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The sterlet (Acipenser ruthenus) is a relatively small species of sturgeon from Eurasia native to large rivers that flow into the Black Sea, Azov Sea, and Caspian Sea, as well as rivers in Siberia as far east as Yenisei. Populations migrating between fresh and salt water (anadromous) have been extirpated.[1]Also known as Sterlet sturgeon.

Sterlet
Conservation status
Endangered  (IUCN 3.1)[1]
CITES Appendix II (CITES)[2]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Acipenseriformes
Family:	Acipenseridae
Genus:	Acipenser
Species:	A. ruthenus
Binomial name
Acipenser ruthenus Linnaeus, 1758
Range of A. ruthenus   Resident   Extinct
Synonyms[3][4]
List Acipenser pygmaeus Pallas 1814 non Reisinger 1830  ?Acipenser kostera Fitzinger 1832  ?Acipenser koster Gmelin 1774 nomen nudum Acipenser marsiglii Brandt 1833 Acipenser kamensis Lovetsky 1834 Acipenser gmelini Fitzinger 1836 Acipenser aleutensis Fitzinger 1836 Acipenser dubius Heckel 1836  ?Acipenser ruthenus var. leucotica Brandt 1853 Acipenser ruthenus var. grisescens Brandt 1853 Acipenser (Sterletus) kankreni Valenciennes ex Duméril 1870 Acipenser (Sterletus) lovetzkyi Duméril 1870 Sterledus ruthenus var. sibiricus Dybowski 1874 Acipenser jeniscensis Herzenstein 1895 Acipenser ruthenus var. albinea Brusina 1902 Acipenser ruthenus var. birostrata Brusina 1902 Acipenser ruthenus var. obtusirostra Brusina 1902 non Lovetsky 1834 Acipenser ruthenus var. septemcarinata Brusina 1902 Acipenser ruthenicus Brusina 1902 Acipenser sterlet Brusina 1902 Acipenser sterleta Güldenstädt 1772 Acipenser ruthenus var. albus Antipa 1909 Acipenser ruthenus var. erytraea Antipa 1909 Acipenser ruthenus var. brevirostris Antipa 1909 Acipenser ruthenus ruzskyi Johansen 1946 Acipenser ruthenus ruzskyi n. baschmakovae Johansen 1946 Acipenser kosterus Fitzinger 1832 Euacipenser ruthenus (Linnaeus 1758) Sterledus ruthenus sibiricus Dybowski 1874 Sterleta ruthena (Linnaeus 1758) Sterletae ruthena (Linnaeus 1758) Sterletus ruthenus (Linnaeus 1758)

Due to overfishing (for its flesh, caviar, and isinglass), pollution, and dams, the sterlet has declined throughout its native range and is considered vulnerable by the IUCN.[1] Restocking projects are ongoing, and it has been introduced to some regions outside its native range, but the latter have generally not become self-sustaining.[1] Today, the majority of the international trade involves sterlets from aquaculture.[1]

Physical appearance

This section does not cite any sources. (January 2021)

• The sterlet may reach 16 kg in weight and 100 to 125 cm in length, rarely exceeding a length of 90 cm.
• It is quite variable in coloration, but usually has a yellowish ventral side.
• It is distinguishable from other European species of sturgeons by the presence of a great number of whitish lateral scutes, fringed barbels, and an elongated and narrow snout, highly variable in length.

Feeding habits

The sterlet's main source of food is benthic organisms; they commonly feed on crustaceans, worms, and insect larvae.[5]

Life history

The sterlet commonly reaches the age of 22 to 25 years. Males reach sexual maturity at 3–7 years old and females at 4–12 years old. Spawning occurs from the middle of April to the beginning of June. Females may lay from 15,000–44,000 eggs, at water temperatures preferably 12–17 °C (54–63 °F).

As pond fish

Sterlets require relatively large ponds with good water conditions, and may get entangled in plants such as blanketweed. They may require special food such as sterlet sticks, as they are unable to digest the vegetable proteins usually found in commercial fish foods.^{[citation needed]}

As food

In Russia, it is held in high esteem on account of its excellent flesh, contributing also to the best kinds of caviar and isinglass.^{[citation needed]}

History in the Danube

The sterlet (Acipenser ruthenus in Linnaeus' classification) is the last of the five native sturgeon species inhabiting the Middle and Upper Danube River. Its population has dropped significantly, mainly due to the degradation of main habitats, spawning grounds and foraging grounds.[6]

References

На других языках

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- [en] Sterlet

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[es] Acipenser ruthenus

El esturión esterlete (Acipenser ruthenus) es una especie del género de peces acipenseriformes Acipenser que vive en aguas dulceacuícolas de Europa y Asia. Antaño contaba también con poblaciones en las que parte de su vida transcurría en el mar.

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[ru] Стерлядь

Сте́рлядь[1] (лат. Acipenser ruthenus) — рыба семейства осетровых, обитающая в крупных реках Европы, впадающих в Чёрное, Азовское и Каспийское моря, а также Сибири вплоть до Енисея на востоке. Проходные популяции, мигрировавшие между пресными и солёными водами, были полностью уничтожены. Включена в Красную книгу МСОП как «вымирающий вид»[2]; занесена в Приложение II CITES[3] и Красную книгу России[4]. Длина тела достигает 125 см, масса — до 16 кг. Вылов, как любительский, так и промышленный, в России запрещён во всём Волжско-Каспийском[5] и Азово-Черноморском рыбохозяйственных бассейнах[6][7] (как и всех видов осетровых). Лицензированный лов разрешен в некоторых реках Западной Сибири[8][9], а также в реках Северного рыбохозяйственного бассейна[10]. Объект аквакультуры.

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