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Rainbow Trout
Oncorhynchus mykiss
1,136 observations
Brook Trout
Salvelinus fontinalis
1,129 observations
Rocky Mountain Cutthroat Trout
Oncorhynchus virginalis
954 observations
Brown Trout
Salmo trutta
870 observations
Bluegill
Lepomis macrochirus
460 observations
European Carp
Cyprinus carpio
378 observations
Largemouth Bass
Micropterus nigricans
366 observations
Creek Chub
Semotilus atromaculatus
343 observations
Green Sunfish
Lepomis cyanellus
291 observations
White Sucker
Catostomus commersonii
169 observations
Fathead Minnow
Pimephales promelas
159 observations
Longnose Dace
Rhinichthys cataractae
157 observations
Western Mosquitofish
Gambusia affinis
139 observations
Invasive
Arctic Grayling
Thymallus arcticus
109 observations
Channel Catfish
Ictalurus punctatus
103 observations
Smallmouth Bass
Micropterus dolomieu
93 observations
Speckled Dace
Rhinichthys osculus
88 observations
Yellow Perch
Perca flavescens
81 observations
Black Crappie
Pomoxis nigromaculatus
72 observations
Longnose Sucker
Catostomus catostomus
66 observations
Rocky Mountain Cutbow
Oncorhynchus mykiss × virginalis
64 observations
Tiger Trout
Salmo trutta × Salvelinus fontinalis
63 observations
American Gizzard Shad
Dorosoma cepedianum
62 observations
Walleye
Sander vitreus
59 observations
Brook Stickleback
Culaea inconstans
55 observations
Greengill Sunfish
Lepomis macrochirus × cyanellus
53 observations
Northern Pike
Esox lucius
51 observations
Sockeye Salmon
Oncorhynchus nerka
49 observations
Grass Carp
Ctenopharyngodon idella
49 observations
Goldfish
Carassius auratus
47 observations
Mountain Sculpin
Cottus punctulatus
47 observations
Black Bullhead
Ameiurus melas
41 observations
Roundtail Chub
Gila robusta
39 observations
Lake Trout
Salvelinus namaycush
33 observations
Northern Plains Killifish
Fundulus kansae
32 observations
Johnny Darter
Etheostoma nigrum
28 observations
Red Shiner
Cyprinella lutrensis
28 observations
Pumpkinseed
Lepomis gibbosus
27 observations
Amur Carp
Cyprinus rubrofuscus
25 observations
Plains Sand Shiner
Miniellus missuriensis
22 observations
Golden Shiner
Notemigonus crysoleucas
20 observations
Plains Topminnow
Fundulus sciadicus
20 observations
Central Stoneroller
Campostoma anomalum
16 observations
Flannelmouth Sucker
Catostomus latipinnis
16 observations
Bluehead Sucker
Pantosteus discobolus
14 observations
Redear Sunfish
Lepomis microlophus
13 observations
White × Striped Bass
Morone chrysops × saxatilis
13 observations
Mountain Whitefish
Prosopium williamsoni
12 observations
Invasive
Tiger Muskellunge
Esox masquinongy × lucius
12 observations
White Crappie
Pomoxis annularis
10 observations
Frequently Asked Questions
- The 10 most common fish in Colorado are:
- Rainbow Trout (Oncorhynchus mykiss)
- Brook Trout (Salvelinus fontinalis)
- Rocky Mountain Cutthroat Trout (Oncorhynchus virginalis)
- Brown Trout (Salmo trutta)
- Bluegill (Lepomis macrochirus)
- European Carp (Cyprinus carpio)
- Largemouth Bass (Micropterus nigricans)
- Creek Chub (Semotilus atromaculatus)
- Green Sunfish (Lepomis cyanellus)
- White Sucker (Catostomus commersonii)
- The most observed fish in Colorado is Rainbow Trout (Oncorhynchus mykiss), with 1,136 recorded observations.
- Some of the most commonly observed invasive fish in Colorado include:
- Arctic Grayling (Thymallus arcticus)
- Tiger Muskellunge (Esox masquinongy × lucius)
- Some of the most commonly observed native fish in Colorado include:
- Speckled Dace (Rhinichthys osculus)
- Longnose Sucker (Catostomus catostomus)
- Roundtail Chub (Gila robusta)
- Flannelmouth Sucker (Catostomus latipinnis)
- Bluehead Sucker (Pantosteus discobolus)