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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Russian Journal of Physiology</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Physiology</journal-title><trans-title-group xml:lang="ru"><trans-title>Российский физиологический журнал им. И.М. Сеченова</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-8139</issn><issn publication-format="electronic">2658-655X</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">651553</article-id><article-id pub-id-type="doi">10.31857/S0869813923070130</article-id><article-id pub-id-type="edn">XNURLU</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>EXPERIMENTAL ARTICLES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ЭКСПЕРИМЕНТАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Cellular Composition of Erythroid Forms in the Blood and Head Kidney of the Golden Grey Mullet (<italic>Chelon auratus</italic> Risso, 1810) during the Annual Cycle</article-title><trans-title-group xml:lang="ru"><trans-title>Клеточный состав эритроидных форм в крови и головной почке кефали-сингиля (<italic>Chelon auratus</italic> Risso, 1810) на протяжении годового цикла</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Soldatov</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Солдатов</surname><given-names>А. А.</given-names></name></name-alternatives><email>alekssoldatov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rychkova</surname><given-names>V. N.</given-names></name><name xml:lang="ru"><surname>Рычкова</surname><given-names>В. Н.</given-names></name></name-alternatives><email>alekssoldatov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kukhareva</surname><given-names>T. A.</given-names></name><name xml:lang="ru"><surname>Кухарева</surname><given-names>Т. А.</given-names></name></name-alternatives><email>alekssoldatov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rokotova</surname><given-names>A. G.</given-names></name><name xml:lang="ru"><surname>Рокотова</surname><given-names>А. Г.</given-names></name></name-alternatives><email>alekssoldatov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kovalevsky Institute of Biology of the Southern Seas of RAS</institution></aff><aff><institution xml:lang="ru">Институт биологии южных морей им. А.О. Ковалевского РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-07-01" publication-format="electronic"><day>01</day><month>07</month><year>2023</year></pub-date><volume>109</volume><issue>7</issue><fpage>990</fpage><lpage>1001</lpage><history><date date-type="received" iso-8601-date="2025-02-01"><day>01</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, А.А. Солдатов, В.Н. Рычкова, Т.А. Кухарева, А.Г. Рокотова</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, А.А. Солдатов, В.Н. Рычкова, Т.А. Кухарева, А.Г. Рокотова</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">А.А. Солдатов, В.Н. Рычкова, Т.А. Кухарева, А.Г. Рокотова</copyright-holder><copyright-holder xml:lang="ru">А.А. Солдатов, В.Н. Рычкова, Т.А. Кухарева, А.Г. Рокотова</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-8139/article/view/651553">https://journals.eco-vector.com/0869-8139/article/view/651553</self-uri><abstract xml:lang="en"><p id="idm45181323674352">The changes in the number of erythrocytes in the blood and the production of erythrocytes by the hematopoietic tissue of the golden grey mullet (<italic>Chelon auratus</italic> Risso, 1810) during the annual cycle were studied. Catching and delivery of fish to the aquarium was carried out monthly. The content of immature erythroid forms was determined: erythroblasts, basophilic and polychromatophilic normoblasts, in the head kidney (pronephros) and circulating blood. It has been established that the processes of erythropoiesis in the hematopoietic tissue of the golden grey mullet proceed irregularly. The active production of erythroid mass is mainly confined to the post-spawning period. This is evidenced by an increase in the content of immature erythroid forms in the head kidney and blood. This coincides with a general increase in the number of red blood cells in the circulation system and indicates a shift in the erythrocyte balance in favor of production processes. In the rest of the time, the processes are opposite. It is assumed that this is due to the peculiarities of the organization of the red blood system, which excludes the regular production of erythropoietin in the kidneys.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181323673472">Исследовали изменение числа эритроцитов и содержание незрелых эритроидных форм в крови и гемопоэтической ткани кефали-сингиля (<italic>Chelon auratus</italic> Risso, 1810) на протяжении годового цикла. Отлов и доставку рыбы в аквариальную проводили ежемесячно. Определяли содержание эритробластов, базофильных и полихроматофильных нормобластов в головной почке (пронефрос) и циркулирующей крови. Установлено, что процессы эритропоэза в гемопоэтической ткани кефали-сингиля протекают нерегулярно. Активная продукция эритроидной массы приурочена в основном к постнерестовому периоду. Об этом свидетельствует увеличение содержания незрелых эритроидных форм в головной почке и крови. Это совпадает с общим увеличением числа клеток красной крови в системе циркуляции и свидетельствует о смещении эритроцитарного баланса в пользу продукционных процессов. В остальной период времени процессы противоположны. Допускается, что это связано с особенностями организации системы красной крови, которая исключает регулярную продукцию эритропоэтина в почках.</p></trans-abstract><kwd-group xml:lang="en"><kwd>erythrocytes</kwd><kwd>erythropoiesis</kwd><kwd>head kidney</kwd><kwd><italic>Chelon auratus</italic> Risso</kwd><kwd>1810</kwd><kwd>annual cycle</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>эритроциты</kwd><kwd>эритропоэз</kwd><kwd>головная почка</kwd><kwd><italic>Chelon auratus</italic> Risso</kwd><kwd>1810</kwd><kwd>годовой цикл</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Soldatov AA (2005) Peculiarities of organization and functioning of the fish red blood system (review). 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