Present status of commercial stocks of sturgeons in the Caspian Sea basin

Khodorevskaya, Raissa P.; Dovgopol, Galina F.; Zhuravleva, Olga L.; Vlasenko, Anatolii D.

doi:10.1023/a:1007381418332

Cited by 66 publications

(10 citation statements)

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“…Intensive sea fishing with hook and line gear, which had been banned in 1914 but then reintroduced in the 1930s, briefly elevated sturgeon catches to between 20,500 and 22,130 tons [42]. World War II reduced landings to 3890-7610 tons [23,43], but they increased again after 1946 [41,44]. Black caviar was widely available in the USSR after the war (Figure 2), and its price was comparable to that of butter as recently as the 1950s and early 1960s (3, Nurtazin, unpublished observations).…”

Section: The Caspian Basin As An Environment For Sturgeonmentioning

confidence: 99%

“…The dams reduced the distance available for sturgeon migrations to just 550 km and prevented spawners from reaching most of their traditional, high-quality spawning grounds. A single obstruction, the Volgograd dam, blocked sturgeon from reaching 187 spawning sites in the upper reaches of the Volga and its tributaries-roughly 80% of the total along this historically productive river [44,45].…”

Section: The Caspian Basin As An Environment For Sturgeonmentioning

confidence: 99%

“…The results of these efforts have nevertheless been disappointing [48]. Fewer than 1% of sturgeon attempting to maneuver past the Volgograd dam, for example, were successful [49], and it was evident as early as 1967 that the natural reproduction of sturgeon along the Upper Volga was effectively zero [44,50,51].…”

Section: The Caspian Basin As An Environment For Sturgeonmentioning

confidence: 99%

“…Although substantial natural variability in the hydrological regime of the Ural River has always existed and never prevented high natural spawning activity, sturgeon reproduction has collapsed in recent years [1,44]. The migration of juvenile ship sturgeon was last detected in 2007, and that of Russian sturgeon and beluga were last detected in 2010.…”

Section: Habitatmentioning

confidence: 99%

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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: The Caspian Basin As An Environment For Sturgeonmentioning

confidence: 99%

Section: The Caspian Basin As An Environment For Sturgeonmentioning

confidence: 99%

Section: The Caspian Basin As An Environment For Sturgeonmentioning

confidence: 99%

Section: Habitatmentioning

confidence: 99%

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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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“…Economic analysis is essential to evaluate the viability of investment, determine the efficiency of resource allocation, improve existing management practices, evaluate new culture technology, assess market potential, and identify areas in which research success would have high potential payoffs (Shang, 1990). Several factors such as illegal fishing, damaging aquatic habitats, dam construction, sand exploitation from river beds, petroleum pollution, industrial, agricultural and domestic pollution cause decline in aquatic habitat quality and affect in one way or another the fish stocks, including the sturgeons of the Caspian Sea (Khodorevskaya et al,1996, Lukyanenko et al,1999, Ivanov et al,1999Salehi, 2006;Pourkazemi, 2006;and Moghim et al, 2006). As a result, the harmful human impact has grown at an especially rapid rate.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Fish Farms

Aral¹

2011

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1994). He has worked in two animal research institutions and animal feed manufacturers. His research interests are reproduction and artificial insemination, andrology, spermatological studies, biotechnology and toxicology in animal reproduction especially in livestock and fish. Zafer Doğu was born im 1975 in Kocaeli, Turkey. He graduated from Ege University Fisheries Faculty in 1998. Same year he started his master education and graduated in 2002. He studied in Ankara University for PhD between 2006-2011. His research interests are reproduction and artificial insemination of fish, spermatological studies and biotechnology. So, he has made national and international researches on fishes' spermatlogic properties, reproduction and growth, embryonic and larval development through his academic life. He is still working as the vice-headmaster in Harran University Bozova Vocational High Scool.

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Introduction

Shelton¹,

Mims²

2015

Paddlefish Aquaculture

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Present status of commercial stocks of sturgeons in the Caspian Sea basin

Cited by 66 publications

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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

Recent Advances in Fish Farms

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