This indicator tracks the number of invasive non-native species (INNS) present in Jersey that exert a negative impact on native land and freshwater biodiversity. There are six freshwater species and 35 land species, including Japanese Knotweed, Pampas Grass and Asian Hornets.

Invasive species are cited by the Convention on Biological Diversity as the second largest cause of global biodiversity loss (the first being habitat loss). The impacts of INNS are many and varied, but include losses to habitats, environmental damage and degradation and control costs (estimates of the annual global costs associated with the problem exceed hundreds of billions of dollars). Non-native species are those that have reached Jersey by accidental human transport, deliberate human introduction, or which arrived by natural dispersal from a non-native population in the rest of the British Isles or Europe. Most are considered non-threatening, but some have a very negative impact on native species and ecosystems through the spread of disease or by direct competition; such species are termed invasive.