![Bull kelp or rimurapa (Durvillaea species)](http://static.sciencelearn.org.nz/images/images/000/004/780/full/ART_P%C5%8Dh%C4%81_BullKelp.jpg?1674175758)
Rimurapa is a robust seaweed that grows in exposed coastal areas. The blades float on the surface of the water due to their air-filled, honeycomb structure. For centuries, Māori have used rimurapa for storage, to steam shellfish and even to surf the waves!