Seaweed

Seaweed is a world object in Fallout 4 and Fallout 76. It is also mentioned as a consumable in Fallout 2.

Characteristics
A dark greenish water plant. When it decomposes, it leaves a terrible smell. The Shi in post-war San Francisco eat it alongside fish. Seaweed occasionally also grows on the shells of mirelurks.

Locations
Frequently found in bodies of water, such as oceans, lakes, and rivers, in the former American Southwest, the Commonwealth, and Appalachia.

Appearances
Seaweed appears in Fallout 4 and Fallout 76, and is mentioned in Fallout 2.