Gymnocephalus baloni Holcík & Hensel, 1974
Danube ruffe
Gymnocephalus baloni
photo by Otel, V.

Family:  Percidae (Perches), subfamily: Percinae
Max. size:  15 cm SL (male/unsexed)
Environment:  benthopelagic; freshwater; pH range: 6.80000019073486 - 7.80000019073486; dH range: 10 - 20
Distribution:  Europe: Danube (from delta to Germany) and Dniepr (from delta to Kiev) drainages; expected in Dniestr.
Diagnosis:  Dorsal spines (total): 14-16. Distinguished uniquely from its congeners by its body depth, 27-30% SL. Differs further from other species of the genus by the combination of the following characters: flank grey with a few large, irregular, dark blotches; and dorsal fin with 14-16 spines (Ref. 59043).
Biology:  Inhabits open sandy and muddy bottom in backwaters and large rivers with moderate current. Undertake migration from river mainstreams to backwaters to spawn. Nocturnal, feeding on small invertebrates (Ref. 59043).
IUCN Red List Status: Least Concern (LC); Date assessed: 05 March 2010 Ref. (130435)
Threat to humans:  harmless


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