Fish Database

Alburnus mandrensis

Mandras bleak (eng.), Mandras Seelaube (ger.), Briana (bg.)

© Jörg Freyhof

Distribution and Habitat - Bulgaria

Mandras bleak are endemic to the Lake Mandras drainage in Bulgaria. They use the impounded area of Lake Mandras for foraging (Kottelat & Freyhof 2007) but migrate into headwater tributaries to spawn in strong current over gravel. Suggested to be highly sensitive to hydropower development due to the blockage of migratory corridors to reach spawning grounds (Freyhof 2012). As the species is critically endangered and limited to this single drainage, any impact on these spawning grounds could bring the species to extinction.
At this time, there are no planned hydropower schemes listed in the Mandras catchment.
  • IUCN-Redlist Critically Endangered
  • EUR-HAB-DIR III
  • Bern Convention II
  • Hydropower Sensitivity High
  • Balkan Dam Threat * Low

* The assessment of Balkan Dam Threat is based on the loss of habitat that would occur if all or most of the planned hydropower schemes in the distribution range of the species were to be built. For more precise specification see Fish Study, page 8.