Non-indigenous species introduction records in UK waters 2003 to 2020

Data are the years and locations of first occurrence of marine non-indigenous species (NIS) in UK waters in the two OSPAR regions (Greater North Sea, Celtic Seas), of species that have arrived in the assessment period 2003-2020 inclusive. These data are subject to analysis under the UK Marine Strategy Indicator Assessment 2024 'the number of new non-indigenous species introductions'.