Alburnus alburnus (Linnaeus, 1758)

Common bleak
Alburnus_alburnus_01_compr Alburnus_alburnus_02_compr

Description 1

Small-sized species that usually reaches 15 cm, with a maximum size of 25 cm. Long and laterally compressed body. Dorsal fin located closer to the beginning of the caudal fin than the snout. Superior mouth. Long and narrow caudal panduncle. Short dorsal fin, with radial nerves and a long anal fin, with 16-19 Large scales, 47-52 in a lateral line.

Biology 1

Sexual maturity from the first year, preferably at 2. Spawns from November to May on seaweed or gravel. High fertility rate, with layings of 100-2,000 eggs thus favouring existence in high densities. Voracious omnivore, quite varied in what it feeds upon, from zooplankton to crustaceans and insects and even small fish.

Habitat 1

Species introduced to rivers and reservoirs, easily adaptable to new conditions. Prefers to occupy the surface areas of the water column, where it feeds, creating shoals. Optimum temperature of water 18-20oC, can tolerate up to 30. Prefers clear, well-oxygenated waters with some current.

Sources 1

Spanish Catalogue of Exotic Invasive Species, Altas y Libro Rojo de los Peces Continentales de España [Atlas and Red Book of Continental Fish of Spain].

Spanish Catalogue of Exotic Invasive Species - CrustaceansSpanish Catalogue of Exotic Invasive Species - Fishes 1

http://www.magrama.gob.es/es/biodiversidad/temas/conservacion-de-especies/especies-exoticas-invasoras/ce_eei_peces.aspx

Fuentes y Créditos

  1. Adaptado por INVASORES - administrador de un trabajo de (c) cartotragsatec, algunos derechos reservados (CC BY), http://natusfera.gbif.es/guide_taxa/41

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