Nowruz is one of the most beautiful and lasting Iranian rituals that Iranians around the world celebrate this annual ritual. Every year, Iranians put red fish on their Haft Sin table, which is a symbol of birth and freshness. This red fish is at the end of the 13th day of April, which is the last day of Nowruz, which is called the day of nature. They are released in the river or ponds.