Morphological features of oogenesis of the Pacific oyster (Crassostrea gigas, Thunberg) introduced into the Black Sea

• Published in: Водные биоресурсы и среда обитания
• Main Authors: Zolotnitsky, A.P., Orlenko, A.N.
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: 2020
• Subjects: Crassostrea gigas; Oocytes; Nucleoplasmic index; Reproductive cycle; Maturity stages; Ядерно-плазменный индекс; ооциты; Половой цикл; Стадии зрелости; ASFA_2015::O::Oyster culture; ASFA_2015::A::Animal morphology; ASFA_2015::O::Oogenesis; Pacific; Pacific oyster
• Online Access: http://hdl.handle.net/1834/42600; https://doi.org/10.47921/2619-1024_2020_3_4_63

Morphological features of the Pacific oyster (Crassostrea gigas, Thunberg) oogenesis in the course of two-year cultivation cycle in Donuzlav Liman have been studied. The data on morphophysiological characteristics of this species (diameter and volume of acini, oocytes, nuclei, nucleoli, as well as the nucleoplasmic index) are given for different seasons. Quantitative changes in the size of oocytes (D) are presented in relation to water temperature (T, °С), which is described by the logistic function equation. It is shown that the dynamics of oogonia number (Nо) is linked to water temperature (T) with an inverse relation and is described by an exponential equation. The synchronicity of the changes in volumes of acini, oocytes and cell nuclei in the course of the reproductive cycle is shown, as well as the interrelationship between the volumes of these components. There was found to exist an asynchronicity in nuclei functioning and the nucleoplasmic index in the process of reproduction, which is linked with the synthesis of ribosomal proteins. Following the obtained data, 1-to-6 score of the maturity stages for the Pacific oyster females in the course of annual reproductive cycle is presented: passive state; beginning of oogenesis; active oogenesis; pre-spawning state; maturation and spawning; post-spawning transformation. The months, during which each maturity stage was the most prevalent, are given. Исследованы морфологические особенности оогенеза тихоокеанской устрицы (Crassostrea gigas, Thunberg) в процессе двухгодичного цикла выращивания в лимане Донузлав. Приведены данные по морфофизиологическим показателям этого вида: диаметру и объему ацинусов, ооцитов, ядер, ядрышек, а также ядерно-плазменного индекса в разные сезоны года. Представлены количественные изменения размера ооцитов (D) в зависимости от температуры воды (T, °С), которая описывается уравнением логистической функции. Показано, что динамика численности оогоний (Nо) связаны с температурой воды обратной зависимостью и описывает ся экспоненциальным ...