scholarly journals GROWTH OF STERLET (ACIPENSER RUTHENUS L.) OF KUIBYSHEV RESERVOIR (BASED ON MATHERIALS OF 2012–2019)

2020 ◽  
Vol 2020 (3) ◽  
pp. 40-49
Author(s):  
Anton Valentinovich Granin ◽  
Firdauz Mubarakovna Shakirova ◽  
Rail Gaiazovich Tairov ◽  
Mikhail Aleksandrovich Gorshkov ◽  
Andrei Eduardovich Kalaida ◽  
...  
Keyword(s):  
Older Individuals ◽  
Kuibyshev Reservoir ◽  
Volga River ◽  
Acipenser Ruthenus ◽  
Russian Research Institute ◽  
Reservoir Watershed ◽  
Slow Growing ◽  
Sterlet Acipenser Ruthenus ◽  
Better Than

The article analyzes the data of long-term studies of sterlet growth in the Kuibyshev Reservoir (watershed of the Volga River) conducted by researchers of the Tatar branch of the All-Russian Research Institute of Fisheries and Oceanography. Significant variations in sterlet length were found not only from year to year, but also in different parts of the reservoir. There have been stated the changes in sterlet population. In recent years, the reservoir has seen an improvement in the growth of sterlet yearlings in comparison with that of fish in the Volga river and in the first years of the reservoir's existence, and a decrease in the growth rate and size of older individuals. It has been found that starlet species in Kama Reaches grow better than in other parts of the reservoir. Fish with fast linear growth is found to increase its percentage, while the part of slow-growing fish decreases.

scholarly journals IMPACT OF FREEZING SPEED ON BREEDING QUALITIES OF STURGEON SPERM

2019 ◽  
pp. 83-90
Author(s):  
Maria Mikhailovna Belaya ◽  
Alexandra Andrianovna Krasilnikova
Keyword(s):  
Russian Sturgeon ◽  
Freezing Process ◽  
Cell Organelles ◽  
Acipenser Gueldenstaedtii ◽  
Acipenser Ruthenus ◽  
Long Term Storage ◽  
Species Specific ◽  
Sterlet Acipenser Ruthenus

The article describes the methods of cryopreservation which provides the reliable protection of cell organelles integrity after freezing-defrosting processes, as well as the needed supply of organic substances generating metabolic process in cells and tissues after a double temperature shock, and helps to achieve a significant progress in the cell long-term storage. There are considered the aspects of low temperature preservation of sturgeon sperm. Reproductive cells of Russian sturgeon ( Acipenser gueldenstaedtii Brandt & Ratzeburg, 1833) and sterlet ( Acipenser ruthenus Linnaeus, 1758) obtained at sturgeon hatcheries of the Astrakhan region and the research-expeditionary base “Kagalnik” in the Rostov region during spawning campaign served as the material for research. The purpose of the work was to establish optimal freezing rates during sturgeon sperm cryopreservation process that could ensure saving structural components of reproductive cells. It has been found that the freezing rate is species-specific. The best freezing speed for Russian sturgeon sperm proved to be 3°C/min. When experimenting with sterlet sperm there was registered less damage after freezing and defrosting at 10°C/min. Freezing speed 3°C/min was found less effective for sterlet sperm. Staged freezing process showed worse results in both cases. However, the quality of defrosted sperm didn’t get lower the fish breeding standards in all three studied speeds, which justifies sturgeon sperm freezing at all three rates subject to different conditions of preservation.

scholarly journals Intraspecific Hybrids Versus Purebred: A Study of Hatchery-Reared Populations of Sterlet Acipenser ruthenus

Animals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1149
Author(s):  
Sahana Shivaramu ◽  
Ievgen Lebeda ◽  
Vojtěch Kašpar ◽  
Martin Flajšhans
Keyword(s):  
Body Weight ◽  
Genetic Polymorphism ◽  
Growth Traits ◽  
Volga River ◽  
Intraspecific Hybridization ◽  
Acipenser Ruthenus ◽  
Physiological Fitness ◽  
Reciprocal Crossing ◽  
Intraspecific Hybrids ◽  
Better Than

Hatchery-reared sterlet originating from the Danube and Volga river basins that showed population-discriminatory alleles on at least one microsatellite locus were used to produce purebred (within-population) and hybrid crosses to evaluate intraspecific hybridization with respect to the genetic polymorphism and physiological fitness of fish for commercial aquaculture and, conservation programs. Reciprocal crossing assessed the effect of parent position. The fish were reared in indoor and outdoor tanks and monitored over 504 days for growth traits. The highest final mean body weight (144.9 ± 59.5 g) was recorded in the Danube (♀) × Volga (♂) hybrid and the highest survival in the Volga (♀) × Danube (♂) hybrid. The Volga purebred exhibited the lowest mean body weight (124.8 ± 57.6 g). A set of six microsatellites was used to evaluate the heterozygosity. The mean number of alleles was highest in the Danube (♀) × Volga (♂) hybrid and lowest in the Volga purebred, suggesting an influence of the parent position in the hybridization matrix. The higher level of genetic polymorphism, as in the Danube (♀) × Volga (♂) hybrid, may confer greater fitness in a novel environment. Our analysis revealed that the intraspecific hybrids performed better than the purebred fish in the controlled and suboptimal rearing conditions.

scholarly journals LINEAR-WEIGHT CHARACTERISTICS OF STERLET ACIPENSER RUTHENUS (LINNAEUS, 1758) OF THE LOWER IRTYSH (UVAT DISTRICT)

2018 ◽  
pp. 17-24 ◽  
Author(s):  
Gleb Igorevich Volosnikov
Keyword(s):  
Weight Gain ◽  
Linear Growth ◽  
Age Groups ◽  
Age Group ◽  
Annual Increment ◽  
Acipenser Ruthenus ◽  
Absolute Length ◽  
Barents And Kara Seas ◽  
Slow Growing ◽  
Sterlet Acipenser Ruthenus

Sterlet ( Acipenser ruthenus (Linnaeus, 1758)) is a widespread, but small in number freshwater fish that lives in the waters of Europe, Siberia, the Black, Azov, Caspian, Baltic, White, Barents, and Kara Seas. In catches made for conducting forensic expertise in 2015-2017 there occurred sterlet with absolute length from 23.9 to 50 cm, total weight from 54 to 722 g, the age varied from 1 to 7 years. Juvenile stage individuals made 25%, females - 46.9%, males - 28.1%. The annual increment in the age group from 1-2 years old was 1.2 cm, at the age 2-3 years old - 4.3 cm, at the age of 3-4 years old - 6.4 cm, at the age of 4-5 years old - 2.1 cm. This sample has a feature in the presence of slow-growing fish of old age. The rate of linear growth decreases after the 4th year and makes 5.1%. The annual increase in body weight at the age of 1-2 years old was 15.8 g, at 3 years old - 71.2 g, at 4 - 196 g, at 5 - 67 g, accordingly. Weight gain at the age of 1-2 years old was 18.7%, at 2-3 - 70.8%. In categories at the age of 3-4 years old and 4-5 years old the weight gain was 114.6% and 18.3%, correspondingly. Sterlet sires with II stage of maturity of sexual products were dominating. Among the examined individuals the predominant ones had I degree of fat content; species with a given degree were met in all age groups. There was stated a large number of long-nosed individuals (97.7%) and extremely small number of short-nosed individuals (2.3%).

scholarly journals Seasonal variability of sulfate ions in the Volga River water

Vestnik MGTU ◽  
2021 ◽  
Vol 24 (2) ◽  
pp. 202-213
Author(s):  
Vladimir Anatolyevich Seleznev
Keyword(s):  
River Water ◽  
Seasonal Variability ◽  
High Water ◽  
Outlet Section ◽  
Spring Flood ◽  
Kuibyshev Reservoir ◽  
Volga River ◽  
Sulfate Ions ◽  
Long Term Observation

In the Volga River water, sulfate ions rank second among the main anions in terms of their contribution to water mineralization. To study the seasonal variability of sulfate concentration, an analysis of long-term data of hydrological and hydrochemical observations obtained on the River Volga (in the outlet section of the Kuibyshev reservoir) has been carried out. For the period of 2001-2018 the average annual water consumption in the dam section varied in the range of 6.2-9.0 thousand m3/s, the average annual concentration of sulfates was 55 mg/dm3, the highest - 64 mg/dm3, and the lowest - 45 mg/dm3. The content of sulfates in the reservoir is formed mainly under the influence of the Volga River water coming from the Cheboksary reservoir and the Kama River water coming from the Nizhnekamsk reservoir. The sulfate content is characterized by significant seasonal variability. During the winter low-water period, the highest concentrations of sulfates were observed with a maximum in April, before the beginning of the spring flood (67 mg/dm3). During the flood, the content of sulfates decreased, reaching the lowest values during the summer low-water period in August (44 mg/dm3), and then, from September, the concentration of sulfates gradually increased, reaching 57 mg/dm3 at the beginning of the winter low-water period. Over a long-term observation period, the amplitude of sulfate fluctuations was 34-87 mg/dm3, and its value depended on the water content of a particular year. In dry years, the concentration of sulfates in the water increased, and in dry years, it decreased. In the seasonal context, the main differences in sulfate concentrations in dry and high-water years occurred during the spring flood and winter low-water period, and during the summer - autumn low-water period, the differences became minimal.

scholarly journals Locking down the Impact of New Zealand’s COVID-19 Alert Level Changes on Pets

Animals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 758
Author(s):  
Fiona Esam ◽  
Rachel Forrest ◽  
Natalie Waran
Keyword(s):  
New Zealand ◽  
Separation Anxiety ◽  
National Surveys ◽  
Normal Life ◽  
Pet Owners ◽  
Level 1 ◽  
The Impact ◽  
Better Than

The influence of the COVID-19 pandemic on human-pet interactions within New Zealand, particularly during lockdown, was investigated via two national surveys. In Survey 1, pet owners (n = 686) responded during the final week of the five-week Alert Level 4 lockdown (highest level of restrictions—April 2020), and survey 2 involved 498 respondents during July 2020 whilst at Alert Level 1 (lowest level of restrictions). During the lockdown, 54.7% of owners felt that their pets’ wellbeing was better than usual, while only 7.4% felt that it was worse. Most respondents (84.0%) could list at least one benefit of lockdown for their pets, and they noted pets were engaged with more play (61.7%) and exercise (49.7%) than pre-lockdown. Many respondents (40.3%) expressed that they were concerned about their pet’s wellbeing after lockdown, with pets missing company/attention and separation anxiety being major themes. In Survey 2, 27.9% of respondents reported that they continued to engage in increased rates of play with their pets after lockdown, however, the higher levels of pet exercise were not maintained. Just over one-third (35.9%) of owners took steps to prepare their pets to transition out of lockdown. The results indicate that pets may have enjoyed improved welfare during lockdown due to the possibility of increased human-pet interaction. The steps taken by owners to prepare animals for a return to normal life may enhance pet wellbeing long-term if maintained.

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