Why would you want to keep a fish? The rares are meant to go towards achievements anyway it doesn't matter. They are useless anyway, just wasted bank space. People... Stop complaining about irrelevant things please.
You're all wrong LOL green fish and above aren't saved in your inventory they only count towards the achievements. They don't disappear because they were never meant to be looted, it has been confirmed already by mods.
Well thank for telling us, now I know that the fishing game is plain not worth the time, nor worth the space in my inventory for bait. Never heard of a game mechanic that didn't tie into the actual adventure. Minigames are supposed to reward, not just count how many fish you've caught but can't use them for anything