Habitat and Ecology
Moderate to fast-flowing large to medium sized rivers with rock or gravel bottom. Spawns in fast-flowing water on shallow gravel beds often in small tributaries. May show a strong size related longitudinal distribution in smaller rivers, with adults inhabiting more upper river stretches.
Lives up to 12 years. Spawns for the first time at 4-5 years. May migrates some tens of km to spawning sites, which are often situated in tributaries, but which it does not inhabit in summer. Spawns in March-May when temperature reaches 12°C. Males form large aggregations, each male defending a small territory. Females spawn only once a year and, in some populations, during a very short period (3-5 days). Females deposit the sticky eggs into excavations made in gravel. Feeding larvae live along shores. Larvae live below surface. Early juveniles are benthic and inhabit very shallow shoreline habitats. When growing, they leave the shores for faster-flowing waters. Recruitment is closely related to high spring temperature, absence of spring floods and available shallow-water habitats along shores. Juveniles overwinter in backwaters or in cavities along shores. Adults form dense swarms during winter in lower parts of rivers. Larvae and early juveniles with superior mouth feed on small invertebrates. Larger juveniles and adults, which have inferior mouth, feed on benthic diatoms and detritus cleaned up from hard substrate in habitats with strong current.
Life History and Behavior
Molecular Biology and Genetics
Barcode data: Chondrostoma nasus
Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.
See the BOLD taxonomy browser for more complete information about this specimen and other sequences.
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Download FASTA File
Statistics of barcoding coverage: Chondrostoma nasus
Public Records: 26
Specimens with Barcodes: 32
Species With Barcodes: 1
IUCN Red List Assessment
Red List Category
Red List Criteria
European Union 27 = LC. Same rationale as above.
- 2008Least Concern(IUCN 2008)
- 2008Least Concern
Relevance to Humans and Ecosystems
The nase is found naturally in drainages of the Black Sea (Danube, Dniestr, Southern Bug, Dniepr), the southern Baltic Sea (Nieman, Odra, Vistula) and the southern North Sea (to Meuse in the west). Moreover it has been introduced to the Rhône, Loire, Hérault, and Soca (Italy, Slovenia) drainages. It is a migratory fish.
The nase has a spindle shaped physique, with a blue-grey metallic-coloured scales and orange tail. It has relatively sharp lower lip. Generally, the fish range from 25 to 40 centimetres in length, and weigh about 1000 grams. However, specimens have been recorded up to 50 cm long and 1.5 kg in weight. The maximum recorded life span of the fish is 15 years.
This gregarious species is found in deep water with a fast current, often in the back waters of bridges or in rocky outcrops. It dwells near the bottom where it feeds on algae and other aquatic plants. Nase fish on the whole stay in shoals.
The nase is protected by the Convention on the Conservation of European Wildlife and Natural Habitats.
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