plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111elSSN : 2287-8815
Spatiotemporal Distribution and Biomass Estimates of Fishes around theJeju Hanlim Wind Farm Using Fisheries Acoustics
김한수1,2·김미라1·강영철3·조성호1,2·강돈혁1*
1한국해양과학기술원 해양력강화·방위연구부, 2과학기술연합대학원대학교 KIOST스쿨, 3㈜제주오션
We investigated the spatiotemporal distribution and biomass of fishes around the Jeju Hanlim offshore wind farm using hydroacoustic methods. Acoustic surveys were conducted in April and October 2025 under daytime and nighttime conditions using a 200 kHz scientific echosounder. During the daytime, fishes were primarily concentrated near the bottom at depths of 20-30 m. In contrast, nighttime distributions were broader within the upper and middle water layers, indicating diel vertical migration behavior. Spatially, relatively high acoustic backscatter was observed in coastal areas and around wind turbine structures. These findings suggest that rocky bottoms and artificial structures provide favorable habitats for fish aggregation. Estimated total biomass was highest during daytime surveys in April (44.1 M/T) and lowest during nighttime surveys in April (11.0 M/T). Biomass estimates in October were 34.85 M/T during the daytime and 15.49 M/T during the nighttime. Overall, these findings indicate that hydroacoustic methods are effective for monitoring fish resources around coastal wind farms and provide useful baseline data for long-term ecological assessment and fisheries resource management.
Hydroacoustics, Coastal wind farm, Fish distribution, Biomass estimation, Jeju Hanlim