seaweed

A picture taken on August 20, 2014 shows a Moroccan man carrying a bag of red seaweed, known locally "red gold", on the beach in El Jadida roughly 100 kilometres (60 miles) southwest of Casablanca, after boats came back from fishing. Harvesting this mineral-rich seaweed on Morocco's Atlantic coast is becoming increasingly scarce due to an increased number of fishermen and depleting amounts of the seaweed in the sea. AFP PHOTO / FADEL SENNA

Fadel Senna/AFP

A Moroccan worker carries a bag of red seaweed, known locally ‘red gold’, on the beach in El Jadida, roughly 100km southwest of Casablanca. Harvesting this mineral-rich seaweed is becoming increasingly difficult due to increased fishing and seaweed depletion

A swimmer walks on a beach covered in seaweed in the coastal city of Qingdao, eastern China's Shandong province, 17 June 2013. The seaweed, named enteromorpha prolifera grow quickly due to marine water eutrophication and warm weather following the ocean current that gather at the coastlines of Qingdao and the neighboring cities in recent days. This causes oxygen deficiency for the marine aquaculture and bad effects for the tourism.

Wu Hong/EPA

A swimmer walks on a beach covered in seaweed in the coastal city of Qingdao, Shandong province in eastern China.