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: 969 species up to 2000: 875 species up to 1950: 273 species up to 1900: 104 species up to present: 969 species up to 2000: 875 species up to 1950: 273 species up to 1900: 104 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: 498 species Native Transplants: 498 species Exotic to US: 438 species Exotic to US: 438 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: 669 species Fishes: 669 species Amphibians-Frogs: 49 species Amphibians-Frogs: 49 species Reptiles-Turtles: 45 species Reptiles-Turtles: 45 species Mollusks-Gastropods: 42 species Mollusks-Gastropods: 42 species Crustaceans-Copepods: 29 species Crustaceans-Copepods: 29 species Crustaceans-Crayfish: 29 species Crustaceans-Crayfish: 29 species Mollusks-Bivalves: 21 species Mollusks-Bivalves: 21 species Amphibians-Salamanders: 13 species Amphibians-Salamanders: 13 species Crustaceans-Shrimp: 11 species Crustaceans-Shrimp: 11 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 Mammals: 6 species Mammals: 6 species Crustaceans-Crabs: 5 species Crustaceans-Crabs: 5 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: 315 species stocked: 315 species unknown: 260 species unknown: 260 species aquarium release: 216 species aquarium release: 216 species bait release: 181 species bait release: 181 species hitch hiker: 127 species hitch hiker: 127 species aquaculture: 92 species aquaculture: 92 species canal: 91 species canal: 91 species pet release: 83 species pet release: 83 species shipping: 80 species shipping: 80 species dispersed: 44 species dispersed: 44 species released: 37 species released: 37 species escaped captivity: 24 species escaped captivity: 24 species released food fish: 9 species released food fish: 9 species hybridized: 9 species hybridized: 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: 438 species up to present & Native Transplants: 498 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: 371 species up to 2000 & Native Transplants: 473 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: 75 species up to 1950 & Native Transplants: 196 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: 30 species up to 1900 & Native Transplants: 74 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: 899 species Freshwater: 899 species Marine: 119 species Marine: 119 species Brackish: 48 species Brackish: 48 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: 48 species up to present & Brackish: 119 species up to present & Freshwater: 899 species up to 2000 & Marine: 28 species up to 2000 & Brackish: 83 species up to 2000 & Freshwater: 824 species up to 1950 & Marine: 2 species up to 1950 & Brackish: 10 species up to 1950 & Freshwater: 267 species up to 1900 & Marine: 1 species up to 1900 & Brackish: 1 species up to 1900 & Freshwater: 103 species Freshwater/Marine Introductions over time
This graph represents all species and all pathways and includes species that did not become established.
North America: 523 species North America: 523 species South America: 131 species South America: 131 species Asia: 119 species Asia: 119 species Indo-Pacific: 58 species Indo-Pacific: 58 species Africa: 44 species Africa: 44 species Eurasia: 30 species Eurasia: 30 species Europe: 21 species Europe: 21 species Caribbean: 8 species Caribbean: 8 species Australia: 6 species Australia: 6 species Unknown: 6 species Unknown: 6 species Central America: 5 species Central America: 5 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 Southeast Asia: 1 species Southeast Asia: 1 species Pacific Ocean: 1 species Pacific Ocean: 1 species Europe and Africa: 1 species Europe and 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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Take Pride in America logoU.S. Department of the Interior | U.S. Geological Survey
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. [2013]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [5/21/2013].

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