Bump / Update #1

I figured that the fish may literally be hidden, and the translation/instructions were just poorly thought out. Went to every fishing spot in sea of clouds during umbral wind and tried using fish eyes.
No luck whatsoever

I realize that fish may be weather dependent / timed, but without any way to confirm the book was actually read, I don't want to spend 3 days fishing for something that I can't get, or for something that isn't actually in the game yet

Does anyone have any ideas at all about this?