2024-02-052024-02-052023-12-15FERREIRA, Jhulie Carolline Sousa. Efeito do incremento L-Triptofano e bactéria probiótica autóctone no comportamento agonístico de alevinos de Heros severus. Orientador: Keber Santos Costa Junior, Coorientador: Carlos Alberto Martins Cordeiro. 2023. 37 f. Trabalho de Curso (Graduação em Engenharia de Pesca) – Faculdade de Engenharia de Pesca. Instituto de Estudos Costeiros, Campus Universitário de Bragança, Universidade Federal do Pará, Bragança-PA, 2023. Disponível em: https://bdm.ufpa.br/jspui/handle/prefix/6723. Acesso em: .https://bdm.ufpa.br/jspui/handle/prefix/6723Animal behavior is fundamental to the viability of an aquaculture enterprise, considering that agonistic behaviors can lead to high mortalities in ornamental aquaculture. With this in mind, this work aimed to evaluate the agonistic behavior of Heros severus fry, supplemented with L-tryptophan and Enterococcus faecium (autochthonous probiotic). The experiment was carried out with treatments C+ (positive control, with feed supplemented with MRS Broth culture medium), C- (negative control, with feed supplemented with tryptophan dilution medium), T1 (treatment with E. faecium supplementation at 108 UFC.g-1 ), T2 (treatment with 2.5% L-tryptophan supplementation) and T3 (treatment with E. faecium and L-tryptophan supplementation). The fish were distributed in 10 aquariums with central Styrofoam dividers, carried out with four replications, each repetition with 5 individuals. Video recordings lasting 15 minutes were made during the mornings, evaluating the agonistic behavior of the fish (tail/body beating, holding with the mouth, biting, hunting, approaching, submissiveness and escape). The data were subjected to the normality test and subsequently processed in PERMANOVA, distributed and nMDS, with the 30-day and weekly averages. The degree of similarity obtained by the nMDS distribution throughout the experimental period showed a small similarity between the behavioral patterns of the evaluated treatments, differing between the control groups (C+ and C-) and the T1, T2 and T3 treatments, presenting less agonistic behaviors and more agonistic behaviors, respectively. Evaluating the data in relation to time (weekly) we can see the similarity of the agonistic behavior patterns remaining over the weeks, however there is a significant change in the vectors, explaining a drastic change in the correlation of individual behavior patterns. Supplementation of E. faecium and L-tryptophan at concentrations of 1x108 and 2.5%, respectively, decreased the presence of agonistic behaviors during the experimental period.Acesso AbertoComportamento animalalimentaçãosuplementaçãopsicobióticoAnimal behaviorfood managementadditivepsychobioticCNPQ::CIENCIAS AGRARIAS::RECURSOS PESQUEIROS E ENGENHARIA DE PESCA::AQUICULTURATrabalho de Curso - Graduação - Monografia