Blicca bjoerkna

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

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Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
ANIMALIA	CHORDATA	ACTINOPTERYGII	CYPRINIFORMES	CYPRINIDAE

Scientific Name:

Blicca bjoerkna

Species Authority:

(Linneaus, 1758)

Common Name/s:

English

–

Silver Bream

Synonym/s:

Abramis bjoerkna (Linneaus, 1758)

Blicca bioerkna Linneaus, 1758 [orth. error]

Assessment Information [top]

Red List Category & Criteria:

Least Concern ver 3.1

Year Assessed:

2008

Assessor/s

Freyhof, J. & Kottelat, M.

Evaluator/s:

Bogutskaya, N., & Smith, K. (IUCN Freshwater Biodiversity Unit)

Justification:
A widespread species with no known major widespread threats.

History:

1996

–

Lower Risk/least concern

Geographic Range [top]

Range Description:	North, Baltic, White, Black (south to Rioni drainage) and Caspian Sea basins, Atlantic basin southward to Adour drainage (France; possibly introduced southward of Loire) and Mediterranean basin in France (Hérault and Rhône drainages). In Aral, Marmara and Anatolian Black Sea basins west of Ankara. Naturally absent from Iberian Peninsula, Italy, Adriatic basin, Crimea, Great Britain (except southeast), Scandinavia north of Sundsvall (Sweden) and 65°N (Finland). Locally introduced in Spain, northeastern Italy. In France apparently introduced in small coastal drainages of Var.
Countries:	Native: Andorra; Armenia; Austria; Azerbaijan; Belarus; Belgium; Bosnia and Herzegovina; Bulgaria; Croatia; Czech Republic; Denmark; Estonia; Finland; France; Georgia; Germany; Hungary; Iran, Islamic Republic of; Italy; Kazakhstan; Latvia; Liechtenstein; Lithuania; Luxembourg; Macedonia, the former Yugoslav Republic of; Moldova; Montenegro; Netherlands; Norway; Poland; Romania; Russian Federation; Serbia; Slovakia; Slovenia; Spain; Sweden; Switzerland; Turkey; Turkmenistan; Ukraine; United Kingdom
Range Map:	(click map to view full version)

Population [top]

Population:	Abundant.
Population Trend:	Unknown

Habitat and Ecology [top]

Habitat and Ecology:	Habitat: A wide variety of shallow, warm lowland lakes and slow-flowing lower reaches of large rivers and canals. Often very abundant on bottom of large sandy rivers. Spawns along shores on submerged vegetation, roots or even on shallow gravel bottom. Biology: Predominantly nocturnal. Gregarious. Lives more than 10 years. Males reproduce for the first time at two years, females at three. Most individuals spawn 2-3 times per season, at intervals of about 10 days and spawn in more than one year. Spawns in May-July at temperatures above 15°C, in early morning. Eggs are sticky and larvae inhabit still water bodies. Feeds on benthic invertebrates. Often hybridizes with Vimba vimba. Most reported hybrids with Abramis brama in fact are A. brama with pharyngeal teeth 2,5-5,2 (vs. usually 5-5).
Systems:	Freshwater

Habitat and Ecology:

Habitat:
A wide variety of shallow, warm lowland lakes and slow-flowing lower reaches of large rivers and canals. Often very abundant on bottom of large sandy rivers. Spawns along shores on submerged vegetation, roots or even on shallow gravel bottom.

Biology:
Predominantly nocturnal. Gregarious. Lives more than 10 years. Males reproduce for the first time at two years, females at three. Most individuals spawn 2-3 times per season, at intervals of about 10 days and spawn in more than one year. Spawns in May-July at temperatures above 15°C, in early morning. Eggs are sticky and larvae inhabit still water bodies. Feeds on benthic invertebrates. Often hybridizes with Vimba vimba. Most reported hybrids with Abramis brama in fact are A. brama with pharyngeal teeth 2,5-5,2 (vs. usually 5-5).

Systems:

Freshwater

Threats [top]

Major Threat(s):	No major threats known.

Major Threat(s):

No major threats known.

Conservation Actions [top]

Conservation Actions:	No information.

Conservation Actions:

No information.

Citation:	Freyhof, J. & Kottelat, M. 2008. Blicca bjoerkna. In: IUCN 2009. IUCN Red List of Threatened Species. Version 2009.2. <www.iucnredlist.org>. Downloaded on 10 February 2010.
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