흑산도 연안에서 기선저인망에 어획되는 어류의 종조성 및 양적변동

Species Composition and Quantitative Fluctuation of Fishes Collected by an Otter Trawl in Coastal Waters off Heuksan-do, Korea

Fluctuation in the abundance and species composition of fishes in the coastal waters of Heuksan-do, Shinan, Jeollanam-do, Korea were investigated from 2013 to 2015. A total of 2,044 fishes were sampled and classified into 94 species, 56 families, and 15 orders. The dominant species was Engraulis japonicus (217 individuals, 1,918 g), followed by Leiognathus nuchalis (198 individuals, 3,016 g), and Coilia nasus (121 individuals, 2,129 g). The highest number of individuals was found in 2013, while the biomass was the highest in 2015. The diversity index was the highest in 2013 (Hʹ=3.692) and the lowest in 2015 (Hʹ=3.561). The dominance index was the highest in 2015 (D=0.312) and the lowest in 2013 (D=0.220). The richness index was the highest in 2014 (RI=12.440) and the lowest in 2015 (RI=11.050). The economically important species in this area are Okamejei kenojei, Beringraja pulchra, Conger myriaster, Coelorinchus multispinulosus, Lophiomus setigerus, Sebastes schlegeli, Leiognathus nuchalis, Larimichthys polyactis, and Trichiurus lepturus.