I'm trying to remember the name of a fishing game

So when I was a kid there was this fishing game a played a ton of on my DS. It was in a relatively cartoony square lake and the fish were just shadows in the lake and it was relatively involved with the fishing minigame stuff. It was sort of structured like an incremental game where you earned money for each fish and just upgraded your fishing gear. As far as I can remember this fishing was literally the only thing in the game.

I got it on the eshop and I think it never had a physical release. If anyone has any ideas about what this game could be I would super duper appreciate it. Thanks :)