Mythical fish

These fish would be extremely rare and difficult to catch, but be very large or decorative, about 6-10 blocks long.

These would function as aquarium centrepieces for decorative players or can hold large amounts of value due to their scarcity.

They would probably be about 1/10th rarer than epic fish and may have catch conditions (rain, caught in specific biome, etc), or could have a chance to be caught using obtainable bait in certain chests (like buried treasure or shipwrecks).