IDScientific NameCommon NameInvasive?HabitatsComments
13Urosalpinx cinereaAmerican oyster drill YPredator on oysters
5Eriocheir sinensisChinese mitten crabYStructuring component of high intertidal in upper estuaries
4Didemnum vexillumColonial tunicateYMay encrust submerged structures but may also affect sheltered shallow subtidal hard substrates
10Spartina anglicaCommon cord-grass, Townsend’s grass or ricegrassYMay dominate lower saltmarsh
17Codium fragile subsp tormentosoidesGreen sea fingersNMay dominate algal cover in infralittoral rocky reefs
12Undaria pinnatifidaJapanese kelpNMay dominate algal cover on rocky shores from low tide down to 15m
9Sargassum muticumJapanese weedYMay dominate algal cover on sheltered rocky and coarse substrate shores penetrating into estuaries
11 Styela clavaLeathery sea squirtY
6 Ficopomatus enigmaticusMarine tubewormY
14Mustela visonMink (added for black gulliemot feature only)N
2Crassostrea gigasPacific oyster YMay form oyster beds on coarse/hard substrates in estuariesRecently found growing outwith culture areas in the Solway, however any potential risks are associated with increasing temperatures that may allow natural spawning and subseqent impacts on natural flora and fauna. There is a commitment by the UKTAG group to consider C.gigas position on the UKTAG list using a recent review as background.
7Marenzelleria viridisPolychaeteNMay dominate faunal assemblage in low salinity shallow subtidal muds
8Perophora japonicaSea squirtNMay cover up to 10% of seabed surface in lagoons
3Crepidula fornicataSlipper limpetYMay smother subtidal muddy and sandy seabeds