Using Mobile-Based Hydroacoustic Sonar to Survey Bathymetry, Bottom Substrate and Submerged Vegetation Features in Eastern South Dakota Glacial Lakes

Hydroacoustic technologies have become a common assessment tool for fisheries managers to measure both physical habitat features and sport fish population characteristics. Evaluating habitat data collected with hydroacoustic sonar, in combination with fisheries data collected through standardized sampling, we can identify spatial attributes of a lake that may affect population dynamics and quality of the fishery. Further, visualization of hydroacoustic data allows for habitat improvements and restoration planning. This study was designed to collect hydroacoustic data on 24 Eastern South Dakota glacial lakes and impoundments for future comparisons with fisheries data collected using standardized sampling techniques. Hydroacoustic data was collected using a BioSonics DT-X Digital Echosounder System in conjunction with BioSonics VBT (Visual Bottom Typer) software to classify bottom substrate and BioSonics EcoSAV software to determine presence of submerged aquatic vegetation. Post-processed data generated for ESRI ArcGIS 10 results in spatial variables for comparison with a fish community database to identify physical attributes that link to fisheries population characteristics. The results of this study should assist managers in making strategic decisions regarding in-lake habitat improvement projects along with watershed improvement and lake restoration planning.