Description and characteristics
The roach (Rutilus rutilus) is a small-to-medium cyprinid with a deep, laterally compressed body. It has silvery scales, characteristic orange-red eyes and fins that may show reddish tints in mature specimens.
Habitat and distribution
The roach is one of the most widespread freshwater species of the Danube Delta, inhabiting lakes, branches, canals and flooded areas. It prefers waters with aquatic vegetation and muddy bottoms, being very adaptable.
Diet and behaviour
It is omnivorous, feeding on plankton, benthic invertebrates, insect larvae and vegetation. It forms dense schools that move seeking food and represent important prey for predators.
Reproduction
Spawning occurs in spring at 8–12°C, with females laying numerous eggs on vegetation and bottoms. The fry grow quickly and mature in 2–3 years.
Economic and ecological importance
The roach has an essential ecological role as a prey species, supporting populations of predatory fish. It is widely caught and used as bait or even eaten locally.
Threats and conservation
As an opportunistic and prolific species it is relatively resilient, though it can be affected by pollution and degradation of wetland habitats.
Fishing and legal minimum size
Roach is caught with rod, seine and small nets. In the table of minimum legal sizes, the roach (Rutilus rutilus) has a minimum legal size of 15 cm.
Conclusion
The roach is a cornerstone fish of the Danube Delta ecosystems, essential for the local food webs.