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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">tinro</journal-id><journal-title-group><journal-title xml:lang="ru">Известия ТИНРО</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya TINRO</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1606-9919</issn><issn pub-type="epub">2658-5510</issn><publisher><publisher-name>ТИНРО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26428/1606-9919-2026-206-239-255</article-id><article-id custom-type="edn" pub-id-type="custom">PMLVAJ</article-id><article-id custom-type="elpub" pub-id-type="custom">tinro-1106</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>МЕТОДИКА ИССЛЕДОВАНИЙ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>METHODS OF INVESTIGATIONS</subject></subj-group></article-categories><title-group><article-title>Методологические проблемы количественного учета покатной молоди тихоокеанских лососей рода Oncorhynchus в малых реках Сахалинской области</article-title><trans-title-group xml:lang="en"><trans-title>Methodological problems of quantitative assessment for downstream migrating juveniles of pacific salmon gen. Oncorhynchus in small rivers of the Sakhalin Region</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9955-6903</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Живоглядов</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhivoglyadov</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Андрей Александрович Живоглядов,кандидат биологических наук, ведущий научный сотрудник</p><p>693023; ул. Комсомольская, 196; Южно-Сахалинск</p></bio><bio xml:lang="en"><p>Andrey A. Zhivoglyadov, Ph.D., leading researcher</p><p>693023; 196, Komsomolskaya Str.; Yuzhno-Sakhalinsk</p></bio><email xlink:type="simple">zhivoglyadovaa@sakhniro.vniro.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Сахалинский филиал ВНИРО (СахНИРО)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Sakhalin branch of VNIRO (SakhNIRO)</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>11</day><month>04</month><year>2026</year></pub-date><volume>206</volume><issue>1</issue><fpage>239</fpage><lpage>255</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Живоглядов А.А., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Живоглядов А.А.</copyright-holder><copyright-holder xml:lang="en">Zhivoglyadov A.A.</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://izvestiya.tinro-center.ru/jour/article/view/1106">https://izvestiya.tinro-center.ru/jour/article/view/1106</self-uri><abstract><p>   Проведен критический анализ методических подходов, применяемых сотрудниками СахНИРО при количественном учете молоди тихоокеанских лососей Oncorhynchus в реках Сахалинской области. Выявлены методические и логические проблемы, снижающие воспроизводимость результатов. Показано, что использование линейной интерполяции в качестве алгоритма для расчета поправки на время при оценке распределения молоди горбуши Oncorhynchus gorbuscha по сечению контрольной реки в ряде случаев может приводить к появлению отрицательных скорректированных значений, не имеющих биологического смысла при наличии ненулевых фактических уловов и указывающих на выход алгоритма за пределы области его применимости. Предложены направления доработки методики, включающие формализацию вычислительных процедур, введение контроля качества на разных этапах, верификации и валидации данных. Подчеркивается, что без реализации указанных мер методика не обеспечивает стандартизацию расчетов и не может служить надежной основой для мониторинга численности молоди.</p></abstract><trans-abstract xml:lang="en"><p>   Methodological approaches used in the Sakhalin branch of the Russian Federal Research Institute of Fisheries and Oceanography (SakhNIRO) for quantitative assessment of pacific salmon (Oncorhynchus) juveniles in the rivers of Sakhalin Region are analyzed critically. Methodic and logical problems are revealed that worsened the results reliability. The linear interpolation used for time correction of cross-sectional distribution for juveniles of pink salmon Oncorhynchus gorbuscha in a control river gives sometimes unrealistic negative values when actual catches are not zero, that means the algorithm has limited applicability. Ways for methodological improvements are proposed, including formalization of computing procedures, implementation of quality control at certain stages, and data verification and validation. Without these measures implementation, the current methodology does not ensure standardization of calculations, so cannot serve as a reliable basis for monitoring the juveniles abundance.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>тихоокеанские лососи</kwd><kwd>реки Сахалинской области</kwd><kwd>покатная молодь</kwd><kwd>горбуша</kwd><kwd>кета</kwd><kwd>покатная миграция</kwd><kwd>методика учета</kwd><kwd>численное интегрирование</kwd><kwd>воспроизводимость</kwd><kwd>контроль качества данных</kwd></kwd-group><kwd-group xml:lang="en"><kwd>pacific salmon</kwd><kwd>Sakhalin</kwd><kwd>juvenile</kwd><kwd>pink salmon</kwd><kwd>chum salmon</kwd><kwd>downstream migration</kwd><kwd>assessment methodology</kwd><kwd>numerical integration</kwd><kwd>reliability</kwd><kwd>data quality control</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках бюджетного финансирования</funding-statement><funding-statement xml:lang="en">The study had budget funding</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Бахвалов Н.С., Жидков Н.П., Кобельков Г.М. 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