In this fish inventory conducted on behalf of the County Administrative Board of Stockholm, 20 eDNA samples were collected from Lake Mälaren. The purpose was to examine the overall fish community with a specific focus on the round goby. The results were further compared with historical fishing data. The study demonstrates that eDNA can advantageously be used to describe fish composition in a water body, as the method typically detects more species than traditional sampling. No round goby was detected, but the study can serve as an initial step in a monitoring program to track the species’ distribution in the county.
