Alert System User Statistics



Total Users
1089

StateSubscribers
California253
New York205
Florida203
Oregon199
Washington192
Pennsylvania188
Michigan181
Idaho174
Texas174
Wisconsin172
Ohio168
Minnesota166
Illinois164
Nevada164
Louisiana160
Indiana157
Colorado151
Montana151
Alabama151
Maryland149
Wyoming147
Mississippi147
Georgia147
Virginia146
North Carolina144
Massachusetts144
New Jersey142
Utah141
New Hampshire139
Vermont138
Maine138
Arizona137
Connecticut136
West virginia135
Delaware134
Alaska134
Missouri134
Tennessee134
South Carolina134
Arkansas133
Iowa132
Kansas132
Oklahoma129
Kentucky127
Rhode Island127
New Mexico126
North Dakota122
South Dakota121
Hawaii120
Nebraska119
District of Columbia116
Puerto Rico96
GroupSubscribers
Fishes378
Mollusks-Bivalves331
Marine Fishes305
Mollusks-Gastropods268
Crustaceans-Crayfish260
Amphibians-Frogs224
Plants221
Mammals219
Crustaceans-Crabs213
Reptiles-Turtles210
Reptiles-Snakes209
Amphibians-Salamanders202
Crustaceans-Shrimp198
Mollusks-Cephalopods193
Reptiles-Crocodilians177
Crustaceans-Copepods173
Crustaceans-Amphipods171
Crustaceans-Cladocerans168
Crustaceans-Isopods165
Reptiles-Lizards164
Crustaceans-Mysids159
Crustaceans-Barnacles135
Coelenterates-Hydrozoans132
Annelids-Oligochaetes128
Entoprocts119
Coelenterates-Scyphozoan100
Bryozoans90
Mollusks-Nudibranchs81
Algae79
Rotifers77
Coelenterates-Anthozoan73
Tunicates69
Crustaceans-Lobsters65
Annelids-Hirundinea64
Annelids-Polychaetes59
Amphibians-Caecilians56
Platyhelminthes56
Sponges56
Crustaceans-Ostracods52
Ectoprocts47
Nebaliaceans43
Cumaceans43
Polyplacophors43
Nematodes23
Protozoans12
Viruses12
Birds6
Insects5
Bacteria3
SpeciesNameSubscribers
zebra mussel - Dreissena polymorpha 440
quagga mussel - Dreissena rostriformis 368
Northern Snakehead - Channa argus 337
Silver Carp - Hypophthalmichthys molitrix 298
Black Carp - Mylopharyngodon piceus 290
Bighead Carp - Hypophthalmichthys nobilis 289
Round Goby - Neogobius melanostomus 258
Ruffe - Gymnocephalus cernua 226
lionfish - Pterois volitans/miles 153
hydrilla - Hydrilla verticillata 128
Rusty Crayfish - Faxonius rusticus 118
Red Swamp Crayfish - Procambarus clarkii 118
wandering hydrilla - Hydrilla verticillata 108
whorled hydrilla - Hydrilla verticillata 105
common water - Eichhornia crassipes 101
starry stonewort - Nitellopsis obtusa 94
giant salvinia - Salvinia molesta 83
water chestnut - Trapa bispinosa 80
water chestnut - Trapa natans 79
Cuban Treefrog - Osteopilus septentrionalis 60
Golden Mussel - Limnoperna fortunei 42
New Zealand mudsnail - Potamopyrgus antipodarum 11
Eurasian watermilfoil - Myriophyllum spicatum 6
Grass Carp - Ctenopharyngodon idella 6
yellow floating - Nymphoides peltata 6
parrot feather - Myriophyllum aquaticum 5
flowering rush - Butomus umbellatus 5
Blue Catfish - Ictalurus furcatus 4
Brazilian waterweed - Egeria densa 4
marbled crayfish - Procambarus virginalis 4
green crab - Carcinus maenas 4
Australian redclaw crayfish - Cherax quadricarinatus 3
brittle waternymph - Najas minor 3
Chinese mysterysnail - Cipangopaludina chinensis 3
freshwater golden clam - Corbicula fluminea 3
red - Melanoides tuberculata 3
variable - Myriophyllum heterophyllum 3
Northern Pike - Esox lucius 2
Carolina fanwort - Cabomba caroliniana 2
channeled applesnail - Pomacea canaliculata 2
mosquito fern - Azolla pinnata 2
American white waterlily - Nymphaea odorata 2
Prussian carp - Carassius gibelio 2
American Bullfrog - Lithobates catesbeianus 2
Flathead Catfish - Pylodictis olivaris 2
Sea Lamprey - Petromyzon marinus 2
Japanese mysterysnail - Cipangopaludina japonica 2
Chinese mitten crab - Eriocheir sinensis 2
curly - Potamogeton crispus 2
axe - Xenostrobus securis 2
giant applesnail - Pomacea maculata 2
ranae - Hydrocharis morsus2
spiny waterflea - Bythotrephes longimanus 2
Virile Crayfish - Faxonius virilis 2
unidentified rams - Helisoma sp. 1
suckermouth catfish - Hypostomus sp. 1
Chinese pond mussel - Sinanodonta woodiana 1
White Perch - Morone americana 1
hybrid watermilfoil - Myriophyllum × hybridum 1
Cane Toad - Rhinella marina 1
Suckermouth Catfish - Hypostomus plecostomus 1
Regal Demoiselle - Neopomacentrus cyanomos 1
northern hydrilla - Hydrilla verticillata 1
Jaguar Guapote - Parachromis managuensis 1
red discus - Symphysodon discus 1
six petal water primrose - Ludwigia hexapetala 1
grassy arrowhead - Sagittaria graminea 1
Midas Cichlid - Amphilophus citrinellus 1
eastern happy - Astatotilapia calliptera 1
West Indian spongeplant - Limnobium laevigatum 1
waterwheel plant - Aldrovanda vesiculosa 1
Goldline Snakehead - Channa aurolineata 1
Arizona Treefrog - Dryophytes wrightorum 1
Western Mosquitofish - Gambusia affinis 1
red devil - Amphilophus labiatus 1
water milfoil - Myriophyllum sp. 1
White River crawfish - Procambarus acutus 1
Yellow Bass - Morone mississippiensis 1
anchored waterhyacinth - Eichhornia azurea 1
Eggers' nutrush - Scleria eggersiana 1
a calanoid copepod - Eurytemora affinis 1
Freshwater Tubenose Goby - Proterorhinus semilunaris 1
Brazilian water hyacinth - Eichhornia paniculata 1
crested floating - Nymphoides cristata 1
Freshwater Drum - Aplodinotus grunniens 1
East Asian river prawn - Macrobrachium nipponense 1
purple loosestrife - Lythrum salicaria 1
floating primrose - Ludwigia peploides 1
Eastern Mosquitofish - Gambusia holbrooki 1
Lowland Cichlid - Herichthys carpintis 1
tropical nutrush - Scleria microcarpa 1
Spotted Bass - Micropterus punctulatus 1
European ear snail - Radix auricularia 1
water lettuce - Pistia stratiotes 1
holly - Najas marina 1
mud bithynia - Bithynia tentaculata 1
bigeye lates - Lates mariae 1
Southern White River Crayfish - Procambarus zonangulus 1
Cuban bulrush - Cyperus blepharoleptos 1
- Caulerpa prolifera 1
Grass Carp (diploid) - Ctenopharyngodon idella 1
Rudd - Scardinius erythrophthalmus 1
Tanganyika lates - Lates angustifrons 1
Asian Swamp Eel - Monopterus albus 1
African Jewelfish - Hemichromis letourneuxi 1
Tench - Tinca tinca 1
floatingheart - Nymphoides sp. 1
Chanchita - Cichlasoma dimerus 1
Alabama Bass - Micropterus henshalli 1
common reed - Phragmites australis 1
fishhook waterflea - Cercopagis pengoi 1
cutleaf watermilfoil - Myriophyllum pinnatum 1
Nile perch - Lates niloticus 1
didymo - Didymosphenia geminata 1
Panther Grouper - Chromileptes altivelis 1
Threadfin Shad - Dorosoma petenense 1
cuchia - Ophichthys cuchia 1
Allegheny crayfish - Faxonius obscurus 1


Disclaimer:

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. [2026]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [5/16/2026].

Contact us if you are using data from this site for a publication to make sure the data are being used appropriately and for potential co-authorship if warranted.

For general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.