{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T07:47:39Z","timestamp":1782373659177,"version":"3.54.5"},"reference-count":64,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T00:00:00Z","timestamp":1782345600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"\u201cInnovation Yanjing 2035\u201d Key R&D Programme of Ningbo","award":["No. 2025Z098"],"award-info":[{"award-number":["No. 2025Z098"]}]},{"name":"Major Agricultural Technology Cooperation Plan of Zhejiang Province","award":["2024ZDXT17"],"award-info":[{"award-number":["2024ZDXT17"]}]},{"name":"Zhejiang Marine Fisheries Research Institute","award":["No. HYS-ZX-202409"],"award-info":[{"award-number":["No. HYS-ZX-202409"]}]},{"name":"Plan Project of Xiangshan County Science and Technology","award":["2025C1002"],"award-info":[{"award-number":["2025C1002"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Animals"],"abstract":"<jats:p>Body size is a key determinant of agonistic interactions in swimming crabs. This study quantified agonistic interactions during pairwise contests among different size classes. Four size classes of male juveniles, Portunus trituberculatus, were examined (extra-large: 70.16 \u00b1 1.12 g; large: 45.07 \u00b1 1.15 g; medium: 25.30 \u00b1 1.19 g; small: 15.08 \u00b1 1.73 g; n = 12 per size class). The frequency and duration of agonistic behaviors and fighting intensity were recorded by a video recording system and analyzed. Larger crabs initiated more frequent and intense aggressive interactions, whereas smaller crabs exhibited mainly avoidance and submissive responses, particularly against larger opponents. The most intense and prolonged contests occurred between opponents with relatively small size differences. Conversely, highly size-mismatched pairs exhibited shorter, less intense interactions. These agonistic interactions were strongly size-dependent, consistent with Resource Holding Potential theory and size-contest dynamics. These behavioral patterns provide insights into social dynamics and inform aquaculture management practices.<\/jats:p>","DOI":"10.3390\/ani16131958","type":"journal-article","created":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T05:48:16Z","timestamp":1782366496000},"page":"1958","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Size-Dependent Agonistic Interaction Patterns in Juvenile Male Swimming Crabs (Portunus trituberculatus)"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-6754-9938","authenticated-orcid":false,"given":"Nahayo","family":"Viateur","sequence":"first","affiliation":[{"name":"College of Fisheries, Zhejiang Ocean University, Zhoushan 316022, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Litao","family":"Wan","sequence":"additional","affiliation":[{"name":"Zhejiang Marine Fisheries Research Institute, Zhoushan 316021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuanyuan","family":"Fu","sequence":"additional","affiliation":[{"name":"Ningbo Institute of Oceanography, Ningbo 315800, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hao","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Fisheries, Zhejiang Ocean University, Zhoushan 316022, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenjun","family":"Xu","sequence":"additional","affiliation":[{"name":"Zhejiang Marine Fisheries Research Institute, Zhoushan 316021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"He","sequence":"additional","affiliation":[{"name":"Zhejiang Marine Fisheries Research Institute, Zhoushan 316021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,6,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"293","DOI":"10.1007\/BF02471782","article-title":"Agonistic behavior: A model, experimental studies, and perspectives","volume":"30","author":"Kudryavtseva","year":"2000","journal-title":"Neurosci. 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