Description and characteristics
The chub (Leuciscus cephalus) is a robust cyprinid with an elongated, cylindrical body covered with large scales. It has a large, broad head, a terminal mouth and a grey-green back with silvery flanks.
Habitat and distribution
The chub prefers clear flowing waters of the Danube Delta — branches, canals and areas with moderate currents, finding shelter near banks and vegetation.
Diet and behaviour
It is an omnivorous, opportunistic species, feeding on invertebrates, insects, crustaceans, small fish and vegetation. It is active and agile, adapted to currents.
Reproduction
Spawning occurs in spring at 10–14°C, with females laying eggs on hard bottoms and vegetation. The fry are pelagic, then move toward the banks.
Economic and ecological importance
The chub has value for sport fishing, appreciated for its resistance on the hook. Ecologically, it controls invertebrate and small-fish populations.
Threats and conservation
It is sensitive to pollution and alteration of water courses. Protecting flowing habitats and respecting minimum sizes are important.
Fishing and legal minimum size
The chub is caught with a rod, especially with natural bait. In the table of minimum legal sizes, the chub (Leuciscus cephalus) has a minimum legal size of 25 cm.
Conclusion
The chub is an active, robust cyprinid characteristic of the flowing waters of the Danube Delta.