Buffer fish

The Buffer fish would be a new mob like the sniffer having to be resurrected from extinction since they won't spawn naturally. The Buffer fish would be a new mob that can be found in an egg that rarely spawns in shipwreck chests, i believe the egg would be a transparent water greenish color with the fish visible from the outside, along with the egg being placed underwater and i think the Buffer fish would have a couple of unique abilities.

The Buffer fish would be a large puffer fish like mob with four stegosaurus plates alone its spine with a bit of a gap between the first and the second allowing you to put a saddle there, that would make the Buffer fish the first rid able aquatic mob. the Buffer fish would have four lower (pectoral) fins alone with a scaly orange body. when taming the mob you need to approach it slowly otherwise it will shoot out lots of little dart like barbs and you will get poisoned pretty bad. these the player should be able to collect them for a blow dart item where you can apply an effect to your darts, these darts could serve as early form of tipped arrows as the blowgun wouldn't be able to be enchanted where the bow would.