Warning: it does not require cc nor mod, just cheat codes.
1- Create a swimming pool. 2 - On the text box (press ctrl+shift+c) you have to type bb.moveobjects on and press enter. 3 -Then type bb.showhiddenobjects and press enter. 4 - Now on the search box of the inventory type ‘debug’. It will show a long list of hidden objects. 5 - Look for the fishing signals and buy at least one of those (note they are a lot but you have to get those on which pop ups a description when you select the icons, NOT those on which it says only 'debug § 0’. 6 - Finally, put the fishing signal close at the poolside. Note 1 - You can decorate around the pool with plants and rocks, and you can even hide the fishing signal so that everything seems more natural, but don’t put so much decorations where there’s the green grid of the fishing signal. This is the fishing area which must be walkable for your fisher-sims. Note 2 - This procedure works even with a fountain.
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Please don’t claim this tutorial as your own
Tag ‘lovenovavita’ so I can see how it works in your game.