Growth and hematological and immunological responses of Arapaima gigas fed diets supplemented with immunostimulant based on Saccharomyces cerevisiae and subjected to handling stress.
2020
DIAS, M. K. R. | YOSHIOKA, E. T. O. | RODRIGUEZ, A. F. R. | RIBEIRO, R. A. | VIANA, F. S. E. D. | OZÓRIO, R. O. A. | TAVARES-DIAS, M. | MARCIA KELLY REIS DIAS, UNIFAP. PPG em Biodiversidade Tropical; ELIANE TIE OBA YOSHIOKA, CPAF-AP; ANSELMO FORTUNATO RUIZ RODRIGUEZ, UFAC; RICARDO AMARAL RIBEIRO, UFAC; FERNANDO SÉRGIO ESCÓCIO DRUMMOND VIANA, UFAC; RODRIGO OTÁVIO ALMEIDA OZÓRIO, CIIMAR; MARCOS TAVARES DIAS, CPAF-AP.
Saccharomyces cerevisiae is rich in bioactive ingredients and nutrients such as essential amino acids, peptides, cell wall carbohydrates, nucleotides and B vitamins. Diets with this immunostimulant product may offer improves in growth performance and immune of farmed fish. This study evaluated the effects of a commercial immunostimulant based on S. cerevisiae on growth performance, hematology and immunity of Arapaima gigas subjected to handling stress after 30 days of supplementation (0, 4, 6 and 8 g kg−1). Diet with 6 and 8 g kg−1 of immunostimulant increased final biomass, final length, body weight gain, daily weight gain, daily feed intake, specific growth and decreased the cholesterol levels. After handling stress, supplemented fish with 4, 6 and 8 g kg−1 of immunostimulant had increase in glucose levels and decrease in globulin levels, while supplemented fish with 4 and 6 g kg−1 had decrease in cholesterol, and supplemented fish with 4 and 8 g kg−1 in globulin levels. Protein levels decreased in supplemented fish with 4 g kg−1, while hematocrit decreased in all treatments and lymphocytes number and burst respiratory of leukocytes decreased in supplemented fish with 8 g kg−1 and submitted to handling stress. For A. gigas, since 6 to 8 g kg−1 of immunostimulant has not negative impacts on the hematological and biochemical parameters, thus such concentrations may be used as a growth promoter in A. gigas.
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