freshwater
Chub
Squalius cephalus
Elongated, slightly rounded body with large scales that often have a dark border, giving a cross-hatched appearance. It has a broad, rounded head, a terminal mouth, and distinct reddish or orange pelvic and anal fins, while the dorsal and caudal fins are typically darker or greyish.
- Habitat
- Found in medium to large lowland rivers, slow-flowing st…
- Size & weight
- Typically ranges from 20 to 40 cm in length, with a comm…
- Diet
- Omnivorous and highly opportunistic.…
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Physical characteristics
Elongated, slightly rounded body with large scales that often have a dark border, giving a cross-hatched appearance. It has a broad, rounded head, a terminal mouth, and distinct reddish or orange pelvic and anal fins, while the dorsal and caudal fins are typically darker or greyish.
Habitat & distribution
Found in medium to large lowland rivers, slow-flowing streams, canals, and sometimes well-vegetated lakes or reservoirs. Prefers clear to moderately turbid waters with a gravelly or sandy substrate.
Behavior
Generally wary and active during the day. Younger individuals form small loose shoals, whereas older, larger specimens tend to become solitary and occupy specific territories or favored resting spots.
Diet
Omnivorous and highly opportunistic. Feeds on aquatic and terrestrial insects, crustaceans, mollusks, worms, small fish, algae, and plant material, particularly relying on surface insects during warmer months.
Reproduction
Spawns in the spring (typically April to June) when water temperatures rise. Females deposit adhesive eggs over shallow, gravelly riffes in fast-flowing water, where they attach to stones or vegetation.
Ecological role
Acts as an opportunistic predator and scavenger in freshwater ecosystems, helping to control populations of smaller aquatic organisms and invertebrates while serving as prey for larger piscivorous fish and birds.
Similar species
Dace (Leuciscus leuciscus) and Ide (Leuciscus idus). Dace are generally smaller with a more slender body and a smaller, inferior mouth. Ide have a deeper body, smaller scales, and yellowish-red fins.
Identification tips
Look for the large, prominent scales with dark edges, a thickset body, and reddish-orange lower fins combined with a large mouth extending beneath the eye.
Interesting facts
Chubs are exceptionally adaptable and can tolerate varying water qualities, sometimes surviving in degraded urban waterways where other sensitive fish species perish.