Navegando por Autor "ALVES, Adriana Xavier"

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Acesso aberto (Open Access)
Efeitos de dietas suplementadas com vitamina e sobre o crescimento, eficiência alimentar e parâmetros hematológicos e fisiológicos do tambaqui Colossoma macropomum (CUVIER, 1818)
(Universidade Federal do Pará, 2016) ALVES, Adriana Xavier; SILVA, Evaldo Martins da; http://lattes.cnpq.br/6649371901290988; VERAS, Galileu Crovatto; http://lattes.cnpq.br/4497651649653210
The vitamin E inclusion in fish food is related to improvements in in growth performance and nonspecific immune response for different species. The present study aimed to evaluate the effect of different vitamin E levels (DL acetate-α-tocopherol, 50% active) on productive performance, hematological variables, hematometric index and physiological parameters of tambaqui (Colossoma macropomum) fingerlings. A total of 150 fishes with an average weight of 2.94 ± 0.14 g and initial average standard length of 4.29 ± 0.07 cm were distributed in aquariums (300 L) in water recirculation system, temperature of 27.13 ± 0.45 ºC, pH 7.16 ± 0.45, dissolved oxygen 7.15 ± 0.88 mg L-1, electronical conductivity 0.142 ± 0.05 (μs cm-1); ammonia 0.00 ± 0.00 (ppm) and nitrite 0.19 ± 0.25 mg L-1. The stocking density was 10 fishes per experimental unity. The inclusion levels of α-tocopherol in the diet were 0, 250, 700 and 1,000 mg kg-1. Thus, was used a completely randomized design with five treatments and three repetitions, where the fishes were fed three times a day during 90 days. The results indicate that the different vitamin E levels did not affect the productive performance of tambaqui fingerlings. However, the inclusion of 1,000 mg kg-1 of α-tocopherol reduced (P<0.05) the glucose amount in comparison to the supplemented treatments with 0 and with 250 mg kg-1. The hematocrit, total protein, erythrocytes number and hematometric index of tambaqui fingerlings were not affected (P>0.05) by α-tocopherol supplementation. In differential leukocyte count, there was no significant difference of lymphocyte number, monocytes and basophiles. However, the neutrophil number was greater in the control treatment (P>0.05), while eosinophil and specials granulocytic cells were better than control treatment (P<0.05), while the eosinophils number was special granulocytic cells was higher than treatments with 700 mg kg-1 and 250 mg kg-1 of α-tocopherol, respectively. Although vitamin E supplementation in the diet did not influence the productive performance of tambaqui fingerlings, the fishes fed diet nonsupplemented showed increased of neutrophils number, demonstrating greater susceptibility of these fishes to inflammation process.
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.