Grateloupia turuturu, is a marine species of a red algae (Rhodophyta), also known as Devil’s tongue weed because of its shape and color. It is native to East Asia and some parts of Eastern Russia, and due to marine activity, it has become an invasive species. Grateloupia is considered harmful because it competes with native marine algae and affects its distribution resulting in habitat loss. To add to this problem Grateloupia can also withstand many environmental changes making it more and more threatening for other species.

It can live up to 10 years and grow to be almost a meter long, they grow best in eutrophic waters and are commonly found near coastal shores, attached to rocks, shells and even artificial surfaces.

This seaweed can reproduce sexually and asexually when each blade produces thousands of spores that can grow into new blades.

Grateloupia turuturu is traditionally used as food and a source of carrageenan-agar polymers.

This specimen is considered quite young due to its size.