Browse > Article
http://dx.doi.org/10.5657/kfas.2005.38.3.205

Distribution of the Deep Scattering Layer around Uljin Coastal Area  

HWANG Doo Jin (Department of Fisheries Science and Technology, Yosu National University)
KIM Dong Eon (Department of Fisheries Science and Technology, Yosu National University)
JEONG Sun Beom (Department of Fisheries Science and Technology, Yosu National University)
SON Yong Uk (Department of Fisheries Science and Technology, Yosu National University)
CHAE Jin Ho (Korea Environmental Research Centre for Hydrosphere)
CHO Ki Ryang (Department of Electronic Communication Engineering, Yosu National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.38, no.3, 2005 , pp. 205-213 More about this Journal
Abstract
A hydroacoustic and a close-open-close zooplankton net survey were conducted to understand the distribution characteristics of the deep scattering layer (DSL) and to estimate the density of zooplankton in the DSL, in the Uljin coastal area. The survey was carried out during March 13-14 and June 4-5, 2003 at each station for zooplankton. The vertical migration mechanisms of zooplankton are very variable to the taxa. In this study, after we grasp the vertical migration of zooplankton through the results of an echo-sounder survey, we verified the mechanisms of their vertical migration in the Uljin coastal area. Also, to estimate effectively the biomass of zooplankton, we researched the acoustic scattering strength according to the species. On the basis of these results, we devised a method for estimating zooplankton biomass through comparing net and echo-soundings. We obtained the results as a follows; 1) According to the examination of collections from the net sampling, in March, 2003, Euphausia pacifica comprised $38\%$ of zooplanktons inhabiting the sound scattering layer, while copepods, chaetognaths, and amphipods accounted for $29\%,\;23\%\;and\;10\%$, respectively. And in June, 2003, the ratio of E. pacifica was $51\%$, copepods $43\%$, and the others comprised $6\%$. In both March and June E. pacifica showed dominance among the species of zooplankton. 2) The analysis of vertical distribution through acoustic data in the scattering layer was more apparent in June (spring/summer) of 2003, than in March (winter/spring) of that year. The vertical migration of zooplankton peaked around sunrise and sunset in both March and June. 3) As for the sound scattering layer, it distributed in the open sea in March, and in the inland sea in June. Therefore it is suggested that some zooplankton species such as E. pacifica performed ontogenic horizontal migration througth the spring and early summer.
Keywords
Echo-sounder; Deep Scattering Layer; Zooplankton; Euphausia pacifica;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Aoki, I. and T. Inagaki. 1992. Acoustic observation of fish schools and scattering layers in a Kuroshio warm-core ring and its environments. Fish. Oceanogr., 1, 137-142   DOI
2 Hwang, D.J., H.H. Shin and D.H. Kang. 2002. Studies on fish distribution characteristics using a scientific echo sounder in the Yellow Sea. Bull. Kor. Soc. Fish. Technol., 38, 140-148   DOI   ScienceOn
3 Hwang, D.J., Y.J. Kim, H.H. Shin, Y.H. Yoon and C.H. Son. 2002. A study on fisheries resource in the East China Sea by hydroacoustic survey. Bull. Fish. Sci. Inst., Yosu Natl. Univ. 11, 76-82
4 Johannesson, K.A. and R.B. Mitson. 1983. Fisheries Acoustics (A practical manual for aquatic biomass estimation), FAO. Fisheries Technical Paper, pp. 240
5 Kang, D.H., D.J. Hwang, H.Y Soh, Y.H. Yoon, H.L. Suh, Y.J. Kim, H.C. Shin and K. Iida. 2003. Density Estimation of euphauiid (Euphausia pacifica) in the sound scattering layer of the East China Sea. J. Kor. Fish. Soc. 36, 749-756
6 Kang, D.H., D.J. Hwang and S.A. Kim. 1999. Biomass and distribution of Antarctic krill, Euphausia superba, in the northern part of the South Shetland Islands, Antarctic Ocean. J. Kor. Fish. Soc., 32, 737-747
7 KERCH. 2005. Ecology on the screen clogging of euphausiids at cooling water intakes of power plants. Report of Korea Ocean Research & Development Institute. pp 151
8 Lee, D.J., H.I. Shin and J.H. Park. 1990. Acoustic scattering layers in the East China Sea. I. Diurnal fluctuations in echo level of the scattering layers. Bull. Kor. Soc. Fish. Technol., 26, 14-19
9 Lee, K.H., T. Mukai, D.H. Kang and K. Iida. 2004. Application of acoustic Doppler current profiler combined with a scientific echo sounder for krill Euphausia pacifica density estimation. Fish. Sci., 70, 1051-1060   DOI   ScienceOn
10 McGehee, D.E., R.L. O'Driscoll and L.V.M. Traykovski. 1998. Effects of orientation on acoustic scattering from Antarctic krill at 120 kHz. Deep-Sea Res., II 45, 1273-1294
11 Mauchline, J. 1980. The biology of mysids and euphausiids. Adv. Mar. Biol., 18, 1-68l
12 Shin, H.H., D.J. Hwang and Y.J. Kim. 2002. Studies on the distribution of fisheries resources by bottom trawling in the Yellow Sea. Bull. Kor, Soc. Fish. Technol., 38, 129-139   DOI   ScienceOn
13 Hwang, D.J., D.H. Kang, Y.J. Kim, H.H. Shin and Y.H. Yoon. 2003. A Study on Fisheries Resource of the East China Sea in summer of 2002 by acoustic survey. Bull. Fish. Sci. Inst., Yosu Natl. Univ. 12, 11 0-117
14 Choi, S.G., J.Y. Kim, S.S Kim, Y.M. Choi and K.H. Choi. 2001. Biomass estimation of anchovy (Engraulis japonicus) by acoustic and trawl surveys during spring season in the Southern Korean Waters. J. Kor. Soc. Fish. Res., 4, 20-29
15 Chou, S.C., M.A. Lee and K.T. Lee. 1999. Diel vertical movement of the deep scattering layer on the continental slope of I-Lan Bay, Taiwan. Fish. Sci., 65, 694-699   DOI
16 Greene, C.H., Wiebe, P.H. Burczynski and M.J. Youngbluth. 1998. Acoustical detection of high-density krill layers in the submarine canyons off Georges Bank. Science 241, 359-361