How would you see magic working on the sea?

Seeing as magic is what makes fantasy worlds come alive, how would you see it in a part of the world like the ocean? What magic would more marine animals have? How would magic interact with water itself? What would be the culture like for underwater societies that use magic? What kind of magic do you think should exist on the ocean?<br><br><br>I'll be taking from this post in my own world project that takes place on a sea planet. In fact, this universe will have magic. I'll be using everything you mention here, so I appreciate your help!