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Although body size is a key factor in the establishment of a social hierarchy in other species, its influence on aggression in lambari remains unclear. Moreover, dietary supplementation with L\u2010tryptophan (L\u2010TRP) has shown potential in modulating aggression in fish, warranting investigation in aquaculture contexts. This study aimed to generate an ethogram of aggressive behaviours in yellowtail lambari and assess the effects of body size and L\u2010TRP supplementation on aggression. In the first experiment, direct confrontations between larger and smaller fish revealed that larger individuals exhibited higher frequencies of aggressive behaviour. In the second experiment, fish were fed either a control diet or diets supplemented with L\u2010TRP (0.69 or 1.38\u2009g\/100\u2009g) for 10\u2009days, after which they were subjected to direct confrontation with an intruder. L\u2010TRP supplementation resulted in a reduction in the frequency of some aggressive behaviours. These findings enhance our understanding of aggression in yellowtail lambari and provide insights into improving management and welfare in aquaculture.<\/jats:p>","DOI":"10.1111\/jfb.70129","type":"journal-article","created":{"date-parts":[[2025,7,1]],"date-time":"2025-07-01T04:53:53Z","timestamp":1751345633000},"page":"1352-1363","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["L\u2010<scp>TRP<\/scp> supplementation alters the aggressive behaviour of yellowtail lambari (<scp><i>Astyanax altiparanae<\/i><\/scp>)"],"prefix":"10.1111","volume":"107","author":[{"given":"F\u00e1bio Lopes","family":"Gon\u00e7alez","sequence":"first","affiliation":[{"name":"School of Agricultural and Veterinary Sciences S\u00e3o Paulo State University  S\u00e3o Paulo Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Camila de F\u00e1tima Pereira","family":"de 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