Cottage Living random questions

I tried to search for a similar thread but I couldn't find any. I don't want to open a new one every time I have a question about something in Cottage Living.

My question is about ponds. I'm not sure I understand correctly how fishing from the pond works. I know I have to put the fishing sign in the pond, but then... does my Sim have to go fish somewhere else and then stock the pond with those fish and then she can fish the same ones back again? Does she then have to put the fish back to the pond again and repeat?
I don't understand what's the point of fishing from the pond then, other than get your fishing skill up by redoing the same thing over and over again. :|
It sounds boring, I'd rather go fishing somewhere else to get my Sims fishing skill up, at least she can get different fishes.