite the shallow water in the YSBCW region, E. pacifica formed an SSL, which was distributed near the bottom during the daytime; it showed a diel vertical migration (DVM) pattern of movement toward the surface during the nighttime. The mean upward and downward swimming speeds around sunset and sunrise were approximately 0.6 and 0.3–0.4 m/min, respectively. The E. pacifica density was estimated in the central, western, and eastern regions; the results were approximately 15.8, 1.3, and 10.3 g/m2, respectively, indicating significant differences according to region. The results revealed high-density distributions in the central and eastern regions related to the water temperature structure, which differs regionally in the YSBCW area. Additional studies are needed regarding the spatial distribution of E. pacifica in the YSBCW and its relationship with various ocean environmental parameters according to season. The results of this study contribute to a greater understanding of the structure of the marine ecosystem in the YSBCW.
ISSN
2077-1312
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/42030
DOI
10.3390/jmse10010056
Bibliographic Citation
Journal of Marine Science and Engineering , v.10, no.1, 2022
Publisher
MDPI AG
Keywords
diel vertical migration; sound scattering layer; spatial and regional distributions; Yellow Sea Bottom Cold Water
Type
Article
Language
English
Publisher
MDPI AG
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