The Water Framework Directive (Classification, Priority Substances and Shellfish Waters) Regulations (Northern Ireland) 2015 No. 351

SCHEDULE 2

PART 1 Determining Ecological Status of Surface Waters that are not designated Heavily Modified or Artificial

2.  In this part, “high impact alien species” means a non-native species of plant or animal that has a detrimental effect on the aquatic ecology or environment.