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Temporal and Spatial Variations and Species Composition of Ichthyoplanktons in a Sea Area, with the Construction of Artificial Upwelling Structure

인공용승류 해역에서 채집한 난자치어의 종조성 및 시공간 변동

  • Kwak, Seok-Nam (Environ-Ecological Engineering Institute Co., Ltd.) ;
  • Huh, Sung-Hoi (Department of Oceanography, Pukyong National University) ;
  • Kim, Ha-Won (Environ-Ecological Engineering Institute Co., Ltd.)
  • Received : 2013.03.21
  • Accepted : 2013.08.28
  • Published : 2013.08.31

Abstract

Temporal and spatial variations and species composition of ichthyoplanktons were investigated by Bongo net in a sea area with the construction of artificial upwelling structure at 13, June, 21 September, and 23 September in 2012. A total of fish eggs was 4,849 ind./$1,000m^3$, and fish larvaes was 641 ind./$1,000m^3$ in the study area. The common fish eggs was Engraulis japonicus which was composed of 57.5%, and unidentified I, II, III and IV were occurred with decreased number of individuals order. For fish larvaes, Pictiblennius yatabei, Repomucenus sp.A, sp.B and Scomber japonicus were dominated, however, other species were Engraulis japonicus, Konosirus puntatus, and unidentified I, II. Temporal variations of fish eggs and larvae were remarkable differed. Higher numbers of fish eggs and larvaes were July 2012, whereas those were lower at August 2012. Spatial variations of those were also significantly differed with higher numbers were at station 2 and 3 during study periods. The total number of fish eggs and larvae was about 4 fold against numbers of those in the compared area far from study area. These results indicated that higher numbers of fish eggs and larvaes were due to influx much more nutrients and food organisms with artificial upwelling.

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