Common Roach

Physical Characteristics

Deep, laterally compressed body with silver-blue coloration on the sides and a white belly. Noted for its distinctive bright orange to red iris and orange-red pelvic and anal fins. The dorsal fin is positioned directly above the pelvic fins.

Habitat & Distribution

Widespread across Europe and Western Asia. Found in slow-flowing rivers, lakes, ponds, and brackish waters (such as the Baltic Sea). They prefer vegetated areas with soft substrates.

Size & Weight

Typically ranges from 15 to 35 cm in length and weighs between 200g and 500g. Maximum recorded size is approximately 50 cm and 1.8 kg.

Similar Looking Species

The Common Rudd (Scardinius erythrophthalmus) is very similar but can be distinguished by its more upturned mouth and the position of the dorsal fin, which is set further back than the pelvic fins. Ide (Leuciscus idus) have smaller scales and a more yellow eye.

Ecological Role

Functions as a generalist feeder consuming aquatic plants, insects, mollusks, and crustaceans. It serves as a vital prey species for larger piscivorous predators like Pike and Zander. Conservation status is currently 'Least Concern' (IUCN).

Identified on: 1/2/2026

Mode: Standard