Sargassum occurs. "Sargassum muticum" is a large brown seaweed of the class Phaeophyceae. It grows attached to rocks by a perennial holdfast up to 5 cm in diameter. From this holdfast the main axis grows to a maximum of 5 cm high. The leaf-like laminae and primary lateral branches grow from this stipe. In warm waters, it can grow to 12 m long, however in British waters it gives rise to a single main axis with secondary and tertiary branches that the plant sheds annually. Numerous small 2–6 mm stalked air vesicles provide buoyancy. The reproductive receptacles are also stalked, and
Sargassum muticum around the farming structures, requiring additional maintenance. It also gets entangled with the propellers of the boats. Mechanical removal—however this promotes dissemination of the species and the technique is labor-intensive. Chemical—the use of herbicides is advised against, because it poses a major risk to the environment and others organisms. Biological—there are few natural predators, one example is a little copepod that will eat only the unhealthy and damaged parts of "S. muticum." Currently the distribution is stabilized, and only mechanical removal is performed. There are some potential uses for "Sargassum muticum." In agriculture, algae are used as sources of nitrate