The Dogon talk about Nommo - amphibian deities that arrived from the sky in their fantastic sky ship. They preached to the people who assembled in large numbers around the lake that was created around the ship.
Detail of a bas-relief from the palace of the Assyrian king Sargon II (721-705 BC) presumably showing “Oannes”. Louvre, Paris; origin: Dur-Sharken (modern Khorsabad), Irak.
Oannes. Emerging from the sea as half-man, half-fish, he gave humanity, reason, language, and purpose. Babylonian.
Annedots - people-amphibians from Sumer-Akkadian legends, the teachers of people outlived deluges
ancient fish people - Google Search
"Oannes, Babylonian god, 5000 BC" "Mermaid's Most Amazing by Narelle Oliver, Omnibus 2001" Hand-painted linocut and collage
Oannes as merman, from palace of Sargon II, Khorsabad
Fish God Oannes