NAS - Nonindigenous Aquatic Species

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NAS Graphs and Charts: All Introduced Aquatic Species in the US



**Click on a graph to see the data**

The graph shows the cumulative number of species that have been introduced up until the last year listed.
up to present: 1599 species up to 2000: 1490 species up to 1950: 507 species up to 1900: 191 species up to present: 1599 species up to 2000: 1490 species up to 1950: 507 species up to 1900: 191 species Introduced Species in United States
This graph shows the percentage of species that are native transplants (native to a portion of the US but moved to a non-native area in the US) and exotic transplants (not native to the US).
Exotic to US: 812 species Exotic to US: 812 species Native Transplants: 631 species Native Transplants: 631 species Cryptogenic: 76 species Cryptogenic: 76 species Unknown: 39 species Unknown: 39 species Hybrid: 34 species Hybrid: 34 species Introduced Species in United States
This graph shows the proportion of species that have been introduced into the United States that belong to various taxonomic groups.
Fishes: 675 species Fishes: 675 species Plants: 140 species Plants: 140 species Mollusks-Gastropods: 94 species Mollusks-Gastropods: 94 species Mollusks-Bivalves: 89 species Mollusks-Bivalves: 89 species Annelids-Polychaetes: 45 species Annelids-Polychaetes: 45 species Reptiles-Turtles: 41 species Reptiles-Turtles: 41 species Coelenterates-Hydrozoans: 40 species Coelenterates-Hydrozoans: 40 species Crustaceans-Amphipods: 40 species Crustaceans-Amphipods: 40 species Amphibians-Frogs: 39 species Amphibians-Frogs: 39 species Tunicates: 37 species Tunicates: 37 species Crustaceans-Copepods: 36 species Crustaceans-Copepods: 36 species Bryozoans: 34 species Bryozoans: 34 species Sponges: 30 species Sponges: 30 species Algae: 28 species Algae: 28 species Crustaceans-Crabs: 23 species Crustaceans-Crabs: 23 species Crustaceans-Crayfish: 22 species Crustaceans-Crayfish: 22 species Crustaceans-Isopods: 21 species Crustaceans-Isopods: 21 species Annelids-Oligochaetes: 19 species Annelids-Oligochaetes: 19 species Crustaceans-Shrimp: 18 species Crustaceans-Shrimp: 18 species Reptiles-Snakes: 14 species Reptiles-Snakes: 14 species Crustaceans-Barnacles: 10 species Crustaceans-Barnacles: 10 species Mollusks-Nudibranchs: 10 species Mollusks-Nudibranchs: 10 species Platyhelminthes: 9 species Platyhelminthes: 9 species Protozoans: 9 species Protozoans: 9 species Crustaceans-Cladocerans: 8 species Crustaceans-Cladocerans: 8 species Amphibians-Salamanders: 8 species Amphibians-Salamanders: 8 species Coelenterates-Anthozoan: 8 species Coelenterates-Anthozoan: 8 species Arthropoda-Pycogonid: 6 species Arthropoda-Pycogonid: 6 species Mammals: 6 species Mammals: 6 species Crustaceans-Tanaids: 5 species Crustaceans-Tanaids: 5 species Crustaceans-Mysids: 5 species Crustaceans-Mysids: 5 species Coelenterates-Scyphozoan: 5 species Coelenterates-Scyphozoan: 5 species Reptiles-Lizards: 5 species Reptiles-Lizards: 5 species Reptiles-Crocodilians: 4 species Reptiles-Crocodilians: 4 species Bacteria: 3 species Bacteria: 3 species Viruses: 3 species Viruses: 3 species Arthropoda: 2 species Arthropoda: 2 species Mollusks-Cephalopods: 2 species Mollusks-Cephalopods: 2 species Entoprocts: 2 species Entoprocts: 2 species Crustaceans-Ostracods: 1 species Crustaceans-Ostracods: 1 species Crustaceans-Sea fleas: 1 species Crustaceans-Sea fleas: 1 species Polyplacophors: 1 species Polyplacophors: 1 species Crustaceans-Lobsters: 1 species Crustaceans-Lobsters: 1 species Groups Introduced into United States
Each category represents a combination of a species introduced via a pathway. A single species can be introduced by more than one pathway and may therefore be counted more than once.
shipping: 489 species shipping: 489 species unknown: 419 species unknown: 419 species stocked: 360 species stocked: 360 species hitch hiker: 241 species hitch hiker: 241 species aquarium release: 239 species aquarium release: 239 species bait release: 176 species bait release: 176 species aquaculture: 98 species aquaculture: 98 species canal: 94 species canal: 94 species dispersed: 92 species dispersed: 92 species pet release: 88 species pet release: 88 species released: 69 species released: 69 species planted: 49 species planted: 49 species escaped captivity: 26 species escaped captivity: 26 species accidental: 14 species accidental: 14 species other: 13 species other: 13 species released lab animals: 9 species released lab animals: 9 species released food fish: 9 species released food fish: 9 species hybridized: 9 species hybridized: 9 species Introduction Pathways
This graph shows the cumulative number of species introduced in 50-year increments. The bars are further divided to show those that are native transplants (native to a portion of the US but moved to a non-native area in the US) and exotic transplants (not native to the US).
up to present & Unknown: 39 species up to present & Cryptogenic: 76 species up to present & Hybrid: 34 species up to present & Exotic to US: 812 species up to present & Native Transplants: 631 species up to 2000 & Unknown: 39 species up to 2000 & Cryptogenic: 72 species up to 2000 & Hybrid: 32 species up to 2000 & Exotic to US: 744 species up to 2000 & Native Transplants: 598 species up to 1950 & Unknown: 3 species up to 1950 & Cryptogenic: 5 species up to 1950 & Hybrid: 4 species up to 1950 & Exotic to US: 237 species up to 1950 & Native Transplants: 257 species up to 1900 & Unknown: 0 species up to 1900 & Cryptogenic: 0 species up to 1900 & Hybrid: 0 species up to 1900 & Exotic to US: 89 species up to 1900 & Native Transplants: 101 species Native/Exotic Introductions over time
This analysis includes all species introduced into either freshwater or marine areas, including those that did not become established. Estuarine species are included as marine.
Freshwater: 1147 species Freshwater: 1147 species Marine: 546 species Marine: 546 species Brackish: 77 species Brackish: 77 species Marine Vs Freshwater Of Introduce times in United States
This graph is based on all taxa introduced into the region or states at any time. They include species that did not become established.
up to present & Marine: 77 species up to present & Brackish: 546 species up to present & Freshwater: 1147 species up to 2000 & Marine: 41 species up to 2000 & Brackish: 501 species up to 2000 & Freshwater: 1065 species up to 1950 & Marine: 6 species up to 1950 & Brackish: 142 species up to 1950 & Freshwater: 368 species up to 1900 & Marine: 3 species up to 1900 & Brackish: 31 species up to 1900 & Freshwater: 158 species Freshwater/Marine Introductions over time
This graph represents all species and all pathways and includes species that did not become established.
North America: 641 species North America: 641 species Asia: 276 species Asia: 276 species Unknown: 180 species Unknown: 180 species South America: 161 species South America: 161 species Eurasia: 91 species Eurasia: 91 species Europe: 71 species Europe: 71 species Indo-Pacific: 56 species Indo-Pacific: 56 species Africa: 51 species Africa: 51 species Caribbean: 18 species Caribbean: 18 species Australia: 13 species Australia: 13 species Pacific Ocean: 6 species Pacific Ocean: 6 species South and Central America: 5 species South and Central America: 5 species North and South America: 4 species North and South America: 4 species Europe and Africa: 3 species Europe and Africa: 3 species AustralAsia: 3 species AustralAsia: 3 species Central America: 3 species Central America: 3 species Cosmopolitan: 3 species Cosmopolitan: 3 species Asia and Africa: 2 species Asia and Africa: 2 species Atlantic and Pacific: 1 species Atlantic and Pacific: 1 species North and Central America: 1 species North and Central America: 1 species Northwest Pacific: 1 species Northwest Pacific: 1 species Southeast Asia: 1 species Southeast Asia: 1 species Southwest Pacific: 1 species Southwest Pacific: 1 species Origin of Introduced Species in United States
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