A woman harvesting seaweed at one of the underwater farms, Paje, Zanzibar, Tanzania, East Africa, Africa

David Keanes, owner of Connemara Oyster Farm with oyster-bags, Ballinakill Bay, Letterfrack, Connemara, County Galway, Connacht, Republic of Ireland

Seaweed farms in the sea at low tide, Paje, Zanzibar, Tanzania, East Africa, Africa

A young girl walking through the seaweed farms in the sea, Paje, Zanzibar, Tanzania, East Africa, AFrica

Seaweed farms in the sea at low tide, Paje, Zanzibar, Tanzania, East Africa, Africa

Beds of seaweed, an export crop, Jambiani Beach, Zanzibar, Tanzania, East Africa, Africa

Seaweed farmer, Zanzibar Island, Tanzania, East Africa, Africa

Seaweed farmer, Zanzibar Island, Tanzania, East Africa, Africa

Seaweed farming, Rebun Island, Hokkaido, Japan, Asia

Seaweed farmer, Rebun Island, Hokkaido, Japan, Asia

Carrageenan Seaweed Harvesting, Bukit Peninsula, Bali, Indonesia

Woman wearing straw hat farming seaweed from a small wooden boat, Vietnam

Woman wearing straw hat farming seaweed from a small wooden boat, Vietnam