Annedotus

Annedotus a Chaldeaan fish-deity, a form of Hea, said to have had the body of a fish entire, but underneath his fish's head to have had a human head, while human feet appeared under his tail. This monster was said to spend the whole day among men without taking any food, teaching them letters, science, and the principles of every art, the rules for the foundation of towns, the building of temples, the measurement and boundaries of lands, seed-time and harvest — all that could advance civilization; and then at sunset he returned to the sea, and passed the night in the vast region of waves, for he was amphibious. See Lenormant, Chaldaean Magic, p. 157.