According to one Greek myth , Pisces represents the fish, sometimes represented by koi fish , into which Aphrodite also considered Venus  and her son Eros also considered Cupid  transformed in order to escape the monster Typhon. It was then rolled to the shore by fish. Doves sat on the egg until it hatched, out from which came Aphrodite. As a sign of gratitude towards the fish, Aphrodite put the fish into the night sky.
Decan 1 Capricorn Horoscope December 12222
The Greek myth on the origin of the sign of Pisces has been cited by English astrologer Richard James Morrison as an example of the fables that arose from the original astrological doctrine, and that the "original intent of [it] was afterwards corrupted both by poets and priests. Purim , a Jewish holiday , falls at the full moon preceding the Passover, which was set by the full moon in Aries, which follows Pisces.
This parallels the entering into the Age of Pisces.