Alert list

This is a list of alien plant and animal species that have not yet been recorded in Swedish waters, but which are living close to our borders or are considered to be very invasive. It has been compiled from observations by Swedish and international marine scientists and is continuously updated as new information becomes available. An up-to-date version of the list is always posted on the site, which also features fact sheets on some of the species listed. The factsheets are published in Swedish and will gradually also be made available in English.

This website is a joint information channel for the three regional Information Offices along the Swedish coast: the Skagerrak/Kattegat area on the west coast of Sweden, the Baltic Sea proper, and the Gulf of Bothnia. The work of the Information Offices is commissioned by the Swedish Environmental Protection Agency and the Swedish Agency for Marine and Water Management. The website has been produced in close collaboration with the Swedish AquAliens programme, which ended in January 2008.

Parasitic protozoans

Bonamia ostreae V

Microalgae

Dinoflagellates

Alexandrium leei V

Alexandrium margalefi V

Dinophysis sacculus V !

Pfiesteria piscicida V ! 1

Silicoflagellates

Pseudochattonella veruculosa V !

Macroalgae

Brown algae

Undaria pinnatifida (Wakame, Japanese kelp, Asian kelp) V !

Red algae

Antithamnion nipponicum V

Antithamnionella spirographidis V

Antithamnionella ternifolia V

Polysiphonia senticulosa V

GREEN ALGAE

Ulva australis V 2

Invertebrates

Cnidarians

Bougainvillia rugosa V

Diadumene lineata (orange-striped sea anemone) V 3

Maeotias marginata (Black Sea jellyfish) Ö

Nemopsis bachei V

Thorny-headed worms

Paratenuisentis ambiguus Ö

Annelid worms

Polychaetes

Bispira polyomna n. sp. V

Boccardia redeki Ö 4

Boccardia proboscidea  V

Ficopomatus enigmaticus (Australian tubeworm) V !

Hypania invalida ÖL

Marphysa sanguinea V 5

Neodexiospira brasiliensis V

Polydora hoplura V

Oligochaetes

Branchiura sowerbyi ÖL 6

Potamothrix moldaviensis ÖL 7

Tuboficoides heterochaetus V

Arthropods

Water fleas

Cornigerius maeoticus Ö

Barnacles

Amphibalanus amphitrite (striped barnacle) V

Amphibalanus reticulatus V

Amphibalanus variegatus V

Austronominius modestus (Australian barnacle, small barnacle) V 8

Balanus trigonus V

Megabalanus coccopoma (titan acorn barnacle) V

Megabalanus tintinnabulum V

Copepods

Acartia (Acartiura) omorii V

Ameira divagans Ö

Eurytemora americana V

Mytilicola intestinalis V

Pseudodiaptomus marinus V

Malacostraca
Mysids

Limnomysis benedeni ÖL

Paramysis intermedia Ö

Paramysis lacustris ÖL

Amphipods

Chelicorophium curvispinum(Caspian mud shrimp) ÖL, V 9

Dikerogammarus haemobaphes ÖL

Dikerogammarus villosus (killer shrimp) ÖL !

Echinogammarus ischnus ÖL

Echinogammarus warpachowskyi ÖL

Gmelinoides fasciatus Ö

Incisocalliope aestuarius V

Melita nitida Ö

Monocorophium sextonae V 10

Obessogammarus crassus ÖL

Orchestia cavimana (sand hopper) Ö

Pontogammarus robustoides ÖL !

Isopds

Synidotea laticauda V 11

Tanaids

Sinelobus stanfordi VE

Cumaceans

Pseudocuma (Stenocuma) graciloides Ö

Decapods (crabs, lobsters and shrimps)

Callinectes sapidus (blue crab) V

Hemigrapsus sanguineus (Asian shore crab, Japanese shore crab) V !

Hemigrapsus takanoi (brush-clawed shore crab) V

Orconectes limosus (spiny-cheek crayfish) ÖL

Palaemon elegans Ö 12

Palaemon macrodactylus (oriental shrimp) V

Paralithodes camtschaticus (red king crab) !

Rhithropanopeus harrisii (white-fingered mud crab, Harris mud crab, Zuiderzee crab, estuarine mud crab, dwarf crab) Ö, V !

Molluscs

Bivales

Corbicula fluminea (Asian clam, prosperity clam) VE !

Dreissena bugensis (quagga mussel) Ö !

Mercenaria mercenaria (northern quahog, hard clam, cherrystone-) V

Rangia cuneata (common rangia, Atlantic rangia) V !

Ruditapes philippinarum (Japanese carpet shell, Manila clam) V

Snails

Lithoglyphus naticoides (gravel snail) ÖL

Ocinebrellus inornatus (Japanese oyster drill) V ! 13

Rapana venosa (veined rapa whelk, Asian rapa whelk, rapa whelk) V !

Urosalpinx cinerea (American oyster drill) V !

Bryozoans

Bugula simplex V

Bugula stolonifera V

Fenestrulina delicia V

Tricellaria inopinata V !

Watersipora subtorquata V !

Urochordata

Ascidians

Botrylloides violaceus (orange sheath tunicate) V

Corella eumyota V

Didemnum vexillum (Whangamata sea squirt) V

Styela clava (leathery sea squirt, rough sea squirt, Asian tunicate, club tunicate) V !

Vertebrates

Craniata

Bony fishes

Gobiosoma bosc V

Carassius gibelio (Prussian carp, giebel, golden carp) Ö 14

Hypophthalmichthys nobilis (bighead carp) Ö, V

Lepomis gibbosus (pumpkinseed, pumpkinseed sunfish) ÖL !

Micropogonias undulatus (Atlantic croaker) V

Neogobius fluviatilis (monkey goby) ÖL

Neogobius gymnotrachelus (racer goby) ÖL

Perccottus glenii (Chinese sleeper, Amur sleeper) ÖL 

Proterorhinus semilunaris (western tubenose goby) ÖL 15

 


Key:

V The species has been recorded in the North Sea area close to the Swedish part of the Skagerrak/Kattegat area (Västerhavet).

VE The species has been recorded in the North Sea area but limited to freshwater and estuaries.

Ö The species has been recorded on the other side of the Baltic Sea.

ÖL The species has been recorded on the other side of the Baltic Sea, but has a limited distribution in lagoons and freshwater influenced estuaries.

! The species is according to international species lists (NOBANIS, DAISIE, GISD, IOC) considered to be very invasive. It does not necessarily mean that the species will be invasive in Swedish waters

 


  1. One of the most feared species internationally. Not yet observed in Swedish areas, but considerable risk of introduction (ballast water discharge, or currents).
  2. Also known as Ulva pertusa
  3. Also known as Haliplanella lineata
  4. Also known as Polydora redeki
  5. Can be a cryptic cosmopolite
  6. Occurs in Lake Mälaren
  7. Occurs in Lake Mälaren, Lake Roxen and Lake Algunnen
  8. Also known as Elminius modestus
  9. Also known as Corophium curvispinum
  10. Also known as Corophium sextonae
  11. Earlier misidentified as Synidotea laevidorsalis
  12. Probably a genetic variant from the Mediterranean-Black Sea introduced by man
  13. Also known as Ceratostoma inornatum
  14. Found in freshwater on Gotland and in the County of Kalmar
  15. Earlier called P. marmoratus which is considered a marine species

 

 

This list is also available as a PDF file.