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Roundtail Chub

gila robusta

The Roundtail Chub (Gila robusta) is a large, minnow-like freshwater fish native to the sprawling, unpredictable waters of the Colorado River Basin. Despite being a member of the minnow family, they can grow to impressive sizes, acting as a crucial intermediate predator in their native desert river ecosystems. Known for their resilience, these fish have evolved to thrive in environments characterized by extreme fluctuations in water flow, temperature, and turbidity. Historically referred to as the 'Colorado River Trout' by early pioneers due to their sporty fight and size, the Roundtail Chub remains an iconic symbol of the American Southwest's aquatic heritage, although they now face significant challenges from habitat alteration and invasive species.

Habitat: Found in warm, rocky rivers and streams of the Colorado River Basin, typically preferring deep, slow-moving pools and eddies near boulders or overhanging vegetation.

Appearance

Roundtail Chubs feature a streamlined, thick-bodied profile with a slender caudal peduncle (the area just before the tail fin) and a deeply forked tail, built for navigating strong currents. Their coloration is typically olive-green to grey on the back, fading to silvery sides and a white belly. During the spawning season, adult males develop striking orange or red patches on their lower fins, cheeks, and belly. They possess a relatively large, terminal mouth without barbels and have small, finely textured scales.

KingdomAnimaliaPhylumChordataClassActinopterygiiOrderCypriniformesFamilyLeuciscidaeGenusGila

Roundtail Chub

Interesting facts

Early pioneers of the American Southwest often caught Roundtail Chubs for food, mistakenly calling them 'Colorado River Trout' because of their aggressive strike and fighting ability.

The Roundtail Chub can hybridize with closely related species like the Humpback Chub and Bonytail Chub, sometimes complicating conservation efforts.

They are broadcast spawners, meaning females release thousands of eggs over gravel beds into the current, leaving them completely unguarded to develop on their own.

Special abilities

Highly adapted to the extreme flood-and-drought cycles of desert rivers, able to find refuge during torrential floods and survive in isolated pools during severe droughts.

Possesses a deeply forked tail and streamlined body that allows for rapid bursts of speed to navigate turbulent rapids or evade predatory fish.

Able to seamlessly shift its diet based on seasonal availability, switching from aquatic insects to algae or small fish as river conditions change.

Measurements & details

Length: 25-45 cm
Weight: 0.5-1.5 kg
Lifespan: 7-10 years
Top Speed: 20 km/h
Clutch Size: 5000-40000
Incubation: 4-7 days
Migration Distance: 30 km

Diet & Feeding

An opportunistic feeder that consumes a wide variety of aquatic and terrestrial prey alongside plant matter.

Age differences: Juveniles feed primarily on small aquatic insects and algae, while adults incorporate more small fish and larger invertebrates into their diet.

Primary Foods

Aquatic insects
Small fish
Crustaceans
Algae
Terrestrial insects

Foraging Method

Foraging

Ecological connections

eaten by

Colorado Pikeminnow

Ptychocheilus lucius

Preyed upon by the native apex predator of the basin.

competitor

Brown Trout

Salmo trutta

Competes with and is preyed upon by non-native introduced sport fish.

hunts

Mayflies

Ephemeroptera

Feeds heavily on aquatic larvae found in the river substrate.

Traits

No trait badges are assigned for this object yet.

Also known as

No aliases listed yet.

Collections

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Safety

Danger

1/5 · Very low

No special safety notes yet.

Frequently Asked Questions

How to identify Roundtail Chub?

The easiest way to identify Roundtail Chub is to use the Snappit nature identifier app.

How long is Roundtail Chub?

25-45 cm

How much does Roundtail Chub weigh?

0.5-1.5 kg

How long does Roundtail Chub live?

7-10 years

How fast can Roundtail Chub move?

20 km/h

What does Roundtail Chub eat?

An opportunistic feeder that consumes a wide variety of aquatic and terrestrial prey alongside plant matter.

Where is Roundtail Chub usually found?

Found in warm, rocky rivers and streams of the Colorado River Basin, typically preferring deep, slow-moving pools and eddies near boulders or overhanging vegetation.

How does Roundtail Chub hunt?

Foraging