Silver bream

The silver bream (Blicca bjoerkna) belongs to the family Cyprinidae and the order Cypriniformes. It is a common freshwater species widely distributed across European water bodies.

Physically, the species is characterized by a deep, laterally compressed body covered with large scales. The coloration typically shows a silvery-blue sheen with greyish fins.

The taxonomic key for identification is the presence of pharyngeal teeth arranged in two rows, which distinguishes it from the common bream (Abramis brama).

The silver bream prefers slow-moving or stagnant waters where aquatic vegetation is abundant, forming dense schools for protection and feeding.

Reproduction occurs in late spring and early summer. Females deposit adhesive eggs onto submerged vegetation, making the species highly dependent on the condition of aquatic plants.

In aquaculture and commercial fish farming, the silver bream is often classified as a weed species due to its high reproductive rate and competition for food resources.

By consuming large amounts of plankton, insect larvae, and benthic organisms, it competes with more valuable fish species, reducing overall farm productivity.

In irrigation systems or drainage canals, excessive populations may disrupt the established biological balance and affect water transparency.

The species may indirectly affect aquatic vegetation health through its spawning activities and intense foraging behavior in shallow littoral zones.

While not a direct agricultural pest for field crops, its impact on the water quality of agricultural ponds is a documented concern for farm management.

Effective population management is primarily achieved through commercial fishing and the targeted use of netting equipment to reduce biomass.

Biological control, involving the introduction of predatory fish such as zander or pike, is an effective strategy to keep silver bream populations in check.

Water level regulation in managed ponds during the spawning season can prevent the massive recruitment of young-of-the-year fish.

Continuous monitoring of species composition allows managers to detect and address population explosions of silver bream before they impact the ecosystem.

Mechanical maintenance of aquatic habitats, such as vegetation control, can reduce the available spawning substrates, thereby limiting the reproductive success of the species.