Photo | Taxonomic Group | Family | Scientific Name (click for species profile) | Common Name | Continent of Origin | Year First Collected | Category |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002150604.jpg&height=100) | Algae | Hemidiscaceae | Actinocyclus normanii f. subsalsa | A centric diatom | Europe | 1709 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2015/20150917104252.jpg&height=100) | Algae | Bangiaceae | Bangia atropurpurea | A red alga | Europe | 1944 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120619094733.JPG&height=100) | Algae | Chaetocerotaceae | Chaetoceros muelleri | A centric diatom | Unknown | 1978 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002150844.jpeg&height=100) | Algae | Stylonemataceae | Chroodactylon ornatum | A red alga | North America | 1964 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2009/20090612112738.gif&height=100) | Algae | Thalassiosiraceae | Conticribra guillardii | A centric diatom | Europe | 1973 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107113401.jpg&height=100) | Algae | Stephanodiscaceae | Cyclotella atomus | A centric diatom | Unknown | 1964 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107113545.jpg&height=100) | Algae | Stephanodiscaceae | Cyclotella cryptica | A centric diatom | Unknown | 1964 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002151245.jpeg&height=100) | Algae | Nostocaceae | Cylindrospermopsis raciborskii | Cylindro | Indo-Pacific | 1971 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002151942.gif&height=100) | Algae | Fragilariaceae | Diatoma ehrenbergii | A pennate diatom | Unknown | 1938 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107113804.jpg&height=100) | Algae | Stephanodiscaceae | Discostella pseudostelligera | A centric diatom | Unknown | 1935 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107131934.jpg&height=100) | Algae | Stephanodiscaceae | Discostella woltereckii | A centric diatom | Unknown | 1964 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107115252.jpg&height=100) | Algae | Hymenomonadaceae | Hymenomonas roseola | A coccolithophorid | Europe | 1975 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2015/20151105104745.jpg&height=100) | Algae | Characeae | Nitellopsis obtusa | Starry stonewort | Eurasia | 1981 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071221121755.jpg&height=100) | Algae | Triceratiaceae | Pleurosira laevis | A centric diatom | Europe and Africa | 1978 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107161320.jpg&height=100) | Algae | Skeletonemataceae | Skeletonema potamos | A centric diatom | Unknown | 1963 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080110103645.jpg&height=100) | Algae | Skeletonemaceae | Skeletonema subsalsum | A centric diatom | Eurasia | 1973 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2009/20090612105753.jpg&height=100) | Algae | Sphacelariaceae | Sphacelaria fluviatilis | A brown alga | Asia | 1975 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2018/20180806132628.PNG&height=100) | Algae | Sphacelariaceae | Sphacelaria lacustris | A brown alga | Unknown | 1975 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107123945.jpg&height=100) | Algae | Stephanodiscaceae | Stephanodiscus binderanus | A centric diatom | Eurasia | 1930 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/&height=100) | Algae | Stephanodiscaceae | Stephanodiscus subtilis | A centric diatom | Eurasia | 1946 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080110104044.jpg&height=100) | Algae | Thalassiosiraceae | Thalassiosira baltica | A centric diatom | Eurasia | 1988 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107124200.jpg&height=100) | Algae | Thalassiosiraceae | Thalassiosira bramaputrae | A centric diatom | Unknown | 1978 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107124308.jpg&height=100) | Algae | Thalassiosiraceae | Thalassiosira pseudonana | A centric diatom | Unknown | 1973 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002152016.gif&height=100) | Algae | Thalassiosiraceae | Thalassiosira weissflogii | A centric diatom | Unknown | 1962 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080110103155.jpg&height=100) | Algae | Ulvaceae | Ulva (Enteromorpha) flexuosa subsp. flexuosa and flexuosa subsp. paradoxa | Green alga, grass kelp | Unknown | 2003 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120117131033.jpg&height=100) | Algae | Ulvaceae | Ulva (Enteromorpha) intestinalis | Green alga, grass kelp | North America | 1926 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2009/20090611112615.jpg&height=100) | Algae | Ulvaceae | Ulva (Enteromorpha) prolifera | Green alga, grass kelp, sea lettuce | North America | 1979 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2009/20090611105342.jpg&height=100) | Annelids-Oligochaetes | Tubificidae | Branchiura sowerbyi | A tubificid worm | Asia | 1951 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/&height=100) | Annelids-Oligochaetes | Tubificidae | Gianius aquaedulcis | A tubificid worm | Europe | 1983 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190708121314.bmp&height=100) | Annelids-Oligochaetes | Tubificidae | Potamothrix bedoti | A tubificid worm | Eurasia | 1975 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190618145221.jpg&height=100) | Annelids-Oligochaetes | Tubificidae | Potamothrix moldaviensis | A tubificid worm | Eurasia | 1952 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190708120457.bmp&height=100) | Annelids-Oligochaetes | Tubificidae | Potamothrix vejdovskyi | A tubificid worm | Eurasia | 1965 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2018/20180514095402.jpg&height=100) | Annelids-Oligochaetes | Naididae | Ripistes parasita | An oligochaete | Eurasia | 1980 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071010151708.jpg&height=100) | Bacteria | Pseudomonadaceae | Aeromonas salmonicida | Furunculosis, ulcer disease, erythrodermatitis | Unknown | 1999 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120727171621.bmp&height=100) | Bacteria | | Piscirickettsia cf. salmonis | Muskie pox | Unknown | 2002 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071011163231.jpg&height=100) | Bacteria | Corynebacteriaceae | Renibacterium (Corynebacterium) salmoninarum | Bacterial kidney disease (BKD), Dee disease | Europe | 1967 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051116113401.jpg&height=100) | Bryozoans | Vesiculariidae | Lophopodella carteri | Asian freshwater bryozoan | Asia | 1934 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120313093703.JPG&height=100) | Coelenterates-Hydrozoans | Oceanidae | Cordylophora caspia | Freshwater hydroid | Eurasia | 1956 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20050818184747.jpg&height=100) | Coelenterates-Hydrozoans | Olindiidae | Craspedacusta sowerbii | Freshwater jellyfish | Asia | 1933 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071010164909.jpg&height=100) | Crustaceans-Amphipods | Gammaridae | Echinogammarus ischnus | Scud | Europe | 1994 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2010/20100406112736.jpg&height=100) | Crustaceans-Amphipods | Gammaridae | Gammarus tigrinus | Tiger scud | North America | 1985 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120104102102.jpg&height=100) | Crustaceans-Cladocerans | Cercopagidae | Bythotrephes longimanus | Spiny waterflea | Europe | 1982 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120124112334.JPG&height=100) | Crustaceans-Cladocerans | Cercopagidae | Cercopagis pengoi | Fishhook waterflea | Asia | 1998 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190530153216.jpg&height=100) | Crustaceans-Cladocerans | Daphniidae | Daphnia galeata galeata | A waterflea | Eurasia | 1980 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051115133958.JPG&height=100) | Crustaceans-Cladocerans | Daphniidae | Daphnia lumholtzi | A waterflea | Unknown | 1999 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2018/20180813094239.jpg&height=100) | Crustaceans-Cladocerans | Sididae | Diaphanosoma fluviatile | A cladoceran | South and Central America | 2015 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071211153534.jpg&height=100) | Crustaceans-Cladocerans | Bosminidae | Eubosmina coregoni | Baltic Long-nosed Waterflea | Europe | 1966 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190812083938.jpg&height=100) | Crustaceans-Cladocerans | Bosminidae | Eubosmina maritima | A cladoceran | Eurasia | 1988 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107103133.jpg&height=100) | Crustaceans-Copepods | Argulidae | Argulus japonicus | Japanese fishlouse | Asia | 1989 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107113130.jpg&height=100) | Crustaceans-Copepods | Cyclopidae | Cyclops strenuus | A copepod | North America | 1972 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120105095313.jpg&height=100) | Crustaceans-Copepods | Temoridae | Eurytemora affinis | A calanoid copepod | North America | 1958 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107114952.jpg&height=100) | Crustaceans-Copepods | Canthocamptidae | Heteropsyllus nr. nunni | A copepod | Unknown | 1996 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107120308.jpg&height=100) | Crustaceans-Copepods | Cyclopidae | Megacyclops viridis | A cyclopoid copepod | Europe | 1994 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2018/20180810125825.JPG&height=100) | Crustaceans-Copepods | Cyclopidae | Mesocyclops pehpeiensis | A copepod | Asia | 2016 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107121225.jpg&height=100) | Crustaceans-Copepods | Ergasilidae | Neoergasilus japonicus | A parasitic copepod | Asia | 1994 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107121507.jpg&height=100) | Crustaceans-Copepods | Ameiridae | Nitokra hibernica | A harpacticoid copepod | Eurasia | 1972 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/&height=100) | Crustaceans-Copepods | Ameiridae | Nitokra incerta | A harpacticoid copepod | Eurasia | 1999 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2021/20210608145946.jpg&height=100) | Crustaceans-Copepods | Lernaeopodidae | Salmincola californiensis | Gill maggot | Unknown | 2014 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107122706.jpg&height=100) | Crustaceans-Copepods | Lernaeopodidae | Salmincola lotae | A parasitic copepod | Eurasia | 1964 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107122815.jpg&height=100) | Crustaceans-Copepods | Diosaccidae | Schizopera borutzkyi | An oarsman | Europe | 1999 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107123351.jpg&height=100) | Crustaceans-Copepods | Diaptomidae | Skistodiaptomus pallidus | A calanoid copepod | North America | 1967 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2016/20161104165703.jpg&height=100) | Crustaceans-Copepods | Cyclopidae | Thermocyclops crassus | A copepod | Europe and Africa | 2014 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190514092154.jpeg&height=100) | Crustaceans-Crayfish | Cambaridae | Procambarus clarkii | Red Swamp Crayfish | North America | 1967 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2010/20100311110205.jpg&height=100) | Crustaceans-Mysids | Mysidae | Hemimysis anomala | Bloody red shrimp | Eurasia | 2006 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2024/20240314110823.jpg&height=100) | Entoprocts | Barentsiidae | Urnatella gracilis | Freshwater goblet worm | North America | 2023 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2010/20100312115859.jpg&height=100) | Fishes | Clupeidae | Alosa aestivalis | Blueback Herring | North America | 1981 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190702130453.png&height=100) | Fishes | Clupeidae | Alosa pseudoharengus | Alewife | North America | 1868 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120118134634.jpg&height=100) | Fishes | Gasterosteidae | Apeltes quadracus | Fourspine Stickleback | North America | 1986 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2006/20060203151344.jpg&height=100) | Fishes | Cyprinidae | Carassius auratus | Goldfish | Asia | 1880 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190724103502.jpg&height=100) | Fishes | Cyprinidae | Ctenopharyngodon idella | Grass Carp (diploid) | Asia | 2011 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190613114428.jpg&height=100) | Fishes | Cyprinidae | Cyprinus carpio | Common Carp | Eurasia | 1880 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2020/20200108151325.jpg&height=100) | Fishes | Centrarchidae | Enneacanthus gloriosus | Bluespotted Sunfish | North America | 1916 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080111112619.jpg&height=100) | Fishes | Poeciliidae | Gambusia affinis | Western Mosquitofish | North America | 1923 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051104171358.jpg&height=100) | Fishes | Percidae | Gymnocephalus cernua | Ruffe | Eurasia | 1986 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190506142214.jpg&height=100) | Fishes | Catostomidae | Ictiobus bubalus | Smallmouth Buffalo | North America | 1965 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20050819153908.jpg&height=100) | Fishes | Catostomidae | Ictiobus cyprinellus | Bigmouth Buffalo | North America | 1962 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120126090602.jpg&height=100) | Fishes | Catostomidae | Ictiobus niger | Black Buffalo | North America | 1986 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051108155256.bmp&height=100) | Fishes | Lepisosteidae | Lepisosteus platostomus | Shortnose Gar | North America | 1962 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2021/20210219095517.jpg&height=100) | Fishes | Centrarchidae | Lepomis humilis | Orangespotted Sunfish | North America | 1929 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2024/20240724204042.jpg&height=100) | Fishes | Centrarchidae | Lepomis microlophus | Redear Sunfish | North America | 1928 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190524085757.jpg&height=100) | Fishes | Cobitidae | Misgurnus anguillicaudatus | Pond Loach | Asia | 1939 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190521125342.jpg&height=100) | Fishes | Moronidae | Morone americana | White Perch | North America | 1946 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190828083712.jpg&height=100) | Fishes | Gobiidae | Neogobius melanostomus | Round Goby | Eurasia | 1990 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051104121107.jpg&height=100) | Fishes | Ictaluridae | Noturus insignis | Margined Madtom | North America | 1928 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2011/20111116134256.jpg&height=100) | Fishes | Salmonidae | Oncorhynchus gorbuscha | Pink Salmon | North America | 1956 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051108124449.jpg&height=100) | Fishes | Salmonidae | Oncorhynchus kisutch | Coho Salmon | North America | 1933 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190628101304.png&height=100) | Fishes | Salmonidae | Oncorhynchus mykiss | Rainbow Trout | North America | 1876 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190628102603.jpg&height=100) | Fishes | Salmonidae | Oncorhynchus nerka | Sockeye Salmon | North America | 1950 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190628094514.jpg&height=100) | Fishes | Salmonidae | Oncorhynchus tshawytscha | Chinook Salmon | North America | 1870 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20070125135923.jpg&height=100) | Fishes | Osmeridae | Osmerus mordax | Rainbow Smelt | North America | 1906 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2016/20160929121124.jpg&height=100) | Fishes | Petromyzontidae | Petromyzon marinus | Sea Lamprey | North America | 1835 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2011/20111221160929.jpg&height=100) | Fishes | Gobiidae | Proterorhinus semilunaris | Freshwater Tubenose Goby | Eurasia | 1990 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051104121418.jpg&height=100) | Fishes | Ictaluridae | Pylodictis olivaris | Flathead Catfish | North America | 1890 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190606095618.JPG&height=100) | Fishes | Salmonidae | Salmo trutta | Brown Trout | Europe | 1883 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190814142313.jpg&height=100) | Fishes | Cyprinidae | Scardinius erythrophthalmus | Rudd | Eurasia | 1931 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071010155552.jpg&height=100) | Insects | Crambidae | Acentria ephemerella | (European) aquatic/water moth | Europe | 1938 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120117131755.jpg&height=100) | Insects | Erirhinidae | Tanysphyrus lemnae | Duckweed/aquatic weevil | Europe | 1934 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051110110923.jpg&height=100) | Mollusks-Bivalves | Cyrenidae | Corbicula fluminea | Basket clam | Asia | 1980 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080612123550.jpg&height=100) | Mollusks-Bivalves | Dreissenidae | Dreissena bugensis | Quagga mussel | Eurasia | 1989 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051116094832.jpg&height=100) | Mollusks-Bivalves | Dreissenidae | Dreissena polymorpha | Zebra mussel | Eurasia | 1986 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120116154014.jpg&height=100) | Mollusks-Bivalves | Unionidae | Lasmigona subviridis | Green floater | North America | 1959 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051116104932.JPG&height=100) | Mollusks-Bivalves | Sphaeriidae | Pisidium amnicum | Greater European peaclam | Eurasia | 1897 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107121634.jpg&height=100) | Mollusks-Bivalves | Sphaeriidae | Pisidium henslowanum | Henslow peaclam | Eurasia | 1916 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071010143248.jpg&height=100) | Mollusks-Bivalves | Sphaeriidae | Pisidium moitessierianum | Pygmy peaclam | Eurasia | 1895 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107121756.jpg&height=100) | Mollusks-Bivalves | Sphaeriidae | Pisidium supinum | Humpbacked peaclam | Eurasia | 1959 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051116105512.JPG&height=100) | Mollusks-Bivalves | Pisidiidae | Sphaerium corneum | European fingernail clam | Eurasia | 1900 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051116103353.JPG&height=100) | Mollusks-Gastropods | Bithyniidae | Bithynia tentaculata | Mud bithynia | Europe | 1800 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051116110839.JPG&height=100) | Mollusks-Gastropods | Viviparidae | Cipangopaludina chinensis | Chinese mysterysnail | Asia | 1931 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2016/20160930124540.png&height=100) | Mollusks-Gastropods | Viviparidae | Cipangopaludina japonica | Japanese mysterysnail | Asia | 1937 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051116103713.JPG&height=100) | Mollusks-Gastropods | Pleuroceridae | Elimia virginica | Piedmont elimia | North America | 1860 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051116104032.JPG&height=100) | Mollusks-Gastropods | Hydrobiidae | Gillia altilis | Buffalo pebblesnail | North America | 1915 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2011/20110314095956.jpg&height=100) | Mollusks-Gastropods | Hydrobiidae | Potamopyrgus antipodarum | New Zealand mudsnail | Eurasia | 1991 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051116105324.JPG&height=100) | Mollusks-Gastropods | Lymnaeidae | Radix auricularia | European ear snail | Europe | 1901 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2021/20210304161048.jpg&height=100) | Mollusks-Gastropods | Lymnaeidae | Stagnicola palustris | Marsh pond snail | North America | 1933 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2005/20051116110009.JPG&height=100) | Mollusks-Gastropods | Valvatidae | Valvata piscinalis | European stream valvata | Europe | 1897 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2018/20181120142708.jpeg&height=100) | Mollusks-Gastropods | Viviparidae | Viviparus georgianus | Banded mysterysnail | North America | 1866 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2023/20231109083432.jpg&height=100) | Nematodes | Anguillicolidae | Anguillicola crassus | Eel swim bladder parasite | Asia | 2011 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107102759.jpg&height=100) | Plants | Poaceae | Agrostis gigantea | Redtop | Eurasia | 1838 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002152144.jpg&height=100) | Plants | Betulaceae | Alnus glutinosa | Black alder | Eurasia | 1913 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071203141728.jpg&height=100) | Plants | Poaceae | Alopecurus geniculatus | Water foxtail | Eurasia | 1882 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071010155956.jpg&height=100) | Plants | Butomaceae | Butomus umbellatus | Flowering rush | Eurasia | 1905 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2016/20161026142039.jpg&height=100) | Plants | Cabombaceae | Cabomba caroliniana | Carolina fanwort | North America | 1935 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107112200.jpg&height=100) | Plants | Cyperaceae | Carex acutiformis | Lesser pond sedge | Eurasia | 1951 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107112410.jpg&height=100) | Plants | Cyperaceae | Carex disticha | Tworank sedge | Eurasia | 1866 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071203145211.jpg&height=100) | Plants | Amaranthaceae | Chenopodium glaucum | Oakleaf goosefoot | Eurasia | 1865 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107112802.jpg&height=100) | Plants | Asteraceae | Cirsium palustre | Marsh thistle | Eurasia | 1934 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002161257.jpg&height=100) | Plants | Apiaceae | Conium maculatum | Poison-hemlock | Eurasia | 1843 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002161453.jpg&height=100) | Plants | Poaceae | Echinochloa crus-galli | Barnyardgrass | Eurasia | 1838 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107114500.jpg&height=100) | Plants | Onagraceae | Epilobium hirsutum | Hairy willow herb | Eurasia | 1874 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2022/20220711091134.jpg&height=100) | Plants | Rosaceae | Filipendula ulmaria | Queen of the meadow | Eurasia | 1916 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20070205143023.jpg&height=100) | Plants | Poaceae | Glyceria maxima | Reed mannagrass | Eurasia | 1940 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2016/20160315105713.jpg&height=100) | Plants | Hydrocharitaceae | Hydrilla verticillata | Hydrilla | Asia | 2000 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071203141530.jpg&height=100) | Plants | Hydrocharitaceae | Hydrocharis morsus-ranae | European frogbit | Europe | 1972 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071010160914.jpg&height=100) | Plants | Balsaminaceae | Impatiens glandulifera | Ornamental jewelweed | Asia | 1912 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120123180643.JPG&height=100) | Plants | Iridaceae | Iris pseudacorus | Yellow iris | Europe and Africa | 1882 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107115736.jpg&height=100) | Plants | Juncaceae | Juncus compressus | Roundfruit rush | Eurasia | 1895 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107115602.jpg&height=100) | Plants | Juncaceae | Juncus inflexus | European meadow rush | Eurasia | 1922 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107115858.jpg&height=100) | Plants | Fabaceae | Lupinus polyphyllus | Marsh lupine | North America | 1959 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002162358.jpg&height=100) | Plants | Lamiaceae | Lycopus asper | Rough bugleweed | North America | 1892 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107120022.jpg&height=100) | Plants | Lamiaceae | Lycopus europaeus | European bugleweed | Eurasia | 1903 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002162559.jpg&height=100) | Plants | Primulaceae | Lysimachia nummularia | Creeping jenny | Eurasia | 1882 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071010161840.jpg&height=100) | Plants | Primulaceae | Lysimachia vulgaris | Garden loosestrife | Eurasia | 1912 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2009/20090220191040.jpg&height=100) | Plants | Lythraceae | Lythrum salicaria | Purple loosestrife | Eurasia | 1869 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107120147.jpg&height=100) | Plants | Marsileaceae | Marsilea quadrifolia | European water-clover | Eurasia | 1893 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107120445.jpg&height=100) | Plants | Lamiaceae | Mentha × gracilis | Gingermint | Eurasia | 1896 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002162814.jpg&height=100) | Plants | Lamiaceae | Mentha aquatica | Water mint | Eurasia | 1843 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002162952.jpg&height=100) | Plants | Lamiaceae | Mentha spicata | Spearmint | Eurasia | 1843 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2022/20220714095245.jpg&height=100) | Plants | Poaceae | Microstegium vimineum | Japanese stiltgrass | Eurasia | 1991 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002163126.jpg&height=100) | Plants | Boraginaceae | Myosotis scorpioides | Forget-me-not | Eurasia | 1886 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071203141442.jpg&height=100) | Plants | Caryophyllaceae | Myosoton aquaticum | Giant chickweed | Eurasia | 1894 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2022/20220211082421.jpg&height=100) | Plants | Haloragaceae | Myriophyllum spicatum | Eurasian watermilfoil | Eurasia | 1880 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071001205456.jpg&height=100) | Plants | Hydrocharitaceae | Najas minor | Brittle waternymph | Eurasia | 1932 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002164158.jpg&height=100) | Plants | Brassicaceae | Nasturtium officinale | Water-cress | Eurasia | 1847 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2016/20160323150540.jpg&height=100) | Plants | Menyanthaceae | Nymphoides peltata | Yellow floating-heart | Eurasia | 1930 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002163653.jpg&height=100) | Plants | Polygonaceae | Persicaria maculosa | Spotted ladysthumb | Eurasia | 1838 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2016/20160516105924.jpg&height=100) | Plants | Poaceae | Phalaris arundinacea | Reed canarygrass | North America | 1838 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2015/20150702142642.jpg&height=100) | Plants | Poaceae | Phragmites australis australis | Common reed | Europe | 1828 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071203141626.jpg&height=100) | Plants | Asteraceae | Pluchea odorata | Sweetscent | North America | 1912 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107121951.jpg&height=100) | Plants | Poaceae | Poa trivialis | Rough bluegrass | Eurasia | 1843 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2016/20160218092225.JPG&height=100) | Plants | Potamogetonaceae | Potamogeton crispus | Curly-leaf pondweed | Eurasia | 1879 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002164011.jpg&height=100) | Plants | Poaceae | Puccinellia distans | Weeping alkaligrass | Eurasia | 1893 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002152416.jpg&height=100) | Plants | Rhamnaceae | Rhamnus frangula | Glossy buckthorn | Eurasia | 1913 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002164448.jpg&height=100) | Plants | Brassicaceae | Rorippa sylvestris | Keek | Eurasia | 1884 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107122428.jpg&height=100) | Plants | Polygonaceae | Rumex longifolius | Door-yard dock | Eurasia | 1901 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107122548.jpg&height=100) | Plants | Polygonaceae | Rumex obtusifolius | Bluntleaf dock | Eurasia | 1837 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002164641.jpg&height=100) | Plants | Salicaceae | Salix alba | Golden willow | Eurasia | 1886 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20191004121801.jpg&height=100) | Plants | Salicaceae | Salix caprea | Goat willow | Eurasia | 1905 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2023/20231018095934.jpg&height=100) | Plants | Salicaceae | Salix cf. cinerea/atrocinerea | Large gray willow | Europe and Africa | 1980 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071010162124.jpg&height=100) | Plants | Salicaceae | Salix fragilis | Crack willow | Eurasia | 1886 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2019/20190815105717.jpg&height=100) | Plants | Salicaceae | Salix purpurea | Purple osier | Eurasia | 1880 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071010162420.jpg&height=100) | Plants | Solanaceae | Solanum dulcamara | Bitter nightshade | Eurasia | 1860 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107123720.jpg&height=100) | Plants | Asteraceae | Solidago sempervirens | Seaside goldenrod | North America | 1969 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2023/20231102135506.jfif&height=100) | Plants | Hydrocharitaceae | Stratiotes aloides | Water soldiers | Eurasia | 2009 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120424152229.jpg&height=100) | Plants | Lythraceae | Trapa natans | Water chestnut | Eurasia | 1949 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2007/20071002152522.jpg&height=100) | Plants | Typhaceae | Typha angustifolia | Narrow-leaved cattail | Eurasia | 1877 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107124748.jpg&height=100) | Plants | Plantaginaceae | Veronica beccabunga | European speedwell | Europe | 1849 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2009/20090615100213.bmp&height=100) | Platyhelminthes | Dactylogyridae | Dactylogyrus amphibothrium | A monogenetic fluke | Eurasia | 1992 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2009/20090615100625.bmp&height=100) | Platyhelminthes | Dactylogyridae | Dactylogyrus hemiamphibothrium | A monogenetic fluke | Eurasia | 1992 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/&height=100) | Platyhelminthes | Strigeidae | Ichthyocotylurus pileatus | A digenean fluke | Eurasia | 1929 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/&height=100) | Platyhelminthes | Diplostomatidae | Neascus brevicaudatus | A digenean fluke, trematode | Eurasia | 1992 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2009/20090611112044.jpg&height=100) | Platyhelminthes | Dugesiidae | Schmidtea polychroa | A flatworm | Europe | 1968 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120727165840.bmp&height=100) | Platyhelminthes | Bothriocephalidae | Schyzocotyle acheilognathi | Asian tapeworm | Asia | 2001 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2009/20090612104248.gif&height=100) | Platyhelminthes | | Scolex pleuronectis | A cestode | Eurasia | 1994 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2009/20090612113646.jpg&height=100) | Platyhelminthes | Acanthostomatidae | Timoniella sp. | A digenean fluke, trematode | Unknown | 1992 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2009/20090624133447.jpg&height=100) | Protozoans | Acinetidae | Acineta nitocrae | A suctorian ciliate | Eurasia | 1997 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2009/20090611115019.jpg&height=100) | Protozoans | Glugeidae | Glugea hertwigi | A microsporidian parasite | Europe | 1960 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2008/20080107115130.jpg&height=100) | Protozoans | Glugeidae | Heterosporis sutherlandae | A microsporidian parasite | Unknown | 2000 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2009/20090624165538.jpg&height=100) | Protozoans | Myxosomatidae | Myxobolus cerebralis | Salmonid whirling disease | Europe | 1968 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120725131721.bmp&height=100) | Protozoans | Psammonobiotidae | Psammonobiotus communis | A testate amoeba | Eurasia | 2002 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120725132331.bmp&height=100) | Protozoans | Psammonobiotidae | Psammonobiotus dziwnowi | A testate amoeba | Eurasia | 2002 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120725132907.bmp&height=100) | Protozoans | Psammonobiotidae | Psammonobiotus linearis | A testate amoeba | Eurasia | 2002 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/&height=100) | Protozoans | | Sphaeromyxa sevastopoli | A myxosporean parasite | Eurasia | 1994 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/&height=100) | Protozoans | | Trypanosoma acerinae | A flagellate parasite | Eurasia | 1985 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120424152905.JPG&height=100) | Viruses | Novirhabdoviridae | Novirhabdovirus sp. genotype IV sublineage b | Viral Hemorrhagic Septicemia Virus (VHSV-IVb) | North America | 2003 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2009/20090612101024.JPG&height=100) | Viruses | Iridoviridae | Ranavirus | Largemouth bass virus (LMBV) | Unknown | 2000 | Nonindigenous |
![](/Thumbnail.ashx?filename=/XIMAGESERVERX/2012/20120424150629.JPG&height=100) | Viruses | | Rhabdovirus carpio | Spring viremia of carp (SVC) | Eurasia | 2001 | Nonindigenous |