The value of regular monitoring and diverse sampling techniques to assess aquatic non-native species: a case study from Orkney Author Kakkonen, Jenni E. * & Marine Services, Harbour Authority Building, Scapa, Orkney, KW 15 1 SD, United Kingdom Author Worsfold, Tim M. APEM Ltd., Diamond Centre, Works Road, Letchworth Garden City, SG 6 1 LW, United Kingdom Author Ashelby, Christopher W. APEM Ltd., Diamond Centre, Works Road, Letchworth Garden City, SG 6 1 LW, United Kingdom Author Taylor, Andrea * & Marine Services, Harbour Authority Building, Scapa, Orkney, KW 15 1 SD, United Kingdom Author Beaton, Katy * & Marine Services, Harbour Authority Building, Scapa, Orkney, KW 15 1 SD, United Kingdom text Management of Biological Invasions 2019 2018-10-17 10 1 46 79 http://dx.doi.org/10.3391/mbi.2019.10.1.04 journal article 299406 10.3391/mbi.2019.10.1.04 a53d05d0-2083-4f05-a83c-8f418fdc5468 1989-8649 11969078 (13) Schizoporella japonica Ortmann, 1890 Status in U.K. – non-native. Schizoporella japonica was first reported in British waters from Holyhead in July 2010 ( Ryland et al. 2014 ) but Loxton et al. (2017) found an archived sample from Plymouth that backdated the introduction to at least November 2009 . It has a near continuous distribution in Scotland ( Loxton et al. 2017 ) and has been present in Orkney since at least May 2011 ( Ryland et al. 2014 ) where it is also found on human-made structures ( Want et al. 2017 ). It has been recorded in scrape and rapid assessment samples from several monitoring programme sites each year since 2014.