Animal Crossing: New Horizons is a charming game filled with plenty of silly lines of dialogue, and one that you’re going to hear a lot is about a sea bass:
“I caught a sea bass! No, wait–it’s at least a C+!”
It’s an amusing pun that helps to take the sting away from catching such a common fish, but then you’ll read it a few more times and it will lose its charm. When you’re desperate to catch something better, the line becomes something of a taunt, and even the Nintendo employee who wrote it doesn’t want to read it anymore.
Source: Gamespot Even The Writer Behind That Animal Crossing Sea Bass Joke Is Sick Of It