2026-09-022026-09-022026-07-21REIS, Lailson Maia Pinheiro. Janela crítica de alimentação: influência do fornecimento tardio de náuplios de Artemia na larvicultura de Pyrrhulina brevis (Steindachner, 1876). Orientador: Leonnan Carlos Carvalho de Oliveira; Coorientadora: Bianca Gomes da Silveira. 2026. 34 f. Trabalho de Curso (Bacharelado em Engenharia de Pesca) – Faculdade de Engenharia de Pesca. Instituto de Estudos Costeiros, Campus Universitário de Bragança, Universidade Federal do Pará, Bragança-PA, 2026. Disponível em: https://bdm.ufpa.br/handle/prefix/10098. Acesso em: .https://bdm.ufpa.br/handle/prefix/10098The consolidation of Amazonian ornamental fish farming depends on the development of larviculture protocols that maximize survival and growth during the first days of life, a stage considered critical for production success. Among the species with potential for this sector, Pyrrhulina brevis stands out due to its ornamental characteristics and commercial interest, although important gaps related to larval feeding management still remain. In this context, the present study aimed to evaluate the impact of delayed Artemia nauplii introduction during the larviculture of P. brevis. A completely randomized design consisting of four treatments and four replicates was used. Larvae were subjected to different delays in Artemia nauplii provision (0, 2, 4, and 6 days after the onset of exogenous feeding) and were subsequently fed until the end of the 20-day experimental period. At the end of the experiment, zootechnical performance and the point of no return (PNR) were evaluated. No significant differences were observed in total length, body weight, uniformity, or Fulton’s condition factor between larvae fed without delay and those subjected to a 2-day delay in Artemia nauplii provision (p > 0.05). However, delays of 4 days or longer resulted in complete larval mortality by the fifth day of the experiment. Larvae fed from the onset of exogenous feeding achieved a survival rate of 86.25%, significantly higher than the 20% survival recorded for larvae subjected to a 2-day delay (p < 0.05). The PNR was estimated at 2.69 days (9.69 days after hatching). These results demonstrate that delaying the introduction of Artemia nauplii severely compromises the survival of P. brevis larvae, highlighting the need to initiate exogenous feeding at an early stage to ensure successful larviculture of this species.Acesso AbertoJejumPresas vivasPiscicultura ornamentalPonto de não retornoFastingLive preyOrnamental fish farmingPoint-of-no-returnCNPQ::CIENCIAS AGRARIAS::RECURSOS PESQUEIROS E ENGENHARIA DE PESCA::ENGENHARIA DE PESCATrabalho de Curso - Graduação - MonografiaAttribution-NonCommercial-NoDerivs 3.0 Brazil