It's like riding a bike, but I've never gone without fishing for so long to forget how to fish.

[Teasing mildly, agreeing that yeah it's fair to say there was no lake initially in the first place, Noctis finishes getting his bait ready and moves to stand up, making a nice easy cast out fairly far. He hears the plunk in the water, he feels nothing in the way when he reels a moment, so he moves to sit back down then with a contented exhale.]

At least you will have plenty of time to get used to it again.