Not that rare… it’s not hard to catch, you should kinda be able to tell depending on speed. It’s like a moderate speed. Really slow=turtle, impossibly fast=angelfish usually, or jellyfish, octopus is a little fast, moderate/moderate slow= clownfish, eel, herring. You could try saving before you fish and then if you don’t get the right one you can go back 😂 But usually the fish is more expensive then bait so I just get a ton and just sell every fish (unless it’s rare/needed)