The weed can't be cut down because it fragments, and each piece can regenerate into a new plant. Divers will either remove plants by hand or use chlorine to try and poison plant beds. Spreads vegetatively, through fragmentation. Can survive up to ten days out of the water. Spread in Mediterranean by fishing nets and boat anchors.
Divers place a heavy plastic tarp over the seaweed patch.
The tarp is sealed along all the edges and the top is fitted with a vent, to allow release of gas produced during photosynthesis. The chlorine poisons the seaweed under the tarp.