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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="other" 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">650397</article-id><article-id pub-id-type="doi">10.31857/S0042875223030050</article-id><article-id pub-id-type="edn">BYBDBK</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>Unknown</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Age Determination of the Azov Anchovy Engraulis encrasicolus maeoticus (Engraulidae) Based on the Otolith Image Analysis</article-title><trans-title-group xml:lang="ru"><trans-title>Определение возраста азовской хамсы <italic>Engraulis encrasicolus maeoticus</italic> (Engraulidae) на основе анализа изображений отолитов</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Chesalin</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Чесалин</surname><given-names>М. В.</given-names></name></name-alternatives><email>chesalin.mikhail@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences, Sevastopol, Russia</institution></aff><aff><institution xml:lang="ru">Институт биологии южных морей РАН – ИнБЮМ РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-05-01" publication-format="electronic"><day>01</day><month>05</month><year>2023</year></pub-date><volume>63</volume><issue>3</issue><fpage>292</fpage><lpage>301</lpage><history><date date-type="received" iso-8601-date="2025-01-31"><day>31</day><month>01</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, М.В. Чесалин</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, М.В. Чесалин</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">М.В. Чесалин</copyright-holder><copyright-holder xml:lang="ru">М.В. Чесалин</copyright-holder></permissions><self-uri xlink:href="https://transsyst.ru/0042-8752/article/view/650397">https://transsyst.ru/0042-8752/article/view/650397</self-uri><abstract xml:lang="en"><p>To specify the age determination of the Azov anchovy Engraulis encrasicolus maeoticus, the length of otoliths of the age 0+ fish and the radii of annual rings in the otoliths of individuals of different age groups have been analysed. The otoliths of 380 fish caught in the Sea of Azov in October–November 2018 and off the northwestern coast of the Caucasus in February 2019 have been analyzed. The ImageJ software has been used for measuring the maximum otolith length and plotting the reflected light intensity profiles along the length of the otolith transect. In the fingerlings (0+) with an average total length of 70.9 ± 6.7 mm, in October–November, the otolith radius averaged 0.95 ± 0.08 mm, while in February, with an average 66.6 ± 10.6 mm, it was 0.86 ± 0.15 mm. In the smallest fish (48–55 mm), the distance from the core of the otolith to the edge of the white opaque zone varied from 0.54 to 0.72 mm (on average, 0.63 ± 0.04 mm). According to the averaged data, the radii to the center of the dark hyaline zone of otoliths for different age groups of anchovy are: R1, 0.94 ± 0.09; R2, 1.23 ± 0.08; and R3, 1.40 ± 0.07 mm. The present study is aimed at developing automatic methods for determining the age of fish from light intensity profile peaks on otolith images.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181324260352">Для уточнения определения возраста азовской хамсы <italic>Engraulis encrasicolus maeoticus</italic> оценены размеры отолитов сеголеток и радиусы годовых колец в отолитах особей разных возрастных групп. Проанализированы отолиты 380 рыб, отловленных в Азовском море в октябре–ноябре 2018 г. и у северо-западного побережья Кавказа в феврале 2019 г. С применением программы ImageJ измерена наибольшая длина отолита и построены профили интенсивности отражённого света вдоль трансекты по длине отолита. У сеголеток средней абсолютной длиной 70.9 ± 6.7 мм в октябре–ноябре радиус отолитов в среднем составил 0.95 ± 0.08 мм, а в феврале при средней длине рыб 66.6 ± 10.6 мм – 0.86 ± 0.15 мм. У самых мелких сеголеток длиной 48–55 мм расстояние от центра отолита до конца светлой опаковой зоны варьировало от 0.54 до 0.72 (в среднем 0.63 ± 0.04) мм. Радиусы до центра тёмной гиалиновой зоны отолитов для разных возрастных групп хамсы по осреднённым данным составили: <italic>R</italic><sub>1</sub> – 0.94 ± 0.09, <italic>R</italic><sub>2</sub> – 1.23 ± 0.08 и <italic>R</italic><sub>3</sub> – 1.40 ± 0.07 мм. Настоящее исследование направлено на развитие автоматических методов определения возраста рыб по пикам профилей на изображениях отолитов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Azov anchovy</kwd><kwd>Engraulis encrasicolus maeoticus</kwd><kwd>otolith</kwd><kwd>digital imaging</kwd><kwd>age</kwd><kwd>annual ring radius</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>азовская хамса <italic>Engraulis encrasicolus maeoticus</italic></kwd><kwd>отолит</kwd><kwd>обработка цифровых изображений</kwd><kwd>возраст</kwd><kwd>радиус годового кольца.</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Васильков В.П. 1979. Изучение ритмов роста методом математического спектрального анализа склеритограмм чешуи. М.: Изд-во MГУ, 24 с.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Васильков В.П. 2006. Анализ цифровых изображений кальцифицированных структур для оценки возрастных маркеров. 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