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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">700404</article-id><article-id pub-id-type="doi">10.7868/S3034514625050062</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">BIOLOGICAL PARAMETERS OF <italic>TRACHURUS MEDITERRANEUS</italic> (CARANGIDAE) OFF THE COAST NEAR SOUTHWESTERN CRIMEA DURING THE PERIOD FROM 2020 TO 2022</article-title><trans-title-group xml:lang="ru"><trans-title>БИОЛОГИЧЕСКИЕ ПАРАМЕТРЫ <italic>TRACHURUS MEDITERRANEUS</italic> (CARANGIDAE) ПРИБРЕЖНОЙ АКВАТОРИИ ЮГО-ЗАПАДНОЙ ЧАСТИ КРЫМА В 2020—2022 ГГ.</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Donchik</surname><given-names>P. I</given-names></name><name xml:lang="ru"><surname>Дончик</surname><given-names>П. И</given-names></name></name-alternatives><email>donchik.1997@ibss-ras.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 Sciences</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="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>590</fpage><lpage>604</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/700404">https://snv63.ru/0042-8752/article/view/700404</self-uri><abstract xml:lang="en"><p>This paper presents the results of a study of the sex and size—age structure, growth, maturation, and dynamics of the gonadosomatic index and condition factor of Mediterranean horse mackerel <italic>Trachurus mediterraneus</italic> (Steindachner, 1868) in the coastal waters of the Black Sea off southwestern Crimea in 2020–2022. A total of 2234 specimens have been studied, 879 of them being sexed. The male-to-female ratio (1.00:1.02) in the catches did not statistically differ from 1:1; no differences in growth rates have been found between the sexes. The maximum total body length is 26.1 cm for an individual aged 8+. Parameters of the von Bertalanffy equation for the whole sample were as follows: asymptotic length, 21.9 cm, asymptotic weight, 86.3 g, and growth constant, 0.24 year<sup>-1</sup>. Fifty percent of females mature at a total body length of 12.43 cm at age 1+ and 50% of males at a total body length of 12.46 cm at the same age. The peak of the spawning period is observed in July and the peak values of the condition factor in November.</p></abstract><trans-abstract xml:lang="ru"><p>Представлены результаты изучения половой и размерно-возрастной структуры, роста, созревания, динамики гонадосоматического индекса и коэффициента упитанности средиземноморской ставриды <italic>Trachurus mediterraneus</italic> (Steindachner, 1868) прибрежной акватории Чёрного моря у юго-западной части Крыма в 2020—2022 гг. Исследовано 2234 экз., у 879 из которых определили пол. Соотношение самцов и самок (1.00 : 1.02) в уловах статистически не отличается от 1 : 1, различий в интенсивности роста между полами не выявлено. Максимальная общая длина тела составляет 26.1 см у особи в возрасте 8+. Параметры уравнения Берталанфи для всей выборки: асимптотическая длина — 21.9 см, асимптотическая масса — 86.3 г, константа роста — 0.24 год<sup>-1</sup>. 50% самок созревают при общей длине тела 12.43 см в возрасте 1+, 50% самцов — при 12.46 см в этом же возрасте. Пик нерестового периода приходится на июль, величины коэффициента упитанности — на ноябрь.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Mediterranean horse mackerel <italic>Trachurus mediterraneus</italic></kwd><kwd>biological parameters</kwd><kwd>growth</kwd><kwd>age</kwd><kwd>maturation</kwd><kwd>gonadosomatic index</kwd><kwd>condition factor</kwd><kwd>mortality</kwd><kwd>Black Sea</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>средиземноморская ставрида <italic>Trachurus mediterraneus</italic></kwd><kwd>биологические показатели</kwd><kwd>рост</kwd><kwd>возраст</kwd><kwd>созревание</kwd><kwd>гонадосоматический индекс</kwd><kwd>коэффициент упитанности</kwd><kwd>Чёрное море</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках государственного задания ИнБЮМ РАН по теме “Биоразнообразие как основа устойчивого функционирования морских экосистем, критерии и научные принципы его сохранения” (№ государственной регистрации 124022400148-4).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Васильева Е.Д. 2007. 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