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  • 1
    Publication Date: 2024-01-10
    Description: This work presents quantitative data collected in the course of zander and roach artificial reproduction in the hatcheries of the Krasnodar Territory in 2023. Based on the surveys, 4.68 t of roach and 17.5 t of zander entered the reservoirs of Yeysk Experimental Hatchery for spawning. For the first time during the long-term observations, young individuals of low reproductive quality prevailed in the roach spawning stock. During the downstream migration, roach juveniles were absent in catches, and zander juveniles occurred very sporadically, which indicates their increased loss during all stages of early ontogenesis. The data collected in Beysug Hatchery gives evidence of 2.484 t of roach and 2.557 t of zander entering its reservoirs for spawning. In June–July, during the downstream migration, 16.48 million ind. of roach juveniles, which weight ranged from 0.3 to 1.2 g, were recorded; for zander juveniles these values were 0.140 million ind. and 0.91–1.53 g. The downstream migration of juveniles continued in August. At the floodgate of East-Akhtarsk Hatchery, the monitoring of breeders recorded 0.457 t of roach and 0.088 t of zander. The breeders were of low reproductive quality. Based on quantitative evaluation, the reproduction yield in the East-Akhtarsk Hatchery reservoir was 153.4 million ind. of roach (weight ranging from 0.3 to 0.96 g) and 102.25 million ind. of zander (weight 1.28–2.07 g). The monitoring of breeders entering the limans of Chernoerkovsk Hatchery recorded 8.0 t of roach and 12.85 t of zander. Chernorkovsk Hatchery showed the highest results: 426.32 million ind. of roach juveniles (weight 0.3–0.9 g) and 218.16 million ind. of zander juveniles (weight 0.47–3.37 g). Analysis of the obtained data has shown that low reproductive efficiency of both roach and zander is indicative for almost all investigated reservoirs of the hatcheries.
    Description: В работе приводятся материалы, характеризующие количественные показатели искусственного воспроизводства судака и тарани в нерестово-выростных хозяйствах Краснодарского края в 2023 г. По учетным данным на нерест в водоемы Ейского ЭХРВР зашло 4,68 т тарани и 17,5 т судака. Впервые за ряд лет наблюдений в нерестовом стаде тарани преобладали младшевозрастные особи с низкими рыбоводными показателями. В период ската молодь тарани в уловах отсутствовала, а молодь судака встречалась единично, что свидетельствует о повышенном отходе молоди на всех этапах раннего онтогенеза. По данным Бейсугского НВХ на нерест в водоемы было пропущено 2,484 т тарани и 2,557 т судака. При скате молоди в июне–июле было учтено 16,48 млн экз. молоди тарани массой 0,3–1,2 г и 0,140 млн экз. молоди судака массой 0,91– 1,53 г, в августе скат молоди продолжался. При мониторинге захода производителей на шлюзе Восточно-Ахтарского НВХ было учтено 0,457 т тарани и 0,088 т судака. Производители характеризовались низкими рыбоводными показателями. По итогам бонитировочного учета объемы воспроизводства в водоемах ВАНВХ составили 153,4 млн экз. тарани массой 0,3–0,96 г и 102,25 млн экз. судака массой 1,28–2,07 г. При мониторинге захода производителей в лиманы ЧНВХ было учтено 8,0 т тарани и 12,85 т судака. На Черноерковском НВХ получены самые высокие результаты, всего было учтено 426,32 млн экз. молоди тарани массой 0,3–0,9 г и 218,16 млн экз. судака массой 0,47–3,37 г. Анализ полученных материалов свидетельствует о том, что практически во всех исследуемых водоемах НВХ отмечается низкая эффективность воспроизводства молоди тарани и судака.
    Description: Published
    Description: Non Refereed
    Keywords: Нерестово-выростное хозяйство ; Молодь судака ; Молодь тарани ; Эффективность воспроизводства ; Sander lucioperca (Linnaeus, 1758) ; Rutilus rutilus (Linnaeus, 1758) ; Производители ; Yeysk Experimental Hatchery ; Chernoerkovsk Hatchery ; East-Akhtarsk Hatchery ; ASFA_2015::R::Reproduction ; ASFA_2015::J::Juveniles ; ASFA_2015::E::Efficiency
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.210-215
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  • 2
    Publication Date: 2024-01-10
    Description: Over the course of the monitoring surveys conducted in 2021–2022, the specific features of the starry sturgeon reproduction have been investigated, which covered the span from the adaptation of breeders to the release of juveniles into a natural water body. The results of this study indicate that the starry sturgeon females from the broodstock have low reproduction capacity, as well as decreased embryo survival rates and larvae yield. The starry sturgeon juveniles reared in tanks were characterized by low growth rates, decreased feed conversion efficiency, and acceptable physiological status. It has been shown that rearing the starry sturgeon juveniles in tanks is less expedient than using a combined method.
    Description: В ходе мониторинговых работ, проводимых в 2021–2022 гг., были рассмотрены особенности воспроизводственного процесса севрюги: от выдерживания производителей до выпуска молоди в естественный водоем. Результаты исследования показали, что самки севрюги из ремонтно-маточного стада обладают невысоким репродуктивным потенциалом, выживаемость эмбрионов и выход личинок снижены. Молодь севрюги, выращиваемая в бассейнах, характеризовалась невысоким темпом роста, сниженными показателями трансформации пищи, удовлетворительным физиологическим состоянием. Показано, что выращивание молоди севрюги бассейновым методом менее эффективно, чем комбинированным.
    Description: Published
    Description: Non Refereed
    Keywords: Rearing techniques ; Starry sturgeon ; Breeders ; Севрюга ; Производители ; Молодь ; Рыбоводные показатели ; Физиологическое состояние ; Кормовой коэффициент ; Интенсивность питания ; Репродуктивный потенциал ; Рыбоводно-биологическая характеристика ; ASFA_2015::F::Fish physiology ; ASFA_2015::F::Feed efficiency ; ASFA_2015::R::Reproduction ; ASFA_2015::J::Juveniles
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.216-221
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  • 3
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Notes: Abstract The extractability of nitrate complexes of trivalent plutonium from an aqueous phase at various concentrations was investigated. It was shown that tributyl phosphate (TBP) will extract trivalent plutonium from nitric acid solutions in the form of Pu(NO3)3. TBP at nitrate ion concentrations up to 1.2 M. Under the conditions studied, the distribution coefficient of trivalent plutonium depended very little on the concentration of hydrogen ions. The stability constants of the complexes Pu(NO3)3 · 3TBP, Pu(NO3)3, Pu(NO3) 2 + and Pu(NO3)2+ were determined and equaled 0.75 ± 0.1; 14.4 ± 0.8; 14.3 ± 0.8 and 5.9 ± 0.5.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Atomic energy 7 (1961), S. 728-734 
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Notes: Abstract The properties of one of the new, efficient extractants for uranium, diisoamyl methylphosphinate (DAMP), are described. It was shown that uranyl nitrate is extracted from nitric acid solutions by this extractant with considerably higher distribution coefficients than tributyl phosphate (TBP). The extraction of uranyl nitrate and HNO3 with DAMP solutions in hydrogenated kerosene was studied. It was shown that uranyl nitrate is extracted in the form of the complex [UO2(NO3)2 (DAMP)2], whose stability constant equals 2540±200, and HNO3 is extracted in the form of the compound HNO3 DAMP, whose stability constant is 0.30±0.03.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Atomic energy 17 (1964), S. 1178-1179 
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Atomic energy 6 (1960), S. 76-78 
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Notes: Abstract In a previous communication [1] we examined the effect of monobutyl phosphate (MBP) and dibutyl phosphate (DBP) on the extraction of plutonium nitrate by tributyl phosphate (TBP). In the present work the mechanism of plutonium extraction by MBP and DBP is elucidated. An investigation was made of the mechanism of plutonium nitrate extraction by MBP and DBP with an ionic strength equal to 6. It was shown that plutonium is extracted in the form of PuK4, where K is [(C4H9)2PO4 − or [C4H9HPO4]−. It was calculated that the equilibrium constant for the reaction of plutonium nitrate with MBP equals (1.5 ± 0.25)·103 and with DBP, (6.15 ± 0.85) ·103.
    Type of Medium: Electronic Resource
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