Non-indigenous species (NIS) are those species introduced outside their natural past or present range which might survive and reproduce. Some of the NIS can be harmless, with negligible impacts on native species. Other NIS can be invasive with potential to change native community composition and cause local population extinction with long lasting impacts which threaten biodiversity and ecosystem services. Those are addressed by the EU Regulation 1143/2014 on Invasive Alien Species which starts to include some marine species.