Sources : Babylonian Fish

Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Fish 7.18): The Babylonian fish (Babilonici pisces), which Theophrastus describes as being a wonder around Babylon; that is, in places where rivers fall into caves that have water. From these places or caves, monstrous fish come out to feed with frequent movements of their fins and their tails. They have heads like those of a marine frog, and the rest of their bodies are like cabiones [?]. Their gills are like those of other fishes. - [Badke translation/paraphrase]