This study was conducted on October 23, 2020 at the Cheongpyeong Reservoir located in Seorakmyeon, Gapyeong-gun, Gyeonggi-do, and analyzed the horizontal and vertical distribution patterns of fish based on data obtained using fishfinder. The total surface area of fishfinder survey conducted was 782,853 m2, and where the water depth (WD) ranges from 10 m to 12 m is widest which 31.7% of total surface area. As a result of the heat map analysis, fish density was highest at right bank under the Gapyeong-bridge, but there was no specific pattern in horizontal distribution of fish. As a result of vertical distribution of fish analysis, 86.6% of fishes are observed at below 6 m of the fish depth (FD, distance from water surface to fish). As a result of the relative height (RH, water depth-distance from bottom to fish ratio) analysis, there was a tendency that fishes are distributed in near surface area more as the WD increased. This tendency could have various reasons such as water temperature gradient along the water depth, and further studies are required for detailed explanation.

• 백승호(주식회사 에코리서치) | Seung-Ho Baek (EcoResearch incorporated, Gongju 32588, Republic of Korea)
• 박상현(주식회사 에코리서치) | Sang-Hyeon Park (EcoResearch incorporated, Gongju 32588, Republic of Korea)
• 송미영(국립수산과학원 중앙내수면연구소) | Mi-Young Song (1Inland Fisheries Research Institute, National Institute of Fisheries Science, Gapyeong 12453, Republic of Korea)
• 김정희(주식회사 에코리서치) | Jeong-Hui Kim (EcoResearch incorporated, Gongju 32588, Republic of Korea) Corresponding author