Density estimates of fishery resources in the Yedang Reservoir using hydroacoustics

Abstract

This study purpose to identify the spatiotemporal density distribution of dominant species of invasive fishes in the inland ecosystem of Yedang reservoir using scientific echosounder in June and September. In survey area (A) where fishing gear was installed, only daytime surveys were carried out, and in survey area (B) where fishing gears were not installed, it was conducted during the daytime and nighttime. As a result, fish schools were highly distributed in the eastern waters of the survey area in June, while they were highly distributed in the northwestern waters in September. In survey area during the daytime in June, they were highly distributed in the northern station 1 to 4 survey area; moreover, most fish schools were highly distributed at nighttime than during the daytime. Also, Results indicated that bluegill was the dominant species among other species collected using three-side fyke and gill nets. © 2025 The Korean Society of Fisheries and Aquatic Science.