NAS - Nonindigenous Aquatic Species

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: 983 species up to 2000: 885 species up to 1950: 275 species up to 1900: 106 species up to present: 983 species up to 2000: 885 species up to 1950: 275 species up to 1900: 106 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).
Native Transplants: 509 species Native Transplants: 509 species Exotic to US: 442 species Exotic to US: 442 species Hybrid: 30 species Hybrid: 30 species Cryptogenic: 1 species Cryptogenic: 1 species Unknown: 1 species Unknown: 1 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: 677 species Fishes: 677 species Amphibians-Frogs: 50 species Amphibians-Frogs: 50 species Reptiles-Turtles: 45 species Reptiles-Turtles: 45 species Mollusks-Gastropods: 43 species Mollusks-Gastropods: 43 species Crustaceans-Crayfish: 30 species Crustaceans-Crayfish: 30 species Crustaceans-Copepods: 29 species Crustaceans-Copepods: 29 species Mollusks-Bivalves: 22 species Mollusks-Bivalves: 22 species Amphibians-Salamanders: 13 species Amphibians-Salamanders: 13 species Crustaceans-Shrimp: 12 species Crustaceans-Shrimp: 12 species Reptiles-Snakes: 11 species Reptiles-Snakes: 11 species Crustaceans-Cladocerans: 9 species Crustaceans-Cladocerans: 9 species Crustaceans-Amphipods: 7 species Crustaceans-Amphipods: 7 species Reptiles-Crocodilians: 7 species Reptiles-Crocodilians: 7 species Crustaceans-Crabs: 6 species Crustaceans-Crabs: 6 species Mammals: 6 species Mammals: 6 species Bryozoans: 4 species Bryozoans: 4 species Crustaceans-Isopods: 3 species Crustaceans-Isopods: 3 species Crustaceans-Mysids: 3 species Crustaceans-Mysids: 3 species Mollusks-Cephalopods: 2 species Mollusks-Cephalopods: 2 species Coelenterates-Hydrozoans: 2 species Coelenterates-Hydrozoans: 2 species Annelids-Oligochaetes: 1 species Annelids-Oligochaetes: 1 species Entoprocts: 1 species Entoprocts: 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.
stocked: 317 species stocked: 317 species unknown: 265 species unknown: 265 species aquarium release: 215 species aquarium release: 215 species bait release: 184 species bait release: 184 species hitch hiker: 131 species hitch hiker: 131 species aquaculture: 93 species aquaculture: 93 species canal: 91 species canal: 91 species shipping: 83 species shipping: 83 species pet release: 83 species pet release: 83 species dispersed: 44 species dispersed: 44 species released: 38 species released: 38 species escaped captivity: 26 species escaped captivity: 26 species hybridized: 10 species hybridized: 10 species released food fish: 9 species released food fish: 9 species accidental: 8 species accidental: 8 species released lab animals: 8 species released lab animals: 8 species other: 8 species other: 8 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: 1 species up to present & Cryptogenic: 1 species up to present & Hybrid: 30 species up to present & Exotic to US: 442 species up to present & Native Transplants: 509 species up to 2000 & Unknown: 1 species up to 2000 & Cryptogenic: 1 species up to 2000 & Hybrid: 28 species up to 2000 & Exotic to US: 376 species up to 2000 & Native Transplants: 479 species up to 1950 & Unknown: 0 species up to 1950 & Cryptogenic: 0 species up to 1950 & Hybrid: 2 species up to 1950 & Exotic to US: 77 species up to 1950 & Native Transplants: 197 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: 32 species up to 1900 & Native Transplants: 75 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: 915 species Freshwater: 915 species Marine: 128 species Marine: 128 species Brackish: 49 species Brackish: 49 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: 49 species up to present & Brackish: 128 species up to present & Freshwater: 915 species up to 2000 & Marine: 28 species up to 2000 & Brackish: 92 species up to 2000 & Freshwater: 835 species up to 1950 & Marine: 2 species up to 1950 & Brackish: 15 species up to 1950 & Freshwater: 268 species up to 1900 & Marine: 1 species up to 1900 & Brackish: 3 species up to 1900 & Freshwater: 104 species Freshwater/Marine Introductions over time
This graph represents all species and all pathways and includes species that did not become established.
North America: 532 species North America: 532 species South America: 130 species South America: 130 species Asia: 123 species Asia: 123 species Indo-Pacific: 58 species Indo-Pacific: 58 species Africa: 43 species Africa: 43 species Eurasia: 30 species Eurasia: 30 species Europe: 22 species Europe: 22 species Caribbean: 8 species Caribbean: 8 species Central America: 6 species Central America: 6 species Australia: 6 species Australia: 6 species Unknown: 6 species Unknown: 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 Northwest Pacific: 2 species Northwest Pacific: 2 species North and Central America: 2 species North and Central America: 2 species Southwest Pacific: 2 species Southwest Pacific: 2 species Pacific Ocean: 1 species Pacific Ocean: 1 species Southeast Asia: 1 species Southeast Asia: 1 species Europe and Africa: 1 species Europe and Africa: 1 species  Africa : 1 species  Africa : 1 species Asia and Africa: 1 species Asia and Africa: 1 species AustralAsia: 1 species AustralAsia: 1 species Origin of Introduced Species in United States

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URL: http://nas.er.usgs.gov
Page Contact Information: Pam Fuller - NAS Program (pfuller@usgs.gov)
Page Last Modified: Monday, June 18, 2012

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The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2014]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [4/23/2014].

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