Source of food
Chlorella, Laminaria, Spirullina, Sargassum and Porphyra
Source of chemicals
Gelidium and Gracilaria produce agar. Brown algae produce algin and red algae produce carrageen chemicals.
Source of fodder
Kelps (brown algae), Laminaria etc.
Source of medicines
Ascophyllum, Fucus, Digenea, Codium, Durvillea, Codium, Laminaria