The outer layer of sushi is made of seaweed.

Porphyra (Pyropia/Porphyraspp.) belongs to Rhodophyta, Protoflorideae, Bangiales, and Bangiaceae in systematic taxonomy. It is a type of plant that grows in

The distribution range of intertidal seaweed covers cold zone, temperate zone, subtropical and tropical seas.

In addition, there have been many reports about it in recent years.

Porphyra is the most valuable cultivated seaweed in the world and is cultivated on a large scale in China, Japan and South Korea.

Sushi is a traditional Japanese delicacy. In ancient Japan, sushi was salted fish marinated in salt and rice. It later evolved into today's sushi.

"Sushi" was written as "鮨" (すし) in ancient Japan, and its original meaning was "salted fish".

The name "Sushi" is the Man'yōkana version of the character "鮨".