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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="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Journal of Ichthyology</journal-id><journal-title-group><journal-title xml:lang="en">Journal of Ichthyology</journal-title><trans-title-group xml:lang="ru"><trans-title>Вопросы ихтиологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0042-8752</issn><issn publication-format="electronic">3034-5146</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">700401</article-id><article-id pub-id-type="doi">10.7868/S3034514625050031</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">GENETIC VARIABILITY AND RELATIONSHIPS OF THE THREADED SCULPIN <italic>GYMNOCANTHUS PISTILLIGER</italic> (COTTIDAE)</article-title><trans-title-group xml:lang="ru"><trans-title>ГЕНЕТИЧЕСКАЯ ИЗМЕНЧИВОСТЬ И РОДСТВЕННЫЕ СВЯЗИ <italic>GYMNOCANTHUS PISTILLIGER</italic> (COTTIDAE)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Radchenko</surname><given-names>O. A</given-names></name><name xml:lang="ru"><surname>Радченко</surname><given-names>О. А</given-names></name></name-alternatives><email>mradchenko@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Petrovskaya</surname><given-names>A. V</given-names></name><name xml:lang="ru"><surname>Петровская</surname><given-names>А. В</given-names></name></name-alternatives><email>-</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Biological Problems of the North, Far Eastern Branch of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт биологических проблем Севера Дальневосточного отделения РАН — ИБПС ДВО РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-10-15" publication-format="electronic"><day>15</day><month>10</month><year>2025</year></pub-date><volume>65</volume><issue>5</issue><issue-title xml:lang="en">VOL 65, NO5 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 65, №5 (2025)</issue-title><fpage>542</fpage><lpage>556</lpage><history><date date-type="received" iso-8601-date="2026-01-08"><day>08</day><month>01</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-10-25"/></permissions><self-uri xlink:href="https://snv63.ru/0042-8752/article/view/700401">https://snv63.ru/0042-8752/article/view/700401</self-uri><abstract xml:lang="en"><p>Comparative molecular genetics study was performed for the threaded sculpin <italic>Gymnocanthus pistilliger</italic> from the Sea of Okhotsk, the Sea of Japan, and the Bering Sea. According to the analysis of mitochondrial DNA genes, the species heterogeneity is found, which does not relate to its geographical distribution. <italic>Gymnocanthus pistilliger</italic> is characterized by a closely related relationship with <italic>Gymnocanthus intermedius</italic>, the genetic differentiation between these species is low if considering them different species. The analysis of the obtained results in molecular genetics and morphological data published by other authors, suggest that <italic>G. pistilliger</italic> and <italic>G. intermedius</italic> represent either geographical forms (subspecies) of the same species, or evolutionarily young species.</p></abstract><trans-abstract xml:lang="ru"><p>Проведено сравнительное молекулярно-генетическое изучение <italic>Gymnocanthus pistilliger</italic> из Охотского, Японского и Берингова морей. На основе анализа генов митохондриальной ДНК выявлена гетерогенность вида, не связанная с его географическим распространением. Изученный вид характеризуется близкородственными отношениями с <italic>G. intermedius</italic>, генетическая дифференциация между ними имеет низкий для разных видов уровень. Полученные молекулярно-генетические результаты, а также морфологические данные, приведённые другими авторами, предполагают, что <italic>G. pistilliger</italic> и <italic>G. intermedius</italic> могут представлять собой либо географические формы (подвиды) одного вида, либо эволюционно молодые виды.</p></trans-abstract><kwd-group xml:lang="en"><kwd><italic>Gymnocanthus pistilliger</italic></kwd><kwd><italic>Gymnocanthus intermedius</italic></kwd><kwd>mitochondrial DNA (mtDNA)</kwd><kwd>genetic divergence</kwd><kwd>relationships</kwd></kwd-group><kwd-group xml:lang="ru"><kwd><italic>Gymnocanthus pistilliger</italic></kwd><kwd><italic>Gymnocanthus intermedius</italic></kwd><kwd>митохондриальная ДНК</kwd><kwd>генетическая дивергенция</kwd><kwd>родственные отношения</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа проведена в рамках проекта Российского научного фонда № 25-24-00011 (https://rscf.ru/project/25-24-00011/)</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Дылдин Ю.В., Орлов А.М., Великанов А.Я. и др. 2020. 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