Reproductive Function of Female Sturgeon Fish of Natural and Artificial Generation

Vasilyeva, L. M.; Магзанова, Д. К.; Sudakova, Natalia; Anokhina, Adelya Zakirovna; Gutsulyak, Svetlana; Kukushkina, I. V.

doi:10.47612/978-985-880-000000-0-2022-37-8-33

Cited by 2 publications

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“…In recent decades, their combined average annual production has been about 7 million fry [128]. There was initial optimism that stable Ural sturgeon populations could be restored by rearing juveniles to a larger, more viable size prior to release [129][130][131], and this led to proposals to construct additional hatcheries and raise the annual production of juvenile fish to as much as 150 million [132]. The mortality of juveniles released from the existing hatcheries was nevertheless high, natural spawning populations could not be maintained, and as was the case in the Volga, an acute shortage of broodstock soon constrained the activities of the Ural hatcheries [133].…”

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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“…Bester are trophologically carnivorous, they eat molluscs, small crustaceans, worms, and insects [11]. For ichthyotrophological research, the standard quantitative-weight method was employed.…”

Section: Introductionmentioning

confidence: 99%

Ichthyotrophological and Ichthyopathological Analysis of Bester (Acipencer Nikoljukinii)

Shalgimbaуeva

2023

EJE

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The paper presents the results of ichthyotrophological and ichthyopathological studies of the besterhybrid, which is of a significant importance among sturgeon fish. The purpose of the research work is to study the food spectrum of bester, bred in the pond and to study the external environment influence on the fish.Sturgeon is a promising form of modern aquaculture. In addition, sturgeon fish currently undergo mass extinction and their population decline sharply every year, so the interest in their commercial breeding has increased. In 2001, four countries of the Caspian Sea -Kazakhstan, Turkmenistan, Azerbaijan, and Russia (except Iran) imposed a temporary ban on catching sturgeon. This ban was imposed by the UN requirement within the framework of CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora). The problem was solved by the breeding of besters which are hybrid species produced from mating male sterlet and female huso. To carry out research bester hybrid fish was delivered from the Halyk Balyk pond farm in 2021. The absolute length of the studied 15 fish ranged from 12.7 to 30.1 cm, and their maximum weight ranged from 11.38 to 110.4 g. Ichthyological, ichthyotrophological and ichthyopathological analysis was carried out during the study. Standard numerical-weight and special histological methods were used for the study. Ichthyotrophological studies revealed that the fullness index was higher than 30.75%00. The studies showed a high level of nutrients in the reservoir and the absence of negative external environment influence on fish.

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Reproductive Function of Female Sturgeon Fish of Natural and Artificial Generation

Cited by 2 publications

References 0 publications

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

Ichthyotrophological and Ichthyopathological Analysis of Bester (Acipencer Nikoljukinii)

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