Effect of diet supplementation with trivalent chromium on Piaractus mesopotamicus (Holmberg, 1887) at different stocking densities. Physiological parameters

Authors

  • Rodrigo Yudi Fujimoto Bolsista de Doutorado (Fapesp proc.: 01/01265-0) - Laboratório de Patologia de Organismos Aquáticos Centro de Aq-­¼icultura da Unesp-Caunesp
  • Marcello Pardi de Castro Laboratório de Patologia de Organismos Aquáticos - Centro de Aq-­¼icultura da Unesp-Caunesp
  • Flávio Ruas de Moraes Bolsista de Produtividade em pesquisa CNPq Laboratório de Patologia de Organismos Aquáticos -  Centro de Aq-­¼icultura da Unesp-Caunesp / Departamento de Patologia Veterinária -  Faculdade de Ciências Agrárias e Veterinárias da Unesp http://orcid.org/0000-0001-6607-8650
  • Flávio Daolio Gonçalves Departamento de Morfologia e Fisiologia animal - Faculdade de Ciências Agrárias e Veterinárias da Unesp

Keywords:

cortisol, glycogen, stress, chromium, Piaractus mesopotamicus

Abstract

The objective of the work was to evaluate the plasmatic cortisol, glycemic and hepatic glycogen levels in juvenile pacu, Piaractus mesopotamicus (Holmberg, 1887), fed diet supplemented and not supplemented with trivalent chromium (0, 6, 12, 18 mg of chromium/kg diet) and maintained at two stocking densities (4 and 20 kg/m3). It can be observed that the fish fed diet without supplementation presented higher plasmatic cortisol concentration than that fed supplemented diet, demonstrating an effect anti-stressing. However, there was not observed any effect (P> 0.01) of the chromium and stocking density on the glycemic values. Fifteen days after the beginning of the experiment, a decrease of the hepatic glycogen in the level of 6 mg chromium/kg and its recovering at the 30th day could be observed. Therefore, in the conditions of the present experiment, the diet supplementation with 18 mg chromium/kg is interesting during the first seven days.

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Published

2018-10-29

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