Application of mtDNA d-loop region for the study of Russian sturgeon population structure from Iranian coastline of the Caspian Sea

To evaluate the origin, genetic diversity, and population structure of domesticated rabbits in Kenya, a 263-base pair region of mtDNA D-loop region of 111 rabbits sampled from Kakamega, Vihiga, and Bungoma counties in the western region, Laikipia and Nyandarua counties in the central region, and Kitui, Machakos, and Makueni in the eastern region of the country were analyzed. The average haplotype (0.40702) and nucleotide (0.01494) diversities observed were low, indicating low genetic diversity of domesticated rabbits in Kenya. This study resolved 5 unique haplotypes in the mtDNA D-loop region. A population genetic structure distinguishing Europe grouping and domesticated rabbits in Kenya was obtained on incorporating 32 known haplotypes. Domesticated rabbits in Kenya clustered together with rabbits from other geographic regions, suggesting common origin. The results suggested that the Kenyan domesticated rabbits may have originated from Europe. Integration of exotic breeds into breeding programmes could have contributed to the low genetic diversity. These results provide useful information for breeding and conservation decisions by the relevant stakeholders in the agriculture industry in Kenya.

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DISTRIBUTION AND NUTRITION OF RUSSIAN STURGEON JUVENILES ( АCIPENSER GUELDENSTAEDTII, АCIPENSERIDAE) IN THE NORTH-WESTERN PART OF THE CASPIAN SEA

Problems of fisheries ◽

10.36038/0234-2774-2019-20-3-326-338 ◽

2019 ◽

Vol 20 (3) ◽

pp. 326-338

Author(s):

S.V. Shipulin ◽

◽

S.V. Kanat’ev ◽

I.N. Lepilina ◽

E’.Ju. Tikhonova ◽

...

Keyword(s):

Caspian Sea ◽

Russian Sturgeon ◽

The Caspian Sea ◽

The North ◽

North Western

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Temporal variability of catches, distribution and dynamics of length of Russian sturgeon in waters of the Caspian Sea in 2015 –2020

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2021-4-80-90 ◽

2021 ◽

Vol 0 (4) ◽

pp. 80-90

Author(s):

Irina Victorovna Konopleva

Keyword(s):

Caspian Sea ◽

Adult Population ◽

Water Layer ◽

Middle Part ◽

Russian Sturgeon ◽

The Caspian Sea ◽

Bottom Water Layer ◽

The North ◽

Shallow Zone ◽

Heating Up

The paper presents long-term data on catches, distribution and length dynamics of Russian sturgeon in the waters of the Caspian Sea for the summer-autumn periods in 2015-2020. When considering the catches in the different parts of the sea there is found their annual variability, which is especially noticeable in the shallow zone in the North Caspian (0.31-2.0 specimens/trawl) and in the Middle Caspian (0-1.31 specimens/trawl). In the course of determining the reasons for the interannual dynamics of catches there were revealed several decadal rises. The dependence of decadal catches on the temperature of the bottom water layer was analyzed. The highest rise in catches was observed in the first decade of September when the temperature of water lowered up to 20.0-15.0 °C. The increase was observed due to migrating individuals to the shallow zone of the Northern Caspian Sea from shallow waters. Despite the variability of catches, the localization of Russian sturgeon schooling in the northern and middle part of the sea during the summer-autumn periods of 2015-2020 has certain similar features and trends. Sturgeon species fed mainly on shallow banks and deep dumps, where the largest catches of sturgeon were recorded from 5.0 to 12.0 specimens/trawl. The absence of sturgeon at depths of up to 3.0 m isobath in the last five years is due to the water heating up to 27.6-28.8 °C. The decrease in the length of the Russian sturgeon observed in recent years is due to an increase in the proportion of youngsters (19.2-70.0%) against the background of a decrease in the adult population. It should be noted that from 2017 to 2019 there were not found the adult species in the catches by fishing nets, which indicates their continued re-moval from the population.

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Evolutionary relations and population differentiation of Acipenser gueldenstaedtii Brandt, Acipenser persicus Borodin, and Acipenser baerii Brandt

F1000Research ◽

10.12688/f1000research.10237.1 ◽

2016 ◽

Vol 5 ◽

pp. 2807

Author(s):

Alexey A. Sergeev

Keyword(s):

Dna Markers ◽

Caspian Sea ◽

Nuclear Dna ◽

Russian Sturgeon ◽

Sea Of Azov ◽

Genetic Isolation ◽

The Caspian Sea ◽

Persian Sturgeon ◽

Acipenser Gueldenstaedtii ◽

Nuclear Dna Markers

Russian (Acipenser gueldenstaedtii), Persian (A. persicus) and Siberian (A. baerii) sturgeons are closely related ‘Ponto-Caspian’ species. Investigation of their population structure is an important problem, the solution of which determines measures for conservation of these species. According to previous studies, ‘baerii-like’ mitotypes were found in the Caspian Sea among 35% of Russian sturgeon specimens, but were not found in Persian sturgeons. This confirms genetic isolation of the Persian sturgeon from the Russian sturgeon in the Caspian Sea. However, in order to clarify the relationships of these species it is necessary to analyze nuclear DNA markers. The amplified fragment length polymorphism (method) allows estimating interpopulation and interspecific genetic distances using nuclear DNA markers. In the present study, four samples were compared: Persian sturgeons from the South Caspian Sea, Russian sturgeons from the Caspian Sea and the Sea of Azov, and Siberian sturgeons from the Ob’ River, which are close to these two species, but are also clearly morphologically and genetically distinct from them. For the AFLP method, eight pairs of selective primers were used. The analysis revealed that the Siberian sturgeon has formed a separate branch from the overall Persian-Russian sturgeons cluster, which was an expected result. In addition, the results showed that the Caspian Russian sturgeon is closer to the Persian sturgeon from the Caspian Sea than to the Russian Sturgeon from the Sea of Azov. The present DNA marker data confirm that despite the genetic isolation of the Persian sturgeon from the Russian sturgeon in the Caspian Sea, the Persian sturgeon is a young species.

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Evolutionary relations and population differentiation of Acipenser gueldenstaedtii Brandt, Acipenser persicus Borodin, and Acipenser baerii Brandt

F1000Research ◽

10.12688/f1000research.10237.2 ◽

2016 ◽

Vol 5 ◽

pp. 2807

Author(s):

Alexey A. Sergeev

Keyword(s):

Dna Markers ◽

Caspian Sea ◽

Nuclear Dna ◽

Fragment Length Polymorphism ◽

Russian Sturgeon ◽

Genetic Isolation ◽

The Caspian Sea ◽

Persian Sturgeon ◽

Acipenser Gueldenstaedtii ◽

Nuclear Dna Markers

Russian ( Acipenser gueldenstaedtii), Persian ( A. persicus) and Siberian ( A. baerii) sturgeons are closely related ‘Ponto-Caspian’ species. Investigation of their population structure is an important problem, the solution of which determines measures for conservation of these species. According to previous studies, ‘baerii-like’ mitochondrial genotypes were found in the Caspian Sea among 35% of Russian sturgeon specimens, but were not found in Persian sturgeons. This confirms genetic isolation of the Persian sturgeon from the Russian sturgeon in the Caspian Sea. However, in order to clarify the relationships of these species it is necessary to analyze nuclear DNA markers. The amplified fragment length polymorphism (method) allows estimating interpopulation and interspecific genetic distances using nuclear DNA markers. In the present study, four samples were compared: Persian sturgeons from the South Caspian Sea, Russian sturgeons from the Caspian Sea and the Sea of Azov, and Siberian sturgeons from the Ob’ River, which are close to the latter two species, but are also clearly morphologically and genetically distinct from them. For the amplified fragment length polymorphism (AFLP) method, eight pairs of selective primers were used. The analysis revealed that the Siberian sturgeon has formed a separate branch from the overall Persian-Russian sturgeons cluster, which was an expected result. In addition, the results showed that the Caspian Russian sturgeon is closer to the Persian sturgeon from the Caspian Sea than to the Russian Sturgeon from the Sea of Azov. The present DNA marker data confirm that despite the genetic isolation of the Persian sturgeon from the Russian sturgeon in the Caspian Sea, the Persian sturgeon is a young species.

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Otolith microstructure of the Russian sturgeon, Acipenser gueldenstadti

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315402006070 ◽

2002 ◽

Vol 82 (4) ◽

pp. 679-680

Author(s):

Takaomi Arai ◽

Nobuyuki Miyazaki

Keyword(s):

Caspian Sea ◽

Age Determination ◽

Russian Sturgeon ◽

Otolith Microstructure ◽

The Caspian Sea ◽

Otolith Increments ◽

Anterior Side

Otolith microstructure of the Russian sturgeon, Acipenser gueldenstadti was examined in adult samples collected in the Caspian Sea. The microstructure of the otolith was the same among specimens. The anterior side of the sagitta grew in two directions elongating both the long and short arms, and the long arm sections exhibited 14–21 distinct translucent and opaque zones. Otolith increments in this species can be used for age determination.

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Theoretical Estimate of Energy Balance and Nutritional Needs of the Population of Russian Sturgeon Acipenser gueldenstaedtii in the Caspian Sea

Croatian Journal of Fisheries ◽

10.2478/cjf-2019-0007 ◽

2019 ◽

Vol 77 (2) ◽

pp. 63-76 ◽

Cited By ~ 1

Author(s):

Leonid Alexandrovich Zykov ◽

Botagoz Murasovna Nasibulina ◽

Tatyana Fedorovna Kurochkina ◽

Attaala Muhaysin Ali ◽

Nikolai Nikolaevich Popov ◽

...

Keyword(s):

Energy Balance ◽

Caspian Sea ◽

Theoretical Estimate ◽

Russian Sturgeon ◽

Natural Mortality ◽

The Caspian Sea ◽

Energy Process ◽

Acipenser Gueldenstaedtii ◽

Natural Reproduction ◽

Nutritional Needs

Abstract Individual and group annual rations of Russian sturgeon Acipenser gueldenstaedtii are calculated on the basis of models describing the energy balance and dynamics of the number of fish generations with natural mortality depending on age. The structure of the energy balance and its separate components were studied. It is shown that the greatest amount of energy of consumed food by the population is spent on energy process. Individual rations of Russian sturgeon increase with age, whereas group rations decrease. The received results can be used to theoretically estimate the volumes of artificial and natural reproduction that provides the formation of stocks of Russian sturgeon in accordance with the forage productivity of the Caspian Sea.

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