freshwater
Creek Chub
Semotilus atromaculatus
Elongated, robust body with a somewhat flattened head and large scales. Dark olive to brownish-gray back, silvery sides, and a white belly. A distinct dark spot is typically present at the front base of the dorsal fin, and a dark bar may be seen behind the gill cover, especially in breeding males.
- Habitat
- Inhabits small, clear headwaters, streams, and creeks wi…
- Size & weight
- Typically ranges from 4 to 8 inches (10 to 20 cm) in len…
- Diet
- Omnivorous and opportunistic feeder, consuming aquatic a…
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Physical characteristics
Elongated, robust body with a somewhat flattened head and large scales. Dark olive to brownish-gray back, silvery sides, and a white belly. A distinct dark spot is typically present at the front base of the dorsal fin, and a dark bar may be seen behind the gill cover, especially in breeding males.
Habitat & distribution
Inhabits small, clear headwaters, streams, and creeks with gravel or rocky bottoms, often avoiding sluggish, muddy waters. Found throughout eastern and central North America.
Behavior
Active during the day, solitary or loosely grouped outside of the breeding season. Known for being bold and aggressive biters in freshwater streams.
Diet
Omnivorous and opportunistic feeder, consuming aquatic and terrestrial insects, crustaceans, small fish, and plant matter.
Reproduction
Spawns in spring in shallow running water. Males construct large nests by carrying pebbles in their mouths to form a ridge or mound. They defend these territories vigorously and spawn with multiple females over the gravel pit.
Ecological role
Acts as an important link in the aquatic food web, serving as prey for larger piscivorous fish and birds, while preying on aquatic insects and small organisms. Creek chubs also build large gravel nests that are often used by other minnow species for spawning.
Similar species
Fallfish (Semotilus corporalis), which lacks the prominent dark spot on the dorsal fin, and various shiner species which tend to be more laterally compressed and lack the robust head of the creek chub.
Identification tips
Look for the robust body, large mouth extending to beneath the eye, and the characteristic dark spot at the base of the front of the dorsal fin.
Interesting facts
Male creek chubs develop small, keratinized bumps called tubercles on their heads and fins during the breeding season to help defend territory and attract mates.