Fuente: WIPO "essential oil or extracts" An anti-fouling composition for application to a substrate intended for use in an aquatic environment, the composition including a biocide and a binder arranged, in use, to release the biocide from the composition over a period of time, wherein the biocide is selected from tea tree oil, lemon scented tea tree oil, cloned tea tree oil, lemon myrtle oil, eucalyptus oil, components/extracts thereof, and mixtures thereof.