Artigos Científicos - IECOS

URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/6575

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Acesso aberto (Open Access)
Efeito do fotoperíodo sobre a composição do filé de juvenis de tilápia do Nilo
(2014-06) VERAS, Galileu Crovatto; MURGAS, Luis David Solis; ZANGERONIMO, Márcio Gilberto; ROSA, Priscila Vieira; MIRANDA, José Rafael; BRABO, Marcos Ferreira
This 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.
Acesso aberto (Open Access)
Fotoperíodo e frequência alimentar na larvicultura do peixe beta
(FEPMVZ Editora, 2016-08) SALES, Abner Dias; VERAS, Galileu Crovatto; BRABO, Marcos Ferreira; ABRUNHOSA, Fernando Araujo; ALVES, Adriana Xavier; DIAS, Bruno César Brito; CAMPELO, Daniel Abreu Vasconcelos; FERREIRA, M.S.S.
The aim of this study was to evaluate the growth, uniformity and survival of Betta splendens larvae, submitted to different photoperiods and feeding frequency. Four hundred and eighty individuals (4.53mg ± 0.32 and 5.51 ± 0.58mm) were randomly distributed into 48 plastic containers (1L) at a density of 10 larvae/L. A completely randomized design was used, with four replications in a factorial 6 x 2, six photoperiods (0L:24D, 6L:18D, 12L:12D, 16L:8D, 20L:4D, 24L:0D) and two feeding frequencies (two or four times a day). The larvae were fed performed with Artemia nauplii at averaging 800/ larvae/ day, for 15 days. Beta larvae subjected to photoperiod 12L:12D and 16L:8E showed the greatest weight gain (P<0.10), while those fed four times daily had greater length growth and uniformity (P<0.10). However, individuals fed four times daily had lower survival when subjected to photoperiod 16L:8E, 20L:4L and 24E:0D (P<0.10). On the other hand, larvae subjected to a photoperiod of 12L:12D, 16L:8L and 20L:4E showed higher survival rate when fed twice a day (P<0.10). Therefore, with the intention of better growth, uniformity and survival of Betta splendens larvae, it is recommended that the hatchery in this species be done under a photoperiod of 12L: 12D with supply of Artemia nauplii twice daily.

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Navegando Artigos Científicos - IECOS por Autor "BRABO, Marcos Ferreira"