흑산도 연안에서 통발에 어획된 어류 종조성 및 연변동

Species Composition and Yearly Variation of Fish Collected by Fish Pots in Coastal Waters off Heuksan Island, Korea

Species composition and yearly variation of fish in coastal waters off Heuksan island were investigated using seasonal samples collected by fish pots from 2015 to 2017. A total of 269 fishes were sampled and classified into 25 species, 16 families, and 6 orders. The dominant species were Sebastes schlegelii (44 individuals, 11,790 g), followed by Conger myriaster (38 individuals, 5,240 g), and Hexagrammos agrammus (24 individuals, 2,650 g). By year, the highest number of individuals was found in 2015 (97 individuals, 15,107 g), while the lowest in 2017 (76 individuals, 11,364 g). The diversity index was the highest in 2015 (Hʹ=2.66) and the lowest in 2017 (Hʹ=2.42). The richness index was the highest in 2015 (RI=4.15) and the lowest in 2017 (RI=3.23). The evenness index was the highest in 2016 (J=0.90) and the lowest in 2015 (J=0.89). The dominance index was the highest in 2017 (D=34.2%) and the lowest in 2015 (D=29.9%). Highly economic species, such as Muraenesox cinereus, Conger myriaster, Sebastes schlegelii, Liparis tanakai, Pleuronichthys cornutus, and Takifugu rubripes, were caught.