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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">vniigis</journal-id><journal-title-group><journal-title xml:lang="ru">Российский паразитологический журнал</journal-title><trans-title-group xml:lang="en"><trans-title>Russian Journal of Parasitology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1998-8435</issn><issn pub-type="epub">2541-7843</issn><publisher><publisher-name>ВНИИП – филиал ФГБНУ ФНЦ ВИЭВ РАН</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.31016/1998-8435-2021-15-3-23-31</article-id><article-id custom-type="elpub" pub-id-type="custom">vniigis-793</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФАУНА, МОРФОЛОГИЯ И СИСТЕМАТИКА ПАРАЗИТОВ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>FAUNA, MORPHOLOGY AND SYSTEMATICS OF PARASITES</subject></subj-group></article-categories><title-group><article-title>Паразиты крови некоторых видов рыб Нижнего Иртыша</article-title><trans-title-group xml:lang="en"><trans-title>Haematophagous parasites  of some fish species in the Lower Irtysh</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Либерман</surname><given-names>Е. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Liberman</surname><given-names>Е. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Елизавета Львовна Либерман</p><p>626152, Тобольск, ул. им. акад. Юрия Осипова, 15</p></bio><bio xml:lang="en"><p>Elizaveta L. Liberman</p><p>15, Yu. Osipova st., Tobolsk, 626152</p></bio><email xlink:type="simple">eilat-tymen@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Тобольская комплексная научная станция УрО РАН<country>Россия</country></aff><aff xml:lang="en">Tobolsk Complex Scientific Station of the Ural Branch of the Russian Academy of Sciences<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>14</day><month>09</month><year>2021</year></pub-date><volume>15</volume><issue>3</issue><fpage>23</fpage><lpage>31</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Либерман Е.Л., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Либерман Е.Л.</copyright-holder><copyright-holder xml:lang="en">Liberman Е.L.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://vniigis.elpub.ru/jour/article/view/793">https://vniigis.elpub.ru/jour/article/view/793</self-uri><abstract><sec><title>Цель исследований</title><p>Цель исследований: изучение зараженности рыб четырех видов кровепаразитами в реках бассейна Нижнего Иртыша. </p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Работу выполняли в реках бассейна Нижнего Иртыша в 2017–2020 гг. Всего обследовано 390 рыб различного пола и возраста, в том числе 47 экз. плотвы (Rutilus rutilus lacustris, (Pallas)), 41 язя (Leuciscus idus, (Linnaeus, 1758)), 47 щуки (Esox lucius, (Linnaeus, 1758)) и 255 сибирской стерляди (Acipenser ruthenus marsiglii (Brandt, 1833)). Кровь отбирали из хвостовой артерии, исследовали под микроскопом свежую каплю крови и готовили тонкий мазок, высушивали его на воздухе, затем фиксировали в смеси 70%-ного этилового спирта и диэтилового эфира (1 : 1) в течение 30 мин. Зафиксированные мазки высушивали на воздухе при комнатной температуре, окрашивали азур-эозином в разведении 1 : 10 в течение 40 мин. Определяли видовую принадлежность найденных паразитов. Рассчитывали экстенсивность инвазии со стандартной ошибкой среднего.</p></sec><sec><title>Результаты и обсуждение</title><p>Результаты и обсуждение. Установлено паразитирование в крови рыб представителей классов Coccidea и Kinetoplastea. У сибирской стерляди зафиксированы Trypanoplasma acipenseris и Haemogregarina acipenseris. Щука инвазирована T. schulmani и H. esoci. В крови язя и плотвы отмечена T. schulmani. Основным переносчиком жгутиконосцев и споровиков, паразитирующих в крови рыб, в бассейне Нижнего Иртыша является Piscicola geometra. Плотва и сибирская стерлядь заражаются паразитическими жгутиконосцами, начиная с возраста 1+. Все обследованные рыбы инвазированы в возрастных группах 2+ – 4+. Гемогрегарины паразитируют у щуки в возрасте 4+ и 5+, у сибирской стерляди – в группах 1+ – 4+ и 6+ – 7+.</p></sec></abstract><trans-abstract xml:lang="en"><p>The purpose of the research is study of four fish species infected with haematophagous parasites in the rivers of the Lower Irtysh basin. </p><sec><title>Materials and methods</title><p>Materials and methods. The work was performed in the rivers of the Lower Irtysh basin in 2017–2020. A total of 390 fish of different sex and age were examined including 47 roach (Rutilus rutilus lacustris, (Pallas)), 41 ide (Leuciscus idus, (Linnaeus, 1758)), 47 pike (Esox lucius, (Linnaeus, 1758)) and 255 Siberian sterlet (Acipenser ruthenus marsiglii (Brandt, 1833)). We took blood from the tail artery, and examined its fresh drop under a microscope, and prepared a thin smear, then dried it in the air and fixed in a mixture of 70% ethyl alcohol and diethyl ether (1 : 1) for 30 minutes. The fixed smears were dried in the air at room temperature and stained with azure and eosin at a dilution of 1 : 10 for 40 minutes. We identified species of the found parasites and calculated the prevalence of infection with standard error of the mean.</p></sec><sec><title>Results and discussion</title><p>Results and discussion. We found representatives of the Coccidea and Kinetoplastea classes parasitizing in fish blood. Trypanoplasma acipenseris and Haemogregarina acipenseris were recorded in the Siberian sterlet. The pike was infected with T. schulmani and H. esoci. T. schulmani was found in the blood of the ide and roach. Piscicola geometra is the main host of flagellates and sporozoans that parasitize in fish blood in the basin of the Lower Irtysh. The roach and the Siberian sterlet become infected with parasitic flagellates from the age of 1+. All examined fish were infected in age groups 2+ – 4+. Haemogregarina parasitize in the pike aged 4+ and 5+, and in the Siberian sterlet aged 1+ – 4+ and 6+ – 7+.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>зараженность</kwd><kwd>возрастная динамика</kwd><kwd>язь</kwd><kwd>плотва</kwd><kwd>сибирская стерлядь</kwd><kwd>щука</kwd><kwd>Нижний Иртыш</kwd></kwd-group><kwd-group xml:lang="en"><kwd>infection</kwd><kwd>age dynamics</kwd><kwd>ide</kwd><kwd>roach</kwd><kwd>Siberian sterlet</kwd><kwd>pike</kwd><kwd>Lower Irtysh</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Авдеева Е. В., Евдокимова Е. Б., Заостровце ва С. К. Современное состояние изучения паразитофауны рыб водоемов Калининградской области // Научный журнал Известия КГТУ. 2017. № 45. С. 24-61.</mixed-citation><mixed-citation xml:lang="en">Avdeeva E. V., Evdokimova E. B., Zaostrovtseva S. K. 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