To find your game logs for Dovetail Games Fishing you will need to "Show Hidden Files" in windows.
To do this click - Windows Explorer > Local Disk (C:) > Organize > Folder and search options > View > double click Hidden files and folders > click Show hidden files, folders and drives > OK
You can then find the game logs by clicking - Windows Explorer > Local Disk(C:), then double click - Users > "your user name" > AppData > Local > FishingGame > Saved > Logs