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Rainbow Trout
Oncorhynchus mykiss
1,054 observations
Brook Trout
Salvelinus fontinalis
1,015 observations
Rocky Mountain Cutthroat Trout
Oncorhynchus virginalis
838 observations
Brown Trout
Salmo trutta
791 observations
Bluegill
Lepomis macrochirus
408 observations
Largemouth Bass
Micropterus nigricans
327 observations
European Carp
Cyprinus carpio
316 observations
Creek Chub
Semotilus atromaculatus
309 observations
Green Sunfish
Lepomis cyanellus
253 observations
White Sucker
Catostomus commersonii
147 observations
Longnose Dace
Rhinichthys cataractae
136 observations
Fathead Minnow
Pimephales promelas
133 observations
Western Mosquitofish
Gambusia affinis
124 observations
Channel Catfish
Ictalurus punctatus
100 observations
Smallmouth Bass
Micropterus dolomieu
80 observations
Yellow Perch
Perca flavescens
78 observations
Black Crappie
Pomoxis nigromaculatus
65 observations
Rocky Mountain Cutbow
Oncorhynchus mykiss × virginalis
64 observations
American Gizzard Shad
Dorosoma cepedianum
60 observations
Longnose Sucker
Catostomus catostomus
58 observations
Walleye
Sander vitreus
52 observations
Tiger Trout
Salmo trutta × Salvelinus fontinalis
51 observations
Sockeye Salmon
Oncorhynchus nerka
48 observations
Northern Pike
Esox lucius
47 observations
Goldfish
Carassius auratus
47 observations
Brook Stickleback
Culaea inconstans
44 observations
Greengill Sunfish
Lepomis macrochirus × cyanellus
41 observations
Grass Carp
Ctenopharyngodon idella
40 observations
Black Bullhead
Ameiurus melas
39 observations
Mountain Sculpin
Cottus punctulatus
39 observations
Roundtail Chub
Gila robusta
37 observations
Lake Trout
Salvelinus namaycush
31 observations
Pumpkinseed
Lepomis gibbosus
25 observations
Northern Plains Killifish
Fundulus kansae
25 observations
Johnny Darter
Etheostoma nigrum
24 observations
Red Shiner
Cyprinella lutrensis
24 observations
Invasive
Arctic Grayling
Thymallus arcticus
21 observations
Speckled Dace
Rhinichthys osculus
21 observations
Golden Shiner
Notemigonus crysoleucas
20 observations
Plains Topminnow
Fundulus sciadicus
18 observations
Flannelmouth Sucker
Catostomus latipinnis
16 observations
Central Stoneroller
Campostoma anomalum
15 observations
Amur Carp
Cyprinus rubrofuscus
15 observations
Bluehead Sucker
Pantosteus discobolus
14 observations
Plains Sand Shiner
Miniellus missuriensis
14 observations
White Crappie
Pomoxis annularis
10 observations
Redear Sunfish
Lepomis microlophus
10 observations
Invasive
Tiger Muskellunge
Esox masquinongy × lucius
10 observations
Iowa Darter
Etheostoma exile
8 observations
Orangethroat Darter
Etheostoma spectabile
8 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 1,054 recorded observations.
- Some of the most commonly observed invasive fish in Colorado include:
- Arctic Grayling (Thymallus arcticus)
- Tiger Muskellunge (Esox masquinongy × lucius)