Tamable using fish baskets from aberration. They attack the baskets once placed. It is a good strategy to pen then in with fence foundations and walls, or kite them to a pen. Place your basket on the other side of the wall and catch.
A piranha is tameable in Abberation using the fish trap. It has to swim into it. Once you release it from the fish trap, it will be tamed. Great tame in packs, they can kill a good amount of low to mid level groups of players.
These things will spawn in your water pen and kill your tames if they're on passive. Make sure you have Dino's to kill them or foundations all around your pen, they've killed so many of my Icthyosaurus' it's not even funny.
Can be tamed in abberation however you have to force feed it in it's inventory it will not feed itself.not worth taming. To tame. Jump in the water and get them to beach themselves. Kill the ones you don't want. Place fish basket wait near fish. Wait till it initializes. If the fish leaves range kite it back and start over. Then pick up trap you have five min to get them to what ever body of water you want them in. Remember you must force feed them like a baby after hatching/birth. For the entirety of their life.