Post Transition from Europe, the NI Protocol provides the following:
Regulation (EU) No. 1143/2014 applies to the United Kingdom in respect of Northern Ireland, i.e. With respect to Northern Ireland, the United Kingdom is to establish a surveillance system of invasive alien species of Union concern and notify the Commission and inform the Member States of the introduction or presence of invasive alien species of Union concern.
Article 19 of EU Regulation 1143/2014 requires Member States to produce effective management measures for each of the selected Widely Spread Species.
Within 18 months of an invasive alien species being included on the Union list, Member States (including Northern Ireland) shall have in place effective management measures for those invasive alien species of Union concern which the European Union have found to be widely spread on their territory, so that their impact on biodiversity, the related ecosystem services, and, where applicable, on human health or the economy are minimised.
The 11 classified Widely Spread Species in Northern Ireland and their associated management measures are listed here, they consist of 8 plants and 3 animals.