Fucus vesiculosus, known by the common names bladder wrack, black tang, rockweed, bladder fucus, sea oak, cut weed, dyers fucus, red fucus and rock wrack, is a seaweed found on the coasts of the North Sea, the western Baltic Sea and the Atlantic and Pacific Oceans.

What is the meaning of rockweed?

: any of various coarse brown algae (order Fucales, especially genera Fucus, Ascophyllum, and Sargassum) growing in marine environments free-floating or attached to rocks.

What is rockweed used for?

Rockweed is used as a stabilizer in food and cosmetics. Indirectly, rockweeds support recreational and commercial fisheries by providing shelter for lobsters, foraging for juvenile fish, and food for herbivores, the prey of fish, waterfowl, and crustaceans.