Oannes- The Fish-Man

The Repulsive or Repellent Ones, a demon, the fish-men who the Babylonians said brought them civilization. The first and most famous was called Oannes or Oe, who was thought to have come from a 'great egg'. This one during the day stayed on the surface among people, but for all the night he had to go into the sea. He, with other similar beings called Annedotus, is the creator of the Babylonian civilization (Berosso). Later Oannes will become the Fish-God for the Philistines.

The following descriptions are taken from a history of Mesopotamia written in the third century BC by Berossus, a Babylonian priest whose work survives only in fragments recorded by later Greek historians."
- Mysteries of the Unexplained (from Robert Temple, Sirius Mystery)

"At Babylon there was (in these times) a great resort of people of various nations, who inhabited Chaldaea, and lived in a lawless manner like the beasts of the field. In the first year there appeared, from that part of the Erythraean sea which borders upon Babylonia, an animal destitute of reason [sic], by name Oannes, whose whole body (according to the account of Apollodorus) was that of a fish, that under the fish's head he had another head, with feet also below, similar to those of a man, subjoined to the fish's tail. His voice too, and language, was articulated and human, and a representation of him is preserved even to this day.
"This Being was accustomed to pass the day among men; but took no food at that season; and he gave them an insight into letters and sciences, and arts of every kind. He taught them to construct cities, to found temples, to compile laws, and explained to them the principles of geometrical knowledge. He made them distinguish the seeds of the earth, and shewed them how to collect the fruits; in short, he instructed them in everything which could tend to soften manners and humanize their lives. From that time, nothing material has been added by way of improvement to his instructions. And when the sun had set, this Being Oannes, retired again into the sea, and passed the night in the deep; for he was amphibious. After this there appeared other animals like Oannes."
- Berossus, from Ancient Fragments (Isaac Preston Cory)

"Oannes is the emblem of priestly, esoteric wisdom; he comes out from the sea, because the 'great deep', the water, typifies...the secret doctrine."
- M. P. Blavatsky, Isis Unveiled