황해 주요해역에서 저층트롤을 활용한 수산자원의 종 조성 및 변동 특성
Species Composition and Variation of Fishery Resources Collected by Bottom Trawling in the Yellow Sea of Korea
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
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.
Abstract
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.