I dont know why alot of people are saying other water dinos dont attack this dino this is false everything shy of turtles and small fish attack you so always be aware of your surroundings. Also this dino is the fastest water dino so lvl stam and speed. Side note you will not win a fight against anything on this dino it is for traveling in water only. Stay away from all water dinos.
Well if you are on mobile and dinos of lvl. 30 rarely roam the island, just cook a Dodo Kibble (You get a pursuit named 'Fresh Breakfast') Just put a Dodo egg, some rokcarrots(You can mostly find them on small hills to big mountains, and to be specific, in jungle ferns and to be even more specific, they thrive near mammals). Then craft a cooking pot and put filled water skins, then add some mejoberries and some fiber. Also add cooked meat. Then light the fire. You get your Kibble. Go near that dolphin and feed it. It will get tamed in one or two kibbles (if it's under lvl.30)
These guys are good for underwater adventures. They like invisible to underwater dinos even tuso mosa. The letdown about them is they're so fast to get hungry when sprinting. Make sure you got plenty stack of meat in its inventory.
Listen I thought these guys were useless, but me and another player tame a couple out of boredom and WOW THEY ARE AWESOME. A level 30 and 126 killed a 135 alpha meg! Do not ignore these guys when they swarm you.