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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">vestiag</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия аграрных наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus. Agrarian Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1817-7204</issn><issn pub-type="epub">1817-7239</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1817-7204-2026-64-1-69-75</article-id><article-id custom-type="elpub" pub-id-type="custom">vestiag-852</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>ЖЫВЁЛАГАДОЎЛЯ І ВЕТЭРЫНАРНАЯ МЕДЫЦЫНА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ANIMAL HUSBANDRY AND VETERINARY MEDICINE</subject></subj-group></article-categories><title-group><article-title>Оценка качества среды при выявлении причин гибели рыб</article-title><trans-title-group xml:lang="en"><trans-title>Habitat as a tool for identifying the causes of mass fish deaths</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>Костоусов</surname><given-names>В. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Kostousov</surname><given-names>V. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Костоусов Владимир Геннадьевич  – кандидат биологических наук, доцент, заместитель директора по научной  работе</p><p>ул. Стебенева, 22, 220024, Минск</p></bio><bio xml:lang="en"><p>Vladimir G. Kostousov – Ph. D. (Biology), AssociateProfessor, Deputy Director</p><p>22, Stebeneva St., 220024, Minsk</p></bio><email xlink:type="simple">lablakeirh@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лишко</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Lishko</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Лишко Владислав Иванович – младший научный сотрудник лаборатории рыбоводства и рыболовства в естественных водоемах</p><p>ул. Стебенева, 22, 220024, Минск</p></bio><bio xml:lang="en"><p>Vlad I. Lishko – Junior Researcher of the Laboratoryof Fish Farming and Fisheries in Natural</p><p>22, Stebeneva St., 220024, Minsk</p></bio><email xlink:type="simple">lablakeirh@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ласица</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Lasitsa</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ласица Владислав Александрович – младший научный сотрудник лаборатории рыбоводства и рыболовствав естественных водоемах</p><p>ул. Стебенева, 22, 220024, Минск</p></bio><bio xml:lang="en"><p>Vlad A. Lasitsa – Junior Researcher of the Laboratoryof Fish Farming and Fisheries in Natural</p><p>22, Stebeneva St., 220024, Minsk</p></bio><email xlink:type="simple">lablakeirh@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Попиначенко</surname><given-names>Т. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Popinachenko</surname><given-names>T. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Попиначенко Таисия Ивановна – старший научныйсотрудник лаборатории рыбоводства и рыболовствав естественных водоемах</p><p>ул. Стебенева, 22, 220024, Минск</p></bio><bio xml:lang="en"><p>Taisiya I. Popinachenko – Senior Researcher of theLaboratory of Fish Farming and Fisheries in Natural</p><p>22, Stebeneva St., 220024, Minsk</p></bio><email xlink:type="simple">lablakeirh@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Панасюк</surname><given-names>М. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Panasyuk</surname><given-names>M. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Панасюк Мария Игоревна – младший научный сотрудник лаборатории рыбоводства и рыболовства в естественных водоемах</p><p>ул. Стебенева, 22, 220024, Минск</p></bio><bio xml:lang="en"><p>Maria I. Panasyuk – Junior Researcher of the Laboratory of Fish Farming and Fisheries in Natural</p><p>22, Stebeneva St., 220024, Minsk</p></bio><email xlink:type="simple">lablakeirh@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Апсолихова</surname><given-names>О. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Apsolikhova</surname><given-names>O. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Апсолихова Ольга Дмитриевна – кандидат биологических наук, доцент, заведующий лабораторией рыбоводства и рыболовства в естественных водоемах, Институт рыбного хозяйства</p><p>ул. Стебенева, 22, 220024, Минск</p></bio><bio xml:lang="en"><p>Olga D. Apsolikhova – Ph. D. (Biology), Associate Professor, Head of the Laboratory of Fish Farming and Fisheries in Natural</p><p>22, Stebeneva St., 220024, Minsk</p></bio><email xlink:type="simple">lablakeirh@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт рыбного хозяйства, Национальная академия наук Беларуси</institution></aff><aff xml:lang="en"><institution>Fish Industry Institute, National Academy of Sciences of Belarus</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>31</day><month>01</month><year>2026</year></pub-date><volume>64</volume><issue>1</issue><fpage>69</fpage><lpage>75</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Костоусов В.Г., Лишко В.И., Ласица В.А., Попиначенко Т.И., Панасюк М.И., Апсолихова О.Д., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Костоусов В.Г., Лишко В.И., Ласица В.А., Попиначенко Т.И., Панасюк М.И., Апсолихова О.Д.</copyright-holder><copyright-holder xml:lang="en">Kostousov V.G., Lishko V.I., Lasitsa V.A., Popinachenko T.I., Panasyuk M.I., Apsolikhova O.D.</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://vestiagr.belnauka.by/jour/article/view/852">https://vestiagr.belnauka.by/jour/article/view/852</self-uri><abstract><p>Представлены результаты гидрохимического анализа, проведенного с целью установления причин массовой гибели рыбы. Рассмотрены ключевые показатели качества воды, включая концентрации растворенного кислорода, аммонийного азота, нитратов, фосфатов, а также уровни pH и температуры. Эти параметры были выбраны в качестве индикаторов, наиболее чувствительных к изменениям в водной среде и способных отразить общее состояние экосистемы. Особое внимание уделено сезонной динамике изменения гидрохимических показателей. Анализ выявил отклонение ряда параметров от предельно допустимых норм, что указывает на возможное антропогенное загрязнение водоемов. Полученные данные позволяют установить связь между изменениями гидрохимического состава воды и наблюдаемыми случаями гибели рыбы, что может служить основой для разработки мер по предупреждению подобных экологических инцидентов в будущем. Такие меры могут включать усиление контроля за источниками сбросов, внедрение программ очистки сточных вод и проведение регулярного мониторинга состояния водоемов.</p></abstract><trans-abstract xml:lang="en"><p>The results of a hydrochemical analysis conducted to determine the causes of mass death of fish are presented. The key indicators of water quality, including concentrations of dissolved oxygen, ammonium nitrogen, nitrates, phosphates, as well as pH and temperature levels, are considered. These parameters were chosen as the indicators most sensitive to changes in the aquatic environment and able to reflect the overall state of the ecosystem. Special attention is paid to the seasonal dynamics of changes in hydrochemical parameters. The analysis revealed a deviation of a number of parameters from the maximum permissible norms, which indicates possible anthropogenic pollution of water bodies. The data obtained make it possible to establish a link between changes in the hydrochemical composition of water and observed fish deaths, which can serve as a basis for developing measures to prevent similar environmental incidents in the future. Such measures may include increased control over discharge sources, the introduction of wastewater treatment programs, and regular monitoring of the condition of reservoirs.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>гидрохимия</kwd><kwd>водоем</kwd><kwd>замор</kwd><kwd>водохранилище</kwd><kwd>рыба</kwd></kwd-group><kwd-group xml:lang="en"><kwd>hydrochemistry</kwd><kwd>water</kwd><kwd>overseas</kwd><kwd>reservoir</kwd><kwd>fish</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">Camargo, J. A. Ecological and toxicological effects of inorganic nitrogen pollution in aquatic ecosystems: a global assessment / J. A. Camargo, Á. 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