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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">vetpatol</journal-id><journal-title-group><journal-title xml:lang="ru">Ветеринарная патология</journal-title><trans-title-group xml:lang="en"><trans-title>Russian Journal of Veterinary Pathology</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2949-4826</issn><publisher><publisher-name>Don State Technical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.23947/2949-4826-2025-24-4-7-16</article-id><article-id custom-type="elpub" pub-id-type="custom">vetpatol-2086</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>ПАРАЗИТОЛОГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PARASITOLOGY</subject></subj-group></article-categories><title-group><article-title>Зараженность черноморско-каспийской тюльки (Clupeonella cultriventris) в Камском водохранилище цестодой рода Proteocephalus и гистологическое исследование кишечника рыбы при инвазии данными паразитами</article-title><trans-title-group xml:lang="en"><trans-title>Infestation of Black Sea-Caspian Sprat (Clupeonella Cultriventris) with Cestodes of the Genus Proteocephalus in the Kama Reservoir and Histological Examination of Fish Intestines Infested with These Parasites</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2108-275X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лазарева</surname><given-names>О. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Lazareva</surname><given-names>O. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ольга Игоревна Лазарева, кандидат биологических наук, доцент кафедры инфекционных болезней</p><p>614990, г. Пермь, ул. Петропавловская, д. 23</p></bio><bio xml:lang="en"><p>Olga I. Lazareva, Cand. Sci. (Biology), Associate Professor of Infectious Diseases Department</p><p>23, Petropavlovskaya Str., Perm, 614990</p></bio><email xlink:type="simple">ol.manina@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0915-3540</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сивкова</surname><given-names>Т. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Sivkova</surname><given-names>T. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Татьяна Николаевна Сивкова, доктор биологических наук, доцент, профессор кафедры инфекционных болезней</p><p>614990, г. Пермь, ул. Петропавловская, д. 23</p></bio><bio xml:lang="en"><p>Tatyana N. Sivkova, Dr. Sci. (Biology), Associate Professor, Professor of the Infectious Diseases Department</p><p>23, Petropavlovskaya Str., Perm, 614990</p></bio><email xlink:type="simple">tatiana-sivkova@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Пермский государственный аграрно-технологический университет имени академика Д.Н. Прянишникова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Perm State Agro-Technological University Named after Academician D.N. Pryanishnikov</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>18</day><month>01</month><year>2026</year></pub-date><volume>24</volume><issue>4</issue><fpage>7</fpage><lpage>16</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Лазарева О.И., Сивкова Т.Н., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Лазарева О.И., Сивкова Т.Н.</copyright-holder><copyright-holder xml:lang="en">Lazareva O.I., Sivkova T.N.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" 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://www.vetpat.ru/jour/article/view/2086">https://www.vetpat.ru/jour/article/view/2086</self-uri><abstract><p>Введение. Черноморско-каспийская тюлька (Clupeonella cultriventris) является адаптировавшимся вселенцем в Камском водохранилище, способным влиять на трофические связи в данной экосистеме. При этом состав ее гельминтофауны и патологические изменения под влиянием отдельных патогенов, таких как цестоды рода Proteocephalus, в настоящее время малоизучены. Цель работы — исследовать зараженность C. сultriventris в Камском водохранилище цестодой рода Proteocephalus и описать гистологические изменения кишечника рыбы при данной инвазии.Материалы и методы. C. cultriventris (n=83) отобрана в осенне-зимний период 2024 г. в нескольких районах Камского водохранилища. Применяли неполный биологический анализ, неполное гельминтологическое вскрытие и гистологическое исследование кишечника при инвазии цестодами. Паразитологическое исследование выполняли на кафедре инфекционных болезней ФГБОУ ВО ПГАТУ. Изготовление препаратов для гистологического исследования выполняли в лаборатории гистопатологии ГБУЗ ПК «Краевая детская клиническая больница». Готовые гистологические срезы сканировали с помощью автоматической системы Vision Assist и программного обеспечения для автоматизации микроскопии Vision. Математическую обработку полученных данных выполняли в программе Microsoft Excel.Результаты исследования. Наибольшая экстенсивность инвазии ЭИ 50 % при интенсивности инвазии ИИ 1-2 Proteocephalus sp. (juv) тюльки отмечалась в центральном районе Камского водохранилища; в несколько раз меньше — в верхнем районе (ЭИ 13 % при ИИ 1-3); тюлька из нижнего района была полностью свободна от инвазии. Размерно-весовые параметры тюльки из верхнего и нижнего районов водохранилища были существенно выше, чем рыбы из центрального района, — примерно в 2 раза по весу и в 1,2 раза по длине. Гистологическое исследование кишечника тюльки выявило изменения на уровне слизистого и подслизистого слоев, эпителий находился в состоянии десквамации, строма ворсинок рыхлая и отечная.Обсуждение и заключение. Впервые приводятся данные о зараженности C. cultriventris в Камском водохранилище цестодами Proteocephalus sp. Установлено, что инвазия цестодами оказывает влияние на биологические характеристики рыбы и вызывает в кишечнике незначительные патологические изменения воспалительного характера. Обнаружение предвзрослых цестод у неспецифических хозяев не позволяет провести их идентификацию, поэтому для уточнения паразито-хозяинных отношений между C. cultriventris и Proteocephalus sp. необходимы дополнительные исследования.</p></abstract><trans-abstract xml:lang="en"><p>Introduction. The Black Sea-Caspian sprat (Clupeonella cultriventris) is an alien species adapted to the Kama Reservoir conditions, capable of affecting the trophic relationships in this ecosystem. However, the composition of helminth fauna in this ecosystem and the pathological changes induced by the certain pathogens, such as cestodes of the genus Proteocephalus, are currently poorly investigated. The aim of the study is to investigate the infestation of C. cultriventris with cestodes of the genus Proteocephalus in the Kama Reservoir and to describe the histological changes in the fish intestines caused by this infestation.Materials and Methods. In the autumn-winter period of 2024, the C. cultriventris (n=83) were taken from the several parts of the Kama Reservoir. A partial biological analysis, partial helminthological dissection and histological examination of the intestines infested with cestodes were carried out. Parasitological examination was performed at the Department of Infectious Diseases of Perm State Agro-Technological University. Preparation of histological specimens was performed in the histopathology laboratory of Perm Regional Children’s Clinical Hospital. The prepared histological sections were scanned using the Vision Assist automated system and Vision microscopy automation software. Mathematical processing of the obtained data was performed in Microsoft Excel.Results. The highest infestation extensity (IE 50%) of Proteocephalus sp. (juv) corresponding to infestation intensity (II) range 1–2 was observed in sprat form the middle part of the Kama Reservoir; in sprat from the upper part, it was several times less (IE 13% corresponding to II range 1–3); sprat from the lower part was not infested at all. The size and weight parameters in sprat from the upper and lower parts of the Reservoir were significantly higher than that in the fish from the middle part — approximately 2 times exceedance in weight and 1.2 times — in length. Histological examination of sprat intestines revealed changes in mucosa and submucosa layers; the epithelium was in a state of desquamation, the stromal state of the villi was loose and edematous.Discussion and Conclusions. Data on infestation of C. cultriventris with the cestodes of the genus Proteocephalus sp. in the Kama Reservoir are presented for the first time. It has been revealed that cestode infestation affects the biological parameters of fish and causes minor inflammatory pathological changes in the intestines. Detection of the pre-mature cestodes in the non-specific hosts is not enough factor for their identification, therefore, further research is needed to clarify the host-parasite relationships of C. cultriventris and Proteocephalus sp.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>тюлька</kwd><kwd>Clupeonella cultriventris</kwd><kwd>Камское водохранилище</kwd><kwd>зараженность</kwd><kwd>паразиты</kwd><kwd>цестода</kwd><kwd>Proteocephalus</kwd><kwd>инвазия</kwd><kwd>гистологическое исследование</kwd><kwd>кишечник</kwd></kwd-group><kwd-group xml:lang="en"><kwd>sprat</kwd><kwd>Clupeonella cultriventris</kwd><kwd>Kama Reservoir</kwd><kwd>infestation</kwd><kwd>parasites</kwd><kwd>cestode</kwd><kwd>Proteocephalus</kwd><kwd>invasion</kwd><kwd>histological examination</kwd><kwd>intestines</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">Karabanov DP, Pavlov DD, Dgebuadze YuYu, Bazarov MI, Borovikova EA, Gerasimov YV, et al. 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