 The main Caspian Sea population has found ways of spawning below the dams.Overfishing and pollution in the Caspian Sea could impact on the Danube bleak but in 2008 the IUCN Red List of Threatened Species listed it as being of "Least concern".The Danube bleak feeds on small crustaceans, worms, molluscs, insect larvae, insects and small fish.