Bleak (Alburnus alburnus)
Current record: 4oz
Water: River Monnow, Monmouth
The bleak (Alburnus alburnus) is a small freshwater fish belonging to the Cyprinidae family, commonly found in rivers and lakes across Europe and parts of Asia. Recognized for its silver coloration and slender body, the bleak typically reaches lengths of 5 to 10 centimeters. Its name is derived from the Old Norse word "bleikr," meaning pale or shining, which accurately describes its appearance.
Bleak are schooling fish, often congregating in large groups near the water's surface. Their silver scales create a reflective effect, contributing to their collective shimmering appearance. Despite their modest size, bleaks play a vital role in aquatic ecosystems by forming a link in the food chain. They primarily feed on small invertebrates and plankton, contributing to the regulation of these populations and providing a food source for larger fish species.
Anglers often target bleak for recreational fishing, particularly with light tackle and small baits. Their abundance and cooperative nature make them an excellent species for novice anglers to practice their skills. Additionally, bleak are utilized as baitfish in certain regions, attracting larger predatory species.
Bleak are well-adapted to a variety of freshwater habitats, including slow-flowing rivers, lakes, and ponds. They can tolerate a range of water conditions, from clear to slightly turbid, and are known for their resilience to environmental changes. While they are not typically the focus of conservation efforts, maintaining the health of their habitats ensures the overall balance of aquatic ecosystems in which they reside.
Despite their unassuming appearance, the bleak's ecological importance and contribution to both recreational and commercial aspects of fishing highlight the significance of this small but integral member of the Cyprinidae family. Understanding the biology and behavior of bleak aids in sustainable management practices, ensuring the preservation of their populations and the health of freshwater environments.
The bleak has a flat, elongated body. The comparatively small mouth is directed upward, and the head is pointed. The long anal fin has 18–23 fin rays. The lateral line has been finished. The fins of the bleak are sharp and colourless, and it has a dazzling silvery appearance. Its largest size is approximately 25 cm (10 in).
The bleak is frequently mistaken for several other species in Europe. Even though the young bleak can be mistaken for young common bream and silver bream in England, the bleak's pointed, upward-turned mouth is already recognisable at these stages. The bodies of young roach and ruffe are broader, and their anal fins are shorter.