freshwater
Common Roach
Rutilus rutilus
Streamlined, laterally compressed body with a silvery sheen, darker bluish-grey back, and distinctive bright red or orange pelvic and anal fins. It has moderate-sized scales and a terminal mouth.
- Habitat
- Found in slow-flowing rivers, streams, canals, lakes, an…
- Size & weight
- Typically ranges from 15 to 35 cm in length and weighs u…
- Diet
- Omnivorous, feeding on aquatic plants, algae, detritus,…
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Physical characteristics
Streamlined, laterally compressed body with a silvery sheen, darker bluish-grey back, and distinctive bright red or orange pelvic and anal fins. It has moderate-sized scales and a terminal mouth.
Habitat & distribution
Found in slow-flowing rivers, streams, canals, lakes, and ponds throughout Europe and western Asia, often preferring well-vegetated, nutrient-rich waters.
Behavior
Highly gregarious, forming large shoals for protection against predators, and is primarily active during daylight hours.
Diet
Omnivorous, feeding on aquatic plants, algae, detritus, small crustaceans, mollusks, and insect larvae.
Reproduction
Spawns in spring in shallow, weedy areas where females lay adhesive eggs on aquatic vegetation or submerged roots.
Ecological role
Acts as an important prey species for larger predatory fish and piscivorous birds, and contributes to nutrient cycling and grazing on benthic invertebrates and algae.
Similar species
Rudd (Scardinius erythrophthalmus), which has a more upturned mouth and keel along the belly, and Dace (Leuciscus leuciscus), which lacks bright red fins.
Identification tips
Look for the silvery body, prominent red-orange lower fins, and a rounded anal fin originating beneath or slightly behind the dorsal fin base.
Interesting facts
Roach are known to occasionally hybridize with other cyprinid species like bream and rudd when habitats overlap.