One day, King Manu was collecting water from a river when a
small fish swam into his vessel. As he tried to throw it back, the small
fish begged him to save it from the big fish. The king took pity on the
fish had grown big so Manu kept it in a tank.
Day after day, the fish kept growing in size and finally it was so big
that it had to be taken to the ocean. As Manu was putting the fish in the
ocean, the fish told him, "I am Matsya, the avatar of Vishnu. In a
few days, a big flood will submerge the whole earth. You must build a
big ship and fill it with good people and animals and plants of all kind."
As the fish had predicted, it rained continuously for seven days and
seven nights and all the creatures drowned in the flood except those who
were of Manu's ship. Manu created a new kingdom on earth with the
creatures who had survived.