Danube bleak (Alburnus chalcoides)

Scientific name: Alburnus chalcoides G?ldenst?dt, 1772

Danube bleak (Alburnus chalcoides)

The Danube bleak (Alburnus chalcoides) is a freshwater fish of the family Cyprinidae. In the aquarium it needs water at 5–20°C (41–68°F).

Danube bleak care at a glance

Temperature
5–20°C (41–68°F)

Biology

Diagnosed from its congeners in Caspian and Black Sea basin by having the following characters: anal fin origin about 1? -2? scales behind last branched dorsal ray; lateral line with 54-65 + 4-5 scales; anal fin rays with 13-15? branched rays; 18-23 gill rakers; ventral keel exposed for 8-12 scales in front of anus (up to almost 80% of distance between anus and pelvic base); head length 20-24% SL; predorsal length 52-56% SL; caudal peduncle depth 1.9-2.4 times in its length; nuptial males with few, large tubercles; lacking dark midlateral stripe. Morphology is variable which has been considered to be an adaptation to different habitats, but data suggest that this is probably due to several species being confused under this species.

Source: FishBase, licensed CC BY-NC 4.0.

Species facts

Scientific name
Alburnus chalcoides
Family
Cyprinidae (Minnows or carps)
Order
Cypriniformes (Carps)
Class
Actinopterygii (Ray-finned fishes)
Maximum length
40.0
Common length
28
Environment
Freshwater; brackish; pelagic; potamodromous
Climate
Temperate
Distribution
Europe: Caspian (mostly western to southern coast, rarely found in Ural and Volga). Populations from Aral Sea basin might belong to this species. In Appendix III of the Bern Convention (protected fauna).
Conservation status (IUCN)
Least Concern (LC)
Threat to humans
Harmless
Uses
Fisheries: commercial; aquaculture: commercial
Resilience
Medium, minimum population doubling time 1.4 - 4.4 years (tm=2-5; tmax=9; K=0.10)

Sources

Taxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.

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