2015-05-112015-05-112014-06VERAS, Galileu Crovatto et al. Efeito do fotoperíodo sobre a composição do filé de juvenis de tilápia do Nilo. Ciência Animal Brasileira, Goiânia, v. 15, n. 2, p. 168-173, abr./jun. 2014. Disponível em: <http://www.scielo.br/pdf/cab/v15n2/a07v15n2.pdf>. Acesso em: 04 maio 2015. <http://dx.doi.org/10.1590/1809-6891v15i22238>.1809-6891https://repositorio.ufpa.br/handle/2011/6648This study aimed to evaluate the effect of the photoperiod on the fillet composition of Nile tilapia juveniles. We employed a completely randomized design with five treatments (0L:24D, 6L:18D, 12L:12D, 18L:6D, 24L:0D) and four replications. We used 160 Nile tilapia juveniles, distributed in 20 tanks containing 20 liters of water, in a recirculation systems, at controlled temperature of 27 ºC and density of eight fish per tank. Fish were fed twice a day with commercial extruded feed containing 40% crude protein. Samples of the fillet at the end of 75 days were collected and stored in a freezer at -80 ºC for subsequent analysis of chemical composition. There was no effect of photoperiod on moisture and ash content of the fillet (P>0.05). The period 18L:6D showed higher amounts of protein in the fillet, as well as lower amounts of fat (P<0.05). Therefore, it can be concluded that the photoperiod can alter Nile tilapia body composition, and the photoperiod 18L:6D contributed to the higher concentration of crude protein and lower fat deposition in Nile tilapia fillets.porAcesso AbertoPeixeTilápia-do-NiloOreochromis niloticusComposição centesimalRetenção de nutrientesArtigo de Periódico