I removed fish from a whole lake, but their map tags remain.

Thanks for letting me know! In my saves, it works but I found a case where there would be an issue. Did you add this mod to a new save, remove the mod, then add it again? If so, this may happen. I'm working on a fix.

Hi! Sorry for not responding for over two weeks. I don't remember details, but I must have loaded the game with the mod, the fish did not disappear for at least 15 minutes maybe more, and then I tried removing and re-adding the mod in different saves. Later I found out fish tags are in fact updated, but after a long period.

It would be cool to have a setting for how often they update. You could lower and rise it if needed, or can manually force update pin update after you clear a lake of them. Or at least info on mod page how often will it update pins.

That being said, this mod could be more popular, it's a fun idea.