i dont really know about your mos creatures, but i dont think you can really tame a shark... their nature is such that it would probably be difficult. however, if you flip a shark over onto its back they become quite docile.
No, mystics can not tame creatures like venomancers. Although, when you level you get a skill which guves you pets. You can't tame the actual creatures, or pick what they look like. But they help you in battle.
Sharks
No, sharks are aquatic creatures and cannot survive out of water.
Creatures who have ?? as their level are too high level for you to tame - you can only tame creatures of your level or lower. Also, sometimes the ?? means that the creature is a Boss - these can never be tamed. You can use your Beast Lore ability as a hunter to check on any creature whether it can be tamed or not.
sharks
they stop smaller creatures from overproducing.
All creatures have adaptations.
sharks
Sharks
You can only tame wolvesand cats in original Minecraft by giving them a bone from skeletons and right clicking them, they can have any number of bones. But, if you get a mod you could tame Chickens, Cows, or maybe pigs and that. Its best to check out the Minecraft Wiki. Even other mods like Mo' creatures, adds creatures and lets you tame them, like horses, cats, goats, big-cats and such.
Octopuses, hermit crabs, squid, slugs, snails, and sharks are a few creatures that do not have bones (creatures that do not have bones are called 'invertebrates').
there are felxible, but not the most flexible creatures in the Sea.