Effect of Dietary Digestible Protein Levels on Muscle Growth and Oxidative Stress in Amazonian Pintado (<i>Pseudoplatystoma reticulatum</i> × <i>Leiarius marmoratus</i>)
Stephane Vasconcelos Leandro | Daniel Rabello Ituassú | Valéria Dornelles Gindri Sinhorin | Danilo Henrique Aguiar | Paula Sueli Andrade Moreira | Ana Julia Lopes Braga Ferneda | Soraia Andressa Dall’Agnol Marques | Adilson Paulo Sinhorin | Anderson Corassa | Ana Paula Silva Ton | Leonardo Willian de Freitas | Maicon Sbardella
This study aimed to evaluate the effects of dietary digestible protein levels on the growth dynamics and oxidative stress status of white muscle fibers in Amazonian Pintado (<i>Pseudoplatystoma reticulatum</i> × <i>Leiarius marmoratus</i>). Four hundred and fifty-five juveniles of Amazonian Pintado were fed diets containing varying digestible protein levels (225, 250, 275, 300, 325, 350, or 375 g kg<sup>−1</sup>) for 75 days. At the end of the experiment, the fish were fasted for 24 h, anesthetized, and euthanized to obtain muscle samples. The linear and quadratic effects of dietary digestible protein levels on white muscle fiber diameter, metabolite concentrations, and oxidative stress were assessed. The results revealed that increasing dietary digestible protein levels linearly raised the concentrations of free amino acids and total proteins in muscle tissue but also led to elevated levels of TBARS, indicating increased oxidative stress. Notably, the average area of muscle fibers with a cell area greater than 1133 µm<sup>2</sup> decreased, reflecting restricted muscle hypertrophy, whereas glycogen and glucose levels also declined. These findings suggest that although high dietary digestible protein enhances protein and free amino acid concentrations in muscle tissue, it may compromise muscle hypertrophy and increase oxidative damage in Amazonian Pintado, underscoring the complexity of optimizing diet formulation.
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