Pisces

Pisces is the constellation of the Zodiac that is represented as Two Fish.

The Age of Pisces seems to have started about the same time as the supposed Birth of Jesus Christ which probably led to the adoption of the symbol of the fish to represent Christianity.  This symbol is still today found on many bumper stickers in areas that have a large number of Christians. 

Jesus Christ is said to have fed 5000 people with 5 loaves of bread and Two Fish.