Modern problems of artificial reproduction of sturgeon in the Volga‐Caspian basin

Vasilyeva, L. M.; Рабазанов, Н. И.

doi:10.18470/1992-1098-2022-3-6-15

Cited by 5 publications

(6 citation statements)

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“…Stocking nevertheless remains an important tool to restore natural populations of migrating sturgeon to the Ural River, but hatcheries must be restructured to meet international standards for preservation of the diversity of the sturgeon gene pool and to raise young fish that are adapted to natural habitat conditions. This will require access to technologies to ensure that biological characteristics such as homing and spawning behavior are retained, that juveniles are of a viable weight before they are released [135,136], and that the production of juvenile sturgeon is balanced by species composition [137].…”

Section: Stockingmentioning

confidence: 99%

Re-Establishing Naturally Reproducing Sturgeon Populations in the Caspian Basin: A Wicked Problem in the Ural River

Pueppke,

Nurtazin,

Murzashev

et al. 2023

Water

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Although Eurasia’s Caspian basin once supported the world’s richest and most diverse complex of sturgeon species, recent human activities have decimated populations of these ecologically and economically important fish. All five anadromous Caspian sturgeon species are critically endangered, and the potamodromous sterlet is also threatened. The precipitous decline of these species is due to a combination of factors that includes illegal, unreported, and unregulated (IUU) fishing; destruction of feeding and spawning habitat; water pollution; and the environmental consequences of climate change. International efforts are currently underway to re-establish sustained naturally reproducing sturgeon populations in the basin. Here, we update and review the status of sturgeon in the Caspian Sea with emphasis on the northern basin and the inflowing Volga and Ural rivers. We then focus on efforts to restore sturgeon in the Ural, which originates in Russia and flows through Kazakhstan before entering the Caspian Sea. With nearly ideal hydrological conditions for sturgeon, the Ural is the basin’s sole remaining river that allows migrating sturgeon unimpeded access to potentially productive spawning grounds. The challenge of re-establishing sturgeon in the Ural River exhibits the classical characteristics of wicked problems: ambiguous definitions, changing assumptions and unanticipated consequences, tradeoffs and economic dependencies, an incomplete and contradictory knowledge base, and no straightforward pathway toward a final solution. This challenge is examined here for the first time from the perspective of its wicked dynamics, with consideration given to approaches that have proven effective elsewhere in resolving wicked environmental problems.

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Section: Stockingmentioning

confidence: 99%

Re-Establishing Naturally Reproducing Sturgeon Populations in the Caspian Basin: A Wicked Problem in the Ural River

Pueppke,

Nurtazin,

Murzashev

et al. 2023

Water

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“…This method is common where there are no fish of natural origin. Its major disadvantages are that the process of forming breeding flocks until maturity take up a lot of time, because sturgeon fish are late maturing (beluga matures at 18-20, Russian sturgeon at 16-17 and starry sturgeon at 10-12 years), and the second disadvantage is the possibility of inbreeding, which leads to non-viable offspring [7]. However, this method has the significant advantage of knowing the history of each specimen, which is well adapted to the artificial environment from the very first day.…”

Section: Artificial Reproduction Of Sturgeonmentioning

confidence: 99%

Russian sturgeon aquaculture in modern conditions

Vasilyeva¹,

Anokhina²,

Magzanova³

et al. 2022

The Caspian in the Digital Age

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Under the current conditions of valuable fish species depletion, sturgeon aquaculture is intended to solve two major problems, such as restoring natural stocks and saturating the consumer market with delicacy products. Artificial reproduction is the only feasible way of preserving the sturgeon gene pool in Russia’s water bodies, since natural reproduction has been reduced to zero. Commercial sturgeon farming addresses the needs of the consumer market in the context of the ban on commercial fishing. The article deals with the issues of the state and prospects of sturgeon aquaculture development.

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“…Основным компенсаторным механизмом восстановления ее запасов является искусственное воспроизводство. В условиях дефицита, а порой и отсутствия производителей естественных генераций особое значение приобретают продукционные стада, процессы их формирования, оптимального содержания и рациональной эксплуатации [3]. Их создание позволяет решать основную задачу по гарантированному обеспечению рыбоводных процессов по искусственному воспроизводству, в результате чего возможно сохранение биологического разнообразия осетровых видов рыб [4].…”

Section: Introductionunclassified

“…6, no. 3 стад возникают значительные сложности, т. к. они характеризуются рыбоводно-биологическими показателями ниже нормативных значений [6]. Все этапы длительного развития производителей происходят вне природной среды обитания, поэтому содержание ремонта и производителей белуги в непривычных для вида условиях не только меняет направленность обмена веществ, но и, в конечном счете, влияет на генеративную функцию самок; также наблюдаются признаки физиологического истощения рыб и видоизмененный биохимический состав ооцитов [7].…”

Section: Introductionunclassified

Characterization of the Beluga Breeding Practices at the Don Sturgeon Hatchery

Vorobyeva,

Gorbenko,

Sergeeva

et al. 2023

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The study conducted in 2022 has identified a lack of consistency in the results of the beluga artificial reproduction at the Don Sturgeon Hatchery (DSH). To obtain eggs, mostly the females born in 2001–2004 were used, out of which 31 females at age 18 reached their first maturity and one female at age 21 was a repeat spawner. The majority of first-spawning females produced eggs of low quality. During incubation, there was a substantial loss of fertilized eggs, and various anomalies of embryonic development were observed, which necessitated termination of the incubation of such eggs. The yield of one-day larvae from the eggs obtained from the first-spawning females and set for incubation was low, around 12 %. One of the reasons for the increased mortality rates and development anomalies in the larvae was low quality of the oocytes in the first-spawning individuals. A second-spawning female has shown satisfactory results; the fertilization rate was in line with the standard values, and no more than 17 % of the eggs manifested embryonic anomalies during their incubation. The yield of one-day larvae was 53.3 %. In total, 799 thousand one-day beluga larvae were obtained. The analysis of the cultivation practices at the Don Sturgeon Hatchery made it possible to identify the bottleneck points and critical junctures at some stages of the biotechnological process, as well as to give recommendations on improvement of the hatchery operation. An important prerequisite for obtaining good results is the physiological adequacy of beluga females, which is based, for the most part, on the living environment and feeding quality of the breeders and their replacement in the broodstock.

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Modern problems of artificial reproduction of sturgeon in the Volga‐Caspian basin

Cited by 5 publications

References 1 publication

Re-Establishing Naturally Reproducing Sturgeon Populations in the Caspian Basin: A Wicked Problem in the Ural River

Re-Establishing Naturally Reproducing Sturgeon Populations in the Caspian Basin: A Wicked Problem in the Ural River

Russian sturgeon aquaculture in modern conditions

Characterization of the Beluga Breeding Practices at the Don Sturgeon Hatchery

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