Fish

Most commonly observed introduced fish documented using iNaturalist by US state

16 states reported European Carp, Cyprinus carpio, as the most commonly observed introduced fish

12 states reported Bluegill, Lepomis macrochirus, as the most commonly observed introduced fish

7 states reported Rainbow Trout, Oncorhynchus mykiss, as the most commonly observed introduced fish

3 states reported Brown Trout, Salmo trutta, as the most commonly observed introduced fish

3 states reported Largemouth Bass, Micropterus salmoides, as the most commonly observed introduced fish

2 states reported Brook Trout, Salvelinus fontinalis, as the most commonly observed introduced fish

1 state reported Alaska Blackfish, Dallia pectoralis, as the most commonly observed introduced fish

1 state reported Peacock Grouper, Cephalopholis argus, as the most commonly observed introduced fish

1 state reported Mayan Cichlid, Mayaheros urophthalmus, as the most commonly observed introduced fish

1 state reported Round Goby, Neogobius melanostomus, as the most commonly observed introduced fish

1 state reported Smallmouth Bass, Micropterus dolomieu, as the most commonly observed introduced fish

1 state reported Threadfin Shad, Dorosoma petenense, as the most commonly observed introduced fish

1 state reported Western Mosquitofish, Gambusia affinis, as the most commonly observed introduced fish

1 state reported Yellow Perch, Perca flavescens, as the most commonly observed introduced fish

Top 10 most commonly observed fish in the US (reported on iNaturalist)

1. Bluegill, Lepomis macrochirus - Native to the US (but may be considered introduced in some states)

2. Largemouth Bass, Micropterus salmoides - Native to the US (but may be considered introduced in some states)

3. Green Sunfish, Lepomis cyanellus - Native to the US (but may be considered introduced in some states)

4. Rainbow Trout, Oncorhynchus mykiss - Native to the US (but may be considered introduced in some states)

5. Western Mosquitofish, Gambusia affinis - Native to the US (but may be considered introduced in some states)

6. European Carp, Cyprinus carpio - Introduced to the US

7. Smallmouth Bass, Micropterus dolomieu - Native to the US (but may be considered introduced in some states)

8. Channel Catfish, Ictalurus punctatus - Native to the US (but may be considered introduced in some states)

9. Redbreast Sunfish, Lepomis auritus - Native to the US (but may be considered introduced in some states)

10. Creek Chub, Semotilus atromaculatus - Native to the US (but may be considered introduced in some states)

(last updated November 2023)