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: 1202 species up to 2000: 1055 species up to 1950: 366 species up to 1900: 152 species up to present: 1202 species up to 2000: 1055 species up to 1950: 366 species up to 1900: 152 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: 584 species Exotic to US: 584 species Native Transplants: 573 species Native Transplants: 573 species Hybrid: 37 species Hybrid: 37 species Unknown: 4 species Unknown: 4 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: 714 species Fishes: 714 species Plants: 162 species Plants: 162 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: 32 species Crustaceans-Crayfish: 32 species Crustaceans-Copepods: 31 species Crustaceans-Copepods: 31 species Mollusks-Bivalves: 26 species Mollusks-Bivalves: 26 species Amphibians-Salamanders: 15 species Amphibians-Salamanders: 15 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 Platyhelminthes: 1 species Platyhelminthes: 1 species Entoprocts: 1 species Entoprocts: 1 species Crustaceans-Barnacles: 1 species Crustaceans-Barnacles: 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: 390 species unknown: 390 species stocked: 333 species stocked: 333 species aquarium release: 260 species aquarium release: 260 species hitch hiker: 216 species hitch hiker: 216 species bait release: 202 species bait release: 202 species canal: 121 species canal: 121 species dispersed: 109 species dispersed: 109 species aquaculture: 102 species aquaculture: 102 species shipping: 101 species shipping: 101 species pet release: 84 species pet release: 84 species escaped captivity: 53 species escaped captivity: 53 species released: 51 species released: 51 species planted: 38 species planted: 38 species hybridized: 13 species hybridized: 13 species released food fish: 8 species released food fish: 8 species released lab animals: 8 species released lab animals: 8 species other: 7 species other: 7 species accidental: 2 species accidental: 2 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: 4 species up to present & Cryptogenic: 1 species up to present & Hybrid: 37 species up to present & Exotic to US: 584 species up to present & Native Transplants: 573 species up to 2000 & Unknown: 4 species up to 2000 & Cryptogenic: 1 species up to 2000 & Hybrid: 34 species up to 2000 & Exotic to US: 479 species up to 2000 & Native Transplants: 536 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: 134 species up to 1950 & Native Transplants: 231 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: 60 species up to 1900 & Native Transplants: 92 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: 1124 species Freshwater: 1124 species Marine: 146 species Marine: 146 species Brackish: 90 species Brackish: 90 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: 90 species up to present & Brackish: 146 species up to present & Freshwater: 1124 species up to 2000 & Marine: 47 species up to 2000 & Brackish: 98 species up to 2000 & Freshwater: 1003 species up to 1950 & Marine: 9 species up to 1950 & Brackish: 17 species up to 1950 & Freshwater: 354 species up to 1900 & Marine: 3 species up to 1900 & Brackish: 3 species up to 1900 & Freshwater: 149 species Freshwater/Marine Introductions over time
This graph represents all species and all pathways and includes species that did not become established.
North America: 584 species North America: 584 species Asia: 164 species Asia: 164 species South America: 136 species South America: 136 species Indo-Pacific: 68 species Indo-Pacific: 68 species Eurasia: 56 species Eurasia: 56 species Africa: 53 species Africa: 53 species Europe: 27 species Europe: 27 species South and Central America: 25 species South and Central America: 25 species North and Central America: 23 species North and Central America: 23 species Central America: 17 species Central America: 17 species Australia: 12 species Australia: 12 species Caribbean: 10 species Caribbean: 10 species Unknown: 10 species Unknown: 10 species AustralAsia: 4 species AustralAsia: 4 species Europe and Africa: 3 species Europe and Africa: 3 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: 2 species Pacific Ocean: 2 species Asia and Africa: 2 species Asia and Africa: 2 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: Thursday, January 26, 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. [2018]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [5/25/2018].

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