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: 1050 species up to 2000: 930 species up to 1950: 307 species up to 1900: 126 species up to present: 1050 species up to 2000: 930 species up to 1950: 307 species up to 1900: 126 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: 527 species Native Transplants: 527 species Exotic to US: 488 species Exotic to US: 488 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: 698 species Fishes: 698 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 Plants: 35 species Plants: 35 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 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: 325 species stocked: 325 species unknown: 300 species unknown: 300 species aquarium release: 246 species aquarium release: 246 species bait release: 191 species bait release: 191 species hitch hiker: 162 species hitch hiker: 162 species canal: 103 species canal: 103 species aquaculture: 98 species aquaculture: 98 species shipping: 87 species shipping: 87 species pet release: 85 species pet release: 85 species dispersed: 63 species dispersed: 63 species released: 44 species released: 44 species escaped captivity: 27 species escaped captivity: 27 species planted: 14 species planted: 14 species hybridized: 10 species hybridized: 10 species released lab animals: 8 species released lab animals: 8 species other: 8 species other: 8 species released food fish: 3 species released food fish: 3 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: 488 species up to present & Native Transplants: 527 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: 404 species up to 2000 & Native Transplants: 494 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: 95 species up to 1950 & Native Transplants: 210 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: 42 species up to 1900 & Native Transplants: 84 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: 976 species Freshwater: 976 species Marine: 136 species Marine: 136 species Brackish: 64 species Brackish: 64 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: 64 species up to present & Brackish: 136 species up to present & Freshwater: 976 species up to 2000 & Marine: 37 species up to 2000 & Brackish: 95 species up to 2000 & Freshwater: 880 species up to 1950 & Marine: 3 species up to 1950 & Brackish: 16 species up to 1950 & Freshwater: 299 species up to 1900 & Marine: 1 species up to 1900 & Brackish: 3 species up to 1900 & Freshwater: 125 species Freshwater/Marine Introductions over time
This graph represents all species and all pathways and includes species that did not become established.
North America: 546 species North America: 546 species South America: 141 species South America: 141 species Asia: 130 species Asia: 130 species Indo-Pacific: 64 species Indo-Pacific: 64 species Africa: 45 species Africa: 45 species Eurasia: 38 species Eurasia: 38 species Europe: 24 species Europe: 24 species Central America: 10 species Central America: 10 species Australia: 9 species Australia: 9 species Caribbean: 9 species Caribbean: 9 species Unknown: 9 species Unknown: 9 species South and Central America: 7 species South and Central America: 7 species North and Central America: 6 species North and Central America: 6 species North and South America: 2 species North and South America: 2 species Northwest Pacific: 2 species Northwest Pacific: 2 species Southwest Pacific: 2 species Southwest Pacific: 2 species Asia and Africa: 2 species Asia and Africa: 2 species AustralAsia: 2 species AustralAsia: 2 species Europe and Africa: 2 species Europe and Africa: 2 species Pacific Ocean: 1 species Pacific Ocean: 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: Tuesday, September 20, 2016

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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 [9/25/2016].

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