The Earth's marine ecosystems boast a diverse array of living creatures, each one a miracle of YHWH's creation.
One such creature is the Aqua Ape, a species unique to Fear Lake. The enchanted water transforms the once-peaceful miniature apes into giant menaces to society who wreck houses and raid cookie jars. Truly, a powerful warning about the danger that magic lakes pose to our civilization.
Another such creature is the sea turtle, which spends its time swimming, eating stuff, and peeing / pooping in the ocean. When it has to go, it just lets a rip, y'know? It doesn't give a damn. And why should it? It's part of nature and stuff.
A third marine creature is (or rather, was) the narwhal, which we actually hunted to extinction about 40 years ago. Our government was too embarrassed to admit that, so they just started painting belugas grey and strapping jousting lances to their faces. Some of these lances are historical artifacts, and one faux-Narwhal, Bernard, wears a lance-tusk that was once used in practice by the legendary Sir Lancelot, after whom the lance itself is named.