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: 1023 species up to 2000: 911 species up to 1950: 290 species up to 1900: 116 species up to present: 1023 species up to 2000: 911 species up to 1950: 290 species up to 1900: 116 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: 517 species Native Transplants: 517 species Exotic to US: 472 species Exotic to US: 472 species Hybrid: 31 species Hybrid: 31 species Unknown: 3 species Unknown: 3 species Cryptogenic: 1 species Cryptogenic: 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: 692 species Fishes: 692 species Amphibians-Frogs: 50 species Amphibians-Frogs: 50 species Reptiles-Turtles: 45 species Reptiles-Turtles: 45 species Mollusks-Gastropods: 44 species Mollusks-Gastropods: 44 species Crustaceans-Crayfish: 31 species Crustaceans-Crayfish: 31 species Crustaceans-Copepods: 30 species Crustaceans-Copepods: 30 species Mollusks-Bivalves: 22 species Mollusks-Bivalves: 22 species Plants: 15 species Plants: 15 species Amphibians-Salamanders: 14 species Amphibians-Salamanders: 14 species Crustaceans-Shrimp: 13 species Crustaceans-Shrimp: 13 species Reptiles-Snakes: 12 species Reptiles-Snakes: 12 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 Reptiles-Lizards: 1 species Reptiles-Lizards: 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: 323 species stocked: 323 species unknown: 277 species unknown: 277 species aquarium release: 234 species aquarium release: 234 species bait release: 190 species bait release: 190 species hitch hiker: 148 species hitch hiker: 148 species canal: 102 species canal: 102 species aquaculture: 98 species aquaculture: 98 species pet release: 85 species pet release: 85 species shipping: 85 species shipping: 85 species dispersed: 53 species dispersed: 53 species released: 41 species released: 41 species escaped captivity: 21 species escaped captivity: 21 species hybridized: 10 species hybridized: 10 species planted: 8 species planted: 8 species released lab animals: 8 species released lab animals: 8 species other: 7 species other: 7 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: 3 species up to present & Cryptogenic: 1 species up to present & Hybrid: 31 species up to present & Exotic to US: 472 species up to present & Native Transplants: 517 species up to 2000 & Unknown: 3 species up to 2000 & Cryptogenic: 1 species up to 2000 & Hybrid: 28 species up to 2000 & Exotic to US: 394 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: 86 species up to 1950 & Native Transplants: 203 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: 39 species up to 1900 & Native Transplants: 78 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: 953 species Freshwater: 953 species Marine: 134 species Marine: 134 species Brackish: 57 species Brackish: 57 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: 57 species up to present & Brackish: 134 species up to present & Freshwater: 953 species up to 2000 & Marine: 31 species up to 2000 & Brackish: 94 species up to 2000 & Freshwater: 863 species up to 1950 & Marine: 2 species up to 1950 & Brackish: 15 species up to 1950 & Freshwater: 284 species up to 1900 & Marine: 1 species up to 1900 & Brackish: 3 species up to 1900 & Freshwater: 115 species Freshwater/Marine Introductions over time
This graph represents all species and all pathways and includes species that did not become established.
North America: 541 species North America: 541 species South America: 138 species South America: 138 species Asia: 131 species Asia: 131 species Indo-Pacific: 62 species Indo-Pacific: 62 species Africa: 44 species Africa: 44 species Eurasia: 35 species Eurasia: 35 species Europe: 23 species Europe: 23 species Central America: 9 species Central America: 9 species Caribbean: 8 species Caribbean: 8 species Unknown: 8 species Unknown: 8 species South and Central America: 6 species South and Central America: 6 species Australia: 6 species Australia: 6 species Europe and Africa: 2 species Europe and Africa: 2 species Southwest Pacific: 2 species Southwest Pacific: 2 species North and Central America: 2 species North and Central America: 2 species North and South America: 2 species North and South America: 2 species Northwest Pacific: 2 species Northwest Pacific: 2 species Pacific Ocean: 1 species Pacific Ocean: 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. [2016]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [6/26/2016].

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