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Rainbow Trout
Oncorhynchus mykiss
1,102 observations
Brook Trout
Salvelinus fontinalis
1,059 observations
Rocky Mountain Cutthroat Trout
Oncorhynchus virginalis
865 observations
Brown Trout
Salmo trutta
815 observations
Bluegill
Lepomis macrochirus
419 observations
Largemouth Bass
Micropterus nigricans
345 observations
European Carp
Cyprinus carpio
334 observations
Creek Chub
Semotilus atromaculatus
329 observations
Green Sunfish
Lepomis cyanellus
270 observations
White Sucker
Catostomus commersonii
158 observations
Fathead Minnow
Pimephales promelas
144 observations
Longnose Dace
Rhinichthys cataractae
140 observations
Western Mosquitofish
Gambusia affinis
132 observations
Channel Catfish
Ictalurus punctatus
100 observations
Speckled Dace
Rhinichthys osculus
85 observations
Smallmouth Bass
Micropterus dolomieu
83 observations
Yellow Perch
Perca flavescens
79 observations
Black Crappie
Pomoxis nigromaculatus
69 observations
Rocky Mountain Cutbow
Oncorhynchus mykiss × virginalis
64 observations
American Gizzard Shad
Dorosoma cepedianum
61 observations
Longnose Sucker
Catostomus catostomus
59 observations
Walleye
Sander vitreus
58 observations
Tiger Trout
Salmo trutta × Salvelinus fontinalis
53 observations
Northern Pike
Esox lucius
49 observations
Sockeye Salmon
Oncorhynchus nerka
49 observations
Brook Stickleback
Culaea inconstans
48 observations
Goldfish
Carassius auratus
47 observations
Grass Carp
Ctenopharyngodon idella
46 observations
Greengill Sunfish
Lepomis macrochirus × cyanellus
43 observations
Mountain Sculpin
Cottus punctulatus
40 observations
Black Bullhead
Ameiurus melas
39 observations
Roundtail Chub
Gila robusta
37 observations
Lake Trout
Salvelinus namaycush
32 observations
Northern Plains Killifish
Fundulus kansae
29 observations
Red Shiner
Cyprinella lutrensis
27 observations
Pumpkinseed
Lepomis gibbosus
26 observations
Johnny Darter
Etheostoma nigrum
26 observations
Invasive
Arctic Grayling
Thymallus arcticus
23 observations
Amur Carp
Cyprinus rubrofuscus
22 observations
Golden Shiner
Notemigonus crysoleucas
20 observations
Plains Sand Shiner
Miniellus missuriensis
20 observations
Plains Topminnow
Fundulus sciadicus
18 observations
Central Stoneroller
Campostoma anomalum
16 observations
Flannelmouth Sucker
Catostomus latipinnis
16 observations
White × Striped Bass
Morone chrysops × saxatilis
13 observations
Bluehead Sucker
Pantosteus discobolus
13 observations
Redear Sunfish
Lepomis microlophus
11 observations
Invasive
Tiger Muskellunge
Esox masquinongy × lucius
11 observations
White Crappie
Pomoxis annularis
10 observations
Iowa Darter
Etheostoma exile
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)
- Largemouth Bass (Micropterus nigricans)
- European Carp (Cyprinus carpio)
- Creek Chub (Semotilus atromaculatus)
- Green Sunfish (Lepomis cyanellus)
- White Sucker (Catostomus commersonii)
- The most observed fish in Colorado is Rainbow Trout (Oncorhynchus mykiss), with 1,102 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)