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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">Biology Bulletin</journal-id><journal-title-group><journal-title xml:lang="en">Biology Bulletin</journal-title><trans-title-group xml:lang="ru"><trans-title>Известия Российской академии наук. Серия биологическая</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1026-3470</issn><issn publication-format="electronic">3034-5367</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">647732</article-id><article-id pub-id-type="doi">10.31857/S1026347023700166</article-id><article-id pub-id-type="edn">MXSQXX</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>ФИЗИОЛОГИЯ ЖИВОТНЫХ И ЧЕЛОВЕКА</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">The Intra-Annual Variability of Immune System Organs and Lysozyme Content in Male Pike <italic>Esox lucius</italic> L.</article-title><trans-title-group xml:lang="ru"><trans-title>Внутригодовая изменчивость органов иммунной системы и содержания лизоцима у самцов щуки <italic>Esox lucius</italic> L.</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Subbotkin</surname><given-names>M. F.</given-names></name><name xml:lang="ru"><surname>Субботкин</surname><given-names>М. Ф.</given-names></name></name-alternatives><email>smif@ibiw.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Subbotkina</surname><given-names>T. A.</given-names></name><name xml:lang="ru"><surname>Субботкина</surname><given-names>Т. А.</given-names></name></name-alternatives><email>smif@ibiw.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Papanin Institute of Inland Water Biology, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт биологии внутренних вод им. И.Д. Папанина 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><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>404</fpage><lpage>412</lpage><history><date date-type="received" iso-8601-date="2025-01-28"><day>28</day><month>01</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, М.Ф. Субботкин, Т.А. Субботкина</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, М.Ф. Субботкин, Т.А. Субботкина</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">М.Ф. Субботкин, Т.А. Субботкина</copyright-holder><copyright-holder xml:lang="ru">М.Ф. Субботкин, Т.А. Субботкина</copyright-holder></permissions><self-uri xlink:href="https://medjrf.com/1026-3470/article/view/647732">https://medjrf.com/1026-3470/article/view/647732</self-uri><abstract xml:lang="en"><p id="idm45181324380544">The effect of the physiological state on the lysozyme concentration in the liver, kidney, spleen and serum, as well as the total amount of the enzyme in the organs, was studied in male pike <italic>Esox lucius</italic> L., 1758 under different conditions of the annual cycle. Multidirectional intra-annual dynamics of organ somatic indices and quantitative parameters of lysozyme in fish tissues and organs, depending on the temperature regime of the water body, was found. Despite significant changes in liver size and lysozyme concentration, the total amount of the enzyme in the organ, the lysozymic index, remained constant. A similar result was found in the spleen. When the influence of the temperature factor at low temperatures was minimized, the liver parameters changed to the opposite ones, while those in the kidney remained unchanged. Such a temperature regime did not affect the spleen parameters and the concentration of the enzyme in the serum. With significant differences between the liver and spleen in the enzyme concentration and size, their lysozymic indices were indicators of the same level. Stages of gonad maturity affected the liver index and the amount of lysozyme in the kidney, but the correlation of the kidney enzyme with maturity was not significant. The kidney lysozyme and the spleen parameters correlated with body mass without organs, although fish weight and length were not influencing factors. The size of the kidney, unlike the spleen, did not affect the enzyme in fish tissues. The liver and kidney enzyme concentrations and kidney lysozymic index were inversely correlated with liver size. A complex nature of the enzyme relationships in organs was revealed, at which the amount of lysozyme in one organ could affect the amount of the enzyme in the other. The relationship between the concentration of serum lysozyme and the morphophysiological parameters of fish under stable low temperature conditions in the water body was not found.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181324377360">Изучали влияние физиологического состояния на концентрацию лизоцима в печени, почках, селезенке и сыворотке крови, а также общее количество фермента в органах, у самцов щуки <italic>Esox lucius</italic> L., 1758 в разных условиях годового цикла. Обнаружена разнонаправленная внутригодовая динамика соматических индексов органов и количественных показателей лизоцима в тканях и органах рыб, зависящая от температурного режима водоема. Несмотря на значительные изменения размеров печени и концентрации лизоцима, общее количество фермента в органе – лизоцимный индекс, оставалось постоянным. Подобный результат обнаружен и для селезенки. При минимизации влияния температурного фактора в условиях низких температур показатели печени сменились на противоположные, а в почках остались без изменений. Такой температурный режим не влиял на показатели селезенки и концентрацию фермента в сыворотке. При существенных различиях по концентрации фермента и размерам между печенью и селезенкой их лизоцимные индексы были показателями одного уровня. Стадии зрелости гонад влияли на индекс печени и количество лизоцима в почках, но корреляция фермента почек со зрелостью не достоверна. Лизоцим почек и показатели селезенки коррелировали с массой рыб без органов, хотя масса и длина рыб не были влияющими факторами. Размер почек, в отличие от селезенки, не влиял на фермент в тканях рыб. Концентрация фермента в печени и почках, и лизоцимный индекс почек были в обратной корреляции с размером печени. Выявлен сложный характер взаимосвязей фермента в органах, при котором количество лизоцима в одном органе могло влиять на количество фермента в другом. Не обнаружено связи концентрации сывороточного лизоцима с морфофизиологическими параметрами рыб в условиях стабильно низких температур водоема.</p></trans-abstract><kwd-group xml:lang="en"><kwd>lysozyme</kwd><kwd>organs</kwd><kwd>serum</kwd><kwd>somatic and lysozymic indices</kwd><kwd>physiological state</kwd><kwd>temperature</kwd><kwd>season</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>лизоцим</kwd><kwd>органы</kwd><kwd>сыворотка</kwd><kwd>соматические и лизоцимные индексы</kwd><kwd>физиологическое состояние</kwd><kwd>температура</kwd><kwd>сезон</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Буторин Н.В., Курдина Т.Н., Бакастов С.С. 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