Leonel Pereira 
Edible Seaweeds of the World [PDF ebook] 

Seaweed is used in many countries for very different purposes – directly as food, especially in sushi, as a source of phycocolloids, extraction of compounds with antiviral, antibacterial or antitumor activity and as biofertilizers. About four million tons of seaweed are harvested annually worldwide. Of the various species known, less than 20 accoun