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: 1001 species up to 2000: 895 species up to 1950: 278 species up to 1900: 106 species up to present: 1001 species up to 2000: 895 species up to 1950: 278 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: 519 species Native Transplants: 519 species Exotic to US: 449 species Exotic to US: 449 species Hybrid: 31 species Hybrid: 31 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: 688 species Fishes: 688 species Amphibians-Frogs: 50 species Amphibians-Frogs: 50 species Reptiles-Turtles: 46 species Reptiles-Turtles: 46 species Mollusks-Gastropods: 44 species Mollusks-Gastropods: 44 species Crustaceans-Crayfish: 31 species Crustaceans-Crayfish: 31 species Crustaceans-Copepods: 29 species Crustaceans-Copepods: 29 species Mollusks-Bivalves: 22 species Mollusks-Bivalves: 22 species Crustaceans-Shrimp: 13 species Crustaceans-Shrimp: 13 species Amphibians-Salamanders: 13 species Amphibians-Salamanders: 13 species Reptiles-Snakes: 11 species Reptiles-Snakes: 11 species Crustaceans-Cladocerans: 9 species Crustaceans-Cladocerans: 9 species Crustaceans-Amphipods: 8 species Crustaceans-Amphipods: 8 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 Coelenterates-Hydrozoans: 3 species Coelenterates-Hydrozoans: 3 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 Entoprocts: 1 species Entoprocts: 1 species Annelids-Oligochaetes: 1 species Annelids-Oligochaetes: 1 species Rotifers: 1 species Rotifers: 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: 318 species stocked: 318 species unknown: 274 species unknown: 274 species aquarium release: 219 species aquarium release: 219 species bait release: 186 species bait release: 186 species hitch hiker: 132 species hitch hiker: 132 species aquaculture: 93 species aquaculture: 93 species canal: 91 species canal: 91 species pet release: 85 species pet release: 85 species shipping: 84 species shipping: 84 species dispersed: 45 species dispersed: 45 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: 31 species up to present & Exotic to US: 449 species up to present & Native Transplants: 519 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: 379 species up to 2000 & Native Transplants: 486 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: 200 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: 31 species up to 1900 & Native Transplants: 76 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: 933 species Freshwater: 933 species Marine: 129 species Marine: 129 species Brackish: 50 species Brackish: 50 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: 50 species up to present & Brackish: 129 species up to present & Freshwater: 933 species up to 2000 & Marine: 28 species up to 2000 & Brackish: 93 species up to 2000 & Freshwater: 845 species up to 1950 & Marine: 2 species up to 1950 & Brackish: 15 species up to 1950 & Freshwater: 271 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: 540 species North America: 540 species South America: 133 species South America: 133 species Asia: 124 species Asia: 124 species Indo-Pacific: 59 species Indo-Pacific: 59 species Africa: 43 species Africa: 43 species Eurasia: 31 species Eurasia: 31 species Europe: 23 species Europe: 23 species Caribbean: 8 species Caribbean: 8 species Unknown: 7 species Unknown: 7 species Central America: 6 species Central America: 6 species Australia: 6 species Australia: 6 species South and Central America: 6 species South and Central America: 6 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 Europe and Africa: 1 species Europe and Africa: 1 species Pacific Ocean: 1 species Pacific Ocean: 1 species Southeast Asia: 1 species Southeast Asia: 1 species Asia and Africa: 1 species Asia and Africa: 1 species AustralAsia: 1 species AustralAsia: 1 species  Africa : 1 species  Africa : 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 [12/19/2014].

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