A Fishing System for Smile Game Builder, can probably be used in Bakin also or edited to work in Bakin. It is a system near perfect to the fishing in Fantasy Life on the 3DS.
It was a custom creation order I payed for to use in my own game.. unfortunately I can't use it now so I am going to make it available to people at my itch.io page here: https://sdassets.itch.io/
NOTE: You DO NOT have permission to use the graphics within this demo, you'll have to create your own if the game is for commercial use, personal use is fine though. The graphics are placeholders to showcase the fishing itself.