Just an FYI - We discuss in pretty good detail about trout and salmon fishing here because they are a roaming fish and aren't particularly vulnerable like schooloing fish like walleyes, perch, crappies etc.. Tributary fishing the issue is similar and the often mentioned term is "spot burning" and it can be a legitimate concern. Usually the personal messaging (PM) componnent here is used to relay any desired information to fishing friends on here that you don't wish to go public where there is a high risk of unwanted attention to your post information.