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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">Vestnik of the Far East Branch of the Russian Academy of Sciences</journal-id><journal-title-group><journal-title xml:lang="en">Vestnik of the Far East Branch of the Russian Academy of Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Дальневосточного отделения Российской академии наук</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-7698</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">676063</article-id><article-id pub-id-type="doi">10.31857/S0869769824020109</article-id><article-id pub-id-type="edn">lczmjg</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Biological Sciences</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Биологические науки</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">Evaluation of density and biomass of arctic charr <italic>Salvelinus alpines</italic> (L.) complex (Salmoniformes, Salmonidae) from two oligotrophic lakes in Krasnoyarsk Territory</article-title><trans-title-group xml:lang="ru"><trans-title>Оценка плотности и биомассы арктических гольцов <italic>Salvelinus alpines</italic> (L.) complex (Salmoniformes, Salmonidae) из двух олиготрофных озер Красноярского края</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4258-8765</contrib-id><name-alternatives><name xml:lang="en"><surname>Lobyrev</surname><given-names>Fyodor S.</given-names></name><name xml:lang="ru"><surname>Лобырев</surname><given-names>Федор Сергеевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Candidate of Sciences in Biology, Researcher</p></bio><bio xml:lang="ru"><p>кандидат биологических наук, научный сотрудник</p></bio><email>lobyrev@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет им. М. В. Ломоносова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-04-15" publication-format="electronic"><day>15</day><month>04</month><year>2024</year></pub-date><issue>2</issue><issue-title xml:lang="ru"/><fpage>107</fpage><lpage>122</lpage><history><date date-type="received" iso-8601-date="2025-02-28"><day>28</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-7698/article/view/676063">https://journals.eco-vector.com/0869-7698/article/view/676063</self-uri><abstract xml:lang="en"><p>The paper considers the method of fish density estimation by gill net catches of different mesh size. The method is based on the analysis of the number of fish of different size groups approaching the net by simulating the movement of fish resulting in interaction with the net. The method include technical parameters of the net, morphometric features of fish and their behavioral characteristics. The process of interaction between fish and gill net is splitted into a series of sequential stages, each of which has its own probability calculated. The parameters necessary for the calculation are obtained from the primary analysis of catches and partly from literature data. For abundance estimation, its sensitivity to a number of key model parameters is shown. Density estimates were obtained for Arctic charr <italic>Salvelinus alpinus</italic> (L.) from various locations in Lama and Kapchuk lakes, Krasnoyarsk Territory.</p></abstract><trans-abstract xml:lang="ru"><p>Представлен метод оценки плотности рыб по уловам жаберных сетей разного шага ячеи. Метод основан на анализе количества рыбы разных размерных групп, подходящих к сети, путем моделирования движения рыбы, приводящего к взаимодействию с орудием лова. Метод учитывает технические характеристики сети, морфометрические параметры рыбы и ее поведенческие особенности. Процесс взаимодействия рыбы с орудием лова разбит на ряд последовательных этапов, для каждого из которых рассчитывается своя вероятность. Необходимые для расчета параметры получаются в результате первичного анализа уловов и частично берутся из литературных источников. Для оценки обилия показана ее чувствительность к ряду ключевых параметров модели. Оценка плотности получена для арктических гольцов <italic>Salvelinus alpinus </italic>(L.) из различных точек озер Лама и Капчук Красноярского края.</p></trans-abstract><kwd-group xml:lang="en"><kwd>arctic charr</kwd><kwd>density</kwd><kwd>biomass</kwd><kwd>gill nets</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>арктический голец</kwd><kwd>плотность</kwd><kwd>биомасса</kwd><kwd>жаберная сеть</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This project was founded by the Russian Foundation for Basic Research (Project No. 17-04-00063)</funding-statement><funding-statement xml:lang="ru">Данный проект финансировался Российским фондом фундаментальных исследований (проект № 17-04-00063)</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Izmailova A. V., Korneenkova N. Y. Lake area percentage in Russian Federation Territory and its governing factors. 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