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: 1175 species up to 2000: 1030 species up to 1950: 345 species up to 1900: 143 species up to present: 1175 species up to 2000: 1030 species up to 1950: 345 species up to 1900: 143 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: 577 species Exotic to US: 577 species Native Transplants: 558 species Native Transplants: 558 species Hybrid: 37 species Hybrid: 37 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: 709 species Fishes: 709 species Plants: 145 species Plants: 145 species Amphibians-Frogs: 50 species Amphibians-Frogs: 50 species Mollusks-Gastropods: 45 species Mollusks-Gastropods: 45 species Reptiles-Turtles: 45 species Reptiles-Turtles: 45 species Crustaceans-Crayfish: 31 species Crustaceans-Crayfish: 31 species Crustaceans-Copepods: 30 species Crustaceans-Copepods: 30 species Mollusks-Bivalves: 26 species Mollusks-Bivalves: 26 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 Mammals: 6 species Mammals: 6 species Crustaceans-Crabs: 5 species Crustaceans-Crabs: 5 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 Rotifers: 2 species Rotifers: 2 species Entoprocts: 1 species Entoprocts: 1 species Annelids-Hirundinea: 1 species Annelids-Hirundinea: 1 species Annelids-Oligochaetes: 1 species Annelids-Oligochaetes: 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.
unknown: 376 species unknown: 376 species stocked: 331 species stocked: 331 species aquarium release: 260 species aquarium release: 260 species hitch hiker: 206 species hitch hiker: 206 species bait release: 196 species bait release: 196 species canal: 117 species canal: 117 species aquaculture: 99 species aquaculture: 99 species shipping: 96 species shipping: 96 species dispersed: 95 species dispersed: 95 species pet release: 84 species pet release: 84 species released: 49 species released: 49 species escaped captivity: 48 species escaped captivity: 48 species planted: 35 species planted: 35 species hybridized: 13 species hybridized: 13 species released lab animals: 8 species released lab animals: 8 species other: 7 species other: 7 species released food fish: 7 species released food fish: 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: 37 species up to present & Exotic to US: 577 species up to present & Native Transplants: 558 species up to 2000 & Unknown: 3 species up to 2000 & Cryptogenic: 1 species up to 2000 & Hybrid: 32 species up to 2000 & Exotic to US: 472 species up to 2000 & Native Transplants: 523 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: 122 species up to 1950 & Native Transplants: 221 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: 54 species up to 1900 & Native Transplants: 89 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: 1098 species Freshwater: 1098 species Marine: 146 species Marine: 146 species Brackish: 87 species Brackish: 87 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: 87 species up to present & Brackish: 146 species up to present & Freshwater: 1098 species up to 2000 & Marine: 45 species up to 2000 & Brackish: 99 species up to 2000 & Freshwater: 979 species up to 1950 & Marine: 7 species up to 1950 & Brackish: 17 species up to 1950 & Freshwater: 334 species up to 1900 & Marine: 3 species up to 1900 & Brackish: 3 species up to 1900 & Freshwater: 140 species Freshwater/Marine Introductions over time
This graph represents all species and all pathways and includes species that did not become established.
North America: 575 species North America: 575 species Asia: 162 species Asia: 162 species South America: 134 species South America: 134 species Indo-Pacific: 68 species Indo-Pacific: 68 species Africa: 53 species Africa: 53 species Eurasia: 50 species Eurasia: 50 species Europe: 27 species Europe: 27 species South and Central America: 26 species South and Central America: 26 species North and Central America: 19 species North and Central America: 19 species Central America: 17 species Central America: 17 species Australia: 12 species Australia: 12 species Caribbean: 10 species Caribbean: 10 species Unknown: 8 species Unknown: 8 species AustralAsia: 4 species AustralAsia: 4 species Europe and Africa: 3 species Europe and Africa: 3 species Asia and Africa: 2 species Asia and Africa: 2 species Southwest Pacific: 2 species Southwest Pacific: 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 Origin of Introduced Species in United States

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URL: https://nas.er.usgs.gov
Page Contact Information: Pam Fuller - NAS Program (pfuller@usgs.gov)
Page Last Modified: Monday, April 24, 2017

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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. [2017]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [11/19/2017].

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