What god or goddess belongs to Pisces?

Answer 1

The Ichthyes (Fishes) were a pair of large Syrian river fish who rescued Aphrodite and Eros when they were fleeing from the monster Typhoeus. Others say the two gods disguised themselves as fish to escape the monster, or that the fish assisted in the birth of Aphrodite. In all versions of the story, they were placed amongst the stars as the Constellation Pisces.

These Fishes probably developed into Aphros and Bythos, the fish-tailed Ikhthyokentauroi (Sea-Centaurs) of late classical art, which are shown bringing Aphrodite ashore following her sea-birth.