Description and characteristics
The rudd (Scardinus erythrophtalmus) is a small-to-medium cyprinid with an elongated, laterally compressed body covered with silvery scales. It stands out for its reddish eyes and reddish-tinted fins, which give it its name.
Habitat and distribution
It inhabits the freshwater and brackish waters of the Danube Delta — lakes, branches and canals, preferring calm, vegetated waters. It lives in schools near the surface.
Diet and behaviour
It feeds on plankton, insects, larvae, small invertebrates and vegetation. A schooling, active species, serving as prey for predatory fish.
Reproduction
Spawning occurs in spring, with females laying eggs on vegetation and bottoms. The fry grow quickly and mature within a few years.
Economic and ecological importance
The rudd has an ecological role as a prey species. Locally, it is caught for food or used as bait.
Threats and conservation
It is numerous and adaptable, affected mainly by pollution and degradation of aquatic habitats.
Fishing and legal minimum size
The rudd is caught with a rod and small nets. In the table of minimum legal sizes, the rudd (Scardinus erythrophtalmus) has a minimum legal size of 15 cm.
Conclusion
The rudd is a numerous schooling cyprinid, important for the ecological balance of the Danube Delta.