천수만 주변해역에 출현하는 부유성 어란 및 자치어의 분포특성
Distribution characteristics of egg and ichthyoplankton in the Cheonsu Bay, Korea
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초록
천수만 주변해역에서 위치한 3개 정점에서 2020년부터 2021년까지 격월로 연 6회에 걸쳐 부유성 어란 및 자치어를 채집하였다. 조시기간 중 수온염분변화는 표층 수온은 8월에 28.4℃로 가장 높았으며, 2월에는 4.7℃로 낮게 나타났다. 어란은 멸치가 28,211 ind./1,000 ㎥로 출현량의 85.6%로 가장 우점하였고, 자치어는 망둑어과 2,499 ind./1,000 ㎥로 출현량의 37.0%, 다음은 반지가 1,730 ind./1,000 ㎥로 출현량의 25.6%가 출현하여 우점하였다. 생태학적 지수는 다양도지수가 0.354-1.704, 균등도지수는 0.497-0.951, 우점도지수는 0.490-1.000, 풍부도지수가 0.191-1.253로 나타났으며, 자치어의 월별 유사도는 6월과 8월이 하계그룹으로 가장 유사하게 나타났다.
Abstract
To provide information needed for managing fish resources and protecting the ecosystem of Cheonsu Bay, bimonthly variations in species composition and abundance of fish eggs and larvae were investigated. The samples were collected by using bongo net at three different stations from February 2020 to December 2021. Fish eggs were divided into Engrualis japonicus and unidentified eggs, of which Engragulis japonicus accounted for 85.6% of the total eggs collected. A total of 21 species representing 17 families and 6 orders were collected. The three dominant species were Gobiidae spp, Thryssa hamiltonii and E. japonicus and these three species accounted for 74.1% in the total number of individuals. The number of species was highest in August, 2020 and lowest in February, 2020 and 2021; the number of individuals was highest in August, 2020 and lowest in February, 2020. Temporal changes in the abundances of pelagic eggs and larval fishes corresponded with temperature.
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