plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111elSSN : 2287-8815
Species Composition and Variation of Fishery Resources Collected by Bottom Trawling in the Yellow Sea of Korea
임병권·박치완1*·김상규2·최상준3·양수정4·오우석5·박경동6·박근창5·이사라5·김지연5·이경훈7
한국수산자원공단 수산자원본부 자원회복실, 1국립부경대학교 해양생산관리학부 수산물리학전공, 2한국수산자원공단 제주본부 사업관리실, 3한국수산자원공단 수산자원본부 생명자원실, 4한국수산자원공단 동해본부 사업관리실, 5국립부경대학교 어업기술안전연구소, 6㈜수산자원생태연구소, 7국립부경대학교 해양생산시스템관리학부
In this study, we investigated species composition and variation of fishery resources in the central Yellow Sea of Korea through bottom trawl surveys conducted in May and November 2022 and 2023, and June and November 2024. Twenty sampling stations were surveyed to analyze species diversity, biomass, and environmental factors including temperature and salinity. Results revealed significant interannual and seasonal fluctuations. Total species numbers increased from 41 in 2022 and 31 in 2023 to 55 in 2024, while total individuals rose sharply from 762 and 684 to 2,409, respectively. However, total catch weight decreased from 311,798.9 g in 2022 and 260,944.8 g in 2023 to 173,392.2 g in 2024, indicating a shift toward smaller-sized species. Dominant species composition also changed notably. Lophius litulon and Liparis tanakae dominated in 2022, while L. litulon remained dominant in 2023. By 2024, Crangon affinis, Scomber japonicus and Engraulis japonicus increased substantially. Environmental analysis showed decreased mean bottom temperature and slightly increased salinity by 2024, influencing species distribution and biomass patterns. These findings suggest that combined effects of climate variability, habitat conditions, and fishing pressure are reshaping species composition and stock structure, providing valuable insights for sustainable management and conservation of Yellow Sea fishery resources.
Yellow Sea, Bottom trawl, Fishery resources, Species composition, Environmental variation