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 (2) Asparagopsis armata Harvey, 1855 Status in U.K. – non-native. There have been two records of Asparagopsis armata (“harpoon weed”) from the monitoring programme, from buoys at Holm and Shapinsay, both from 2013. The species is believed to have been introduced to Europe from southern Australia or New Zealand in the 1920s ( Ní Chualáin et al. 2004 ) and has otherwise been recorded in Orkney at Kirkwall and Skatelan Skerry by Wilkinson (1975) and Maggs and Stegenga (1999) .