So, it seems that Koda automatically fishes where you have unlocked and once it gets to 50 (last area) you get a bunch of things you can only use in complex recipes which take a while to cook up. I like to select a ton of tuna, greyling, salmon, or whatnot and come back to get them in a few minutes, not wait for longer for only a few dishes to be made. So I think we should be able to select where Koda passively fishes for us, just to make this easier, especially if you don't have the right levels in cooking or have the recipes unlocked.