MOBILE: Tested in single-player that actually some tamed Ichthy aggro nothing in the ocean while some attract sea creatures from afar. Reasons are not yet confirmed, but it's likely that those Ichthy with higher raw level or better status don't aggro.
Not true. Icthys on mobile still are not attacked by anything in the ocean(unless u attack it). I tested it while taming a lv 80 mosa. Swam right next to it before I attacked. I still think icthys are the best underwater tame. Their fast, they have rider weaponry, and r perfect for taming plesiosaurs and mosas. Tamed easily, as they swim right up to u. They eat dodo kibble, and if u have 3-5 kibble, u can easily get one fast. (-like if this helps😁)