Dictionary of Ichthyology

Dagon = the fish god of the Philistines, the
upper half being a man and the lower half
a fish. The fish half represented fertility.
The name is from the word dag, meaning
fish. The Babylonians had a myth of a
being who emerged from the Erythraean Sea, being part fish and part man. Also found in Assyrian sculpture.

From Whymper's "The Fisheries of the
World", 1883. Photograph by Brian W. Coad.