# List of invasive aquatic species in Montana

Montana, USA, has a wide variety of invasive aquatic species ranging from algae to turtles. The effect each invasive species has on the environment varies greatly, some species are devastating while others are negligible. Aquatic plants and algae may easily be transported from lake to lake by boaters who do not take the necessary precautions when launching their boats into new bodies of water. Sometimes, pet owners release their pets into a non-native habitat where they will actually thrive and eventually establish a population and then begin to displace the native species that it competes with.

## Algae

| Media | Family | Scientific name | Common name | Origin |
| | Gomphonemataceae | Didymosphenia geminata | Didymo | Cryptogenic |

## Amphibians

| Media | Family | Scientific name | Common name | Origin |
| | Ranidae | Lithobates catesbeianus | American bullfrog | Native transplant |
| | Hylidae | Pseudacris regilla | Northern Pacific tree frog | Native transplant |

## Fish

| Family | Scientific Name | Common name | Origin |
| Centrarchidae | Ambloplites rupestris | Rock bass | Native transplant |
| Ictaluridae | Ameiurus melas | Black bullhead | Native transplant |
| Ictaluridae | Ameiurus natalis | Yellow bullhead | Native transplant |
| Cyprinidae | Carassius auratus | Goldfish | Exotic |
| Catostomidae | Catostomus ardens | Utah sucker | Native transplant |
| Catostomidae | Catostomus commersonii | White sucker | Native transplant |
| Salmonidae | Coregonus artedi | Cisco | Native transplant |
| Salmonidae | Coregonus clupeaformis | Lake whitefish | Native transplant |
| Cyprinidae | Couesius plumbeus | Lake chub | Native transplant |
| Gasterosteidae | Culaea inconstans | Brook stickleback | Native transplant |
| Cyprinidae | Cyprinus carpio | Common carp | Exotic |
| Esocidae | Esox lucius | Northern pike | Native transplant |
| Esocidae | Esox lucius × masquinongy | Tiger muskellunge | Native hybrid |
| Fundulidae | Fundulus kansae | Northern Plains killifish | Native transplant |
| Fundulidae | Fundulus zebrinus | Plains killifish | Native transplant |
| Poeciliidae | Gambusia affinis | Western mosquitofish | Native transplant |
| Cyprinidae | Gila atraria | Utah chub | Native transplant |
| Ictaluridae | Ictalurus punctatus | Channel catfish | Native transplant |
| Centrarchidae | Lepomis cyanellus | Green sunfish | Native transplant |
| Centrarchidae | Lepomis gibbosus | Pumpkinseed | Native transplant |
| Centrarchidae | Lepomis macrochirus | Bluegill | Native transplant |
| Centrarchidae | Micropterus dolomieu | Smallmouth bass | Native transplant |
| Centrarchidae | Micropterus salmoides | Largemouth bass | Native transplant |
| Moronidae | Morone chrysops | White bass | Native transplant |
| Cyprinidae | Notemigonus crysoleucas | Golden shiner | Native transplant |
| Cyprinidae | Notropis hudsonius | Spottail shiner | Native transplant |
| Salmonidae | Oncorhynchus aguabonita | Golden trout | Native transplant |
| Salmonidae | Oncorhynchus clarkii bouvieri | Yellowstone cutthroat trout | Native transplant |
| Salmonidae | Oncorhynchus clarkii lewisi | Westslope cutthroat trout | Native transplant |
| Salmonidae | Oncorhynchus clarkii × mykiss | Cutbow trout | Native hybrid |
| Salmonidae | Oncorhynchus kisutch | Coho salmon | Native transplant |
| Salmonidae | Oncorhynchus mykiss | Rainbow trout | Native transplant |
| Salmonidae | Oncorhynchus mykiss ssp. | Redband trout | Native transplant |
| Salmonidae | Oncorhynchus nerka | Sockeye salmon | Native transplant |
| Salmonidae | Oncorhynchus tshawytscha | Chinook salmon | Native transplant |
| Cichlidae | Oreochromis mossambicus | Mozambique tilapia | Exotic |
| Osmeridae | Osmerus mordax | Rainbow smelt | Native transplant |
| Percidae | Perca flavescens | Yellow perch | Native transplant |
| Characidae | Piaractus brachypomus | Pirapitinga, red-bellied pacu | Exotic |
| Cyprinidae | Pimephales promelas | Fathead minnow | Native transplant |
| Poeciliidae | Poecilia latipinna | Sailfin molly | Native transplant |
| Poeciliidae | Poecilia mexicana | Shortfin molly | Exotic |
| Poeciliidae | Poecilia reticulata | Guppy | Exotic |
| Poeciliidae | Poecilia sphenops | Mexican molly | Exotic |
| Centrarchidae | Pomoxis annularis | White crappie | Native transplant |
| Centrarchidae | Pomoxis nigromaculatus | Black crappie | Native transplant |
| Cyprinidae | Richardsonius balteatus | Redside shiner | Exotic |
| Salmonidae | Salmo letnica | Ohrid trout | Exotic |
| Salmonidae | Salmo salar sebago | Atlantic salmon | Native transplant |
| Salmonidae | Salmo trutta | Brown trout | Exotic |
| Salmonidae | Salmo trutta × Salvelinus fontinalis | Tiger trout | Exotic hybrid |
| Salmonidae | Salvelinus fontinalis | Brook trout | Native transplant |
| Salmonidae | Salvelinus namaycush | Lake trout | Native transplant |
| Percidae | Sander canadensis × vitreus | Saugeye | Native hybrid |
| Percidae | Sander vitreus | Walleye | Native transplant |
| Salmonidae | Thymallus arcticus | Arctic grayling | Native transplant |
| Umbridae | Umbra limi | Central mudminnow | Native transplant |
| Poeciliidae | Xiphophorus hellerii | Green swordtail | Exotic |
| Poeciliidae | Xiphophorus maculatus | Southern platyfish | Exotic |
| Poeciliidae | Xiphophorus variatus | Variable platyfish | Exotic |

## Aquatic mammals

| Media | Family | Scientific name | Common name | Origin |
| | Myocastoridae | Myocastor coypus | Nutria | Exotic |

## Mollusks

| Family | Scientific name | Common name | Origin |
| Cyrenidae | Corbicula fluminea | Asian clam | Exotic |
| Dreissenidae | Dreissena sp. | Zebra muscle | Exotic |
| Bithyniidae | Bithynia tentaculata | Mud bithynia, faucet snail | Exotic |
| Thiaridae | Melanoides tuberculata | Red-rim melania | Exotic |
| Physidae | Physella acuta | Acute bladder snail | Native transplant |
| Hydrobiidae | Potamopyrgus antipodarum | New Zealand mudsnail | Exotic |
| Lymnaeidae | Radix auricularia | European ear snail | Exotic |

## Aquatic plants

| Family | Scientific name | Common name | Origin |
| Poaceae | Alopecurus geniculatus | Water foxtail | Exotic |
| Butomaceae | Butomus umbellatus | Flowering rush | Exotic |
| Plantaginaceae | Callitriche stagnalis | Pond water-starwort | Exotic |
| Iridaceae | Iris pseudacorus | Yellow iris | Exotic |
| Juncaceae | Juncus compressus | Roundfruit rush | Exotic |
| Juncaceae | Juncus gerardii | Saltmeadow rush | Native transplant |
| Lythraceae | Lythrum salicaria | Purple loosestrife | Exotic |
| Boraginaceae | Myosotis scorpioides | Forget-me-not | Exotic |
| Haloragaceae | Myriophyllum aquaticum | Parrot feather | Exotic |
| Haloragaceae | Myriophyllum spicatum | Eurasian watermilfoil | Exotic |
| Hydrocharitaceae | Najas marina | Holly-leaf waternymph | Native transplant |
| Brassicaceae | Nasturtium officinale | water-cress | Exotic |
| Nymphaeaceae | Nymphaea odorata | American white waterlily | Native transplant |
| Poaceae | Phalaris arundinacea | Reed canarygrass | Exotic |
| Potamogetonaceae | Potamogeton crispus | Curly-leaf pondweed | Exotic |
| Brassicaceae | Rorippa sylvestris | Keek | Exotic |
| Tamaricaceae | Tamarix | Tamarisk | Exotic |
| Typhaceae | Typha angustifolia | Narrow-leaved cattail | Exotic |
| Hydrocharitaceae | Vallisneria americana | Wild-celery | Native transplant |

## Reptiles

| Media | Family | Scientific name | Common name | Origin |
| | Chelydridae | Chelydra serpentina | Snapping turtle | Native transplant |

## Crustaceans

| Family | Scientific name | Common name | Origin |
| Gammaridae | Gammarus sp. | Amphipod | Native transplant |
| Cambaridae | Faxonius virilis | Virile crayfish, northern crayfish | Native transplant |
| Mysidae | Mysis diluviana | Opossum shrimp | Native transplant |