Desempenho e hematologia de tilápias-do-nilo alimentadas com Saccharomyces cerevisiae e vacinadas contra Streptococcus agalactiae

Abstract

Resumo -O objetivo deste trabalho foi avaliar a inter-relação entre a suplementação alimentar com parede celular de Saccharomyces cerevisae e a vacinação contra Streptococcus agalactiae e seu efeito sobre o desempenho produtivo e as variáveis hematológicas de tilápia-do-nilo (Oreochromis niloticus). Oitenta e quatro tilápias-do-nilo foram distribuídas em 12 caixas de fibra (n=7), em arranjo fatorial 2x2x3, correspondente a dois níveis de suplementação com parede celular de levedura, dois tipos de inoculação e três tempos de avaliação. Os peixes foram alimentados durante 77 dias. A vacinação dos peixes foi realizada 60 dias após o início da alimentação. Quinze dias após a vacinação, todos os peixes foram submetidos ao desafio com cepa viva de S. agalactiae, e 6, 24 e 48 horas após o desafio, o sangue foi colhido da veia caudal para avaliações. Peixes alimentados com ração suplementada apresentam maior ganho de peso e taxa de crescimento específico, e a interação entre os efeitos da dieta e da vacinação resulta em maiores taxas de hematócrito, hemoglobina e leucócitos.Termos para indexação: Oreochromis niloticus, inflamação, probiótico, sangue, teleósteos, vacinação. Performance and hematological profile of Nile tilapia fed with Saccharomyces cerevisiae and vaccinated against Streptococcus agalactiaeAbstract -The objective of this work was to evaluate the inter-relationship between dietary supplementation with Saccharomyces cerevisiae cell wall and vaccination against Streptococcus agalactiae, and its effect on the productive performance and hematological variables of Nile tilapia (Oreochromis niloticus). Eighty-four Nile tilapia were distributed in 12 fiber boxes (n=7), in a 2x2x3 factorial arrangement, corresponding to two levels of supplementation with yeast cell wall, two types of inoculation, and three evaluation times. Fish were fed during 77 days. Vaccination of fish was done 60 days after feeding started. Fifteen days after vaccination, all fish were subjected to challenge with live strain of S. agalactiae, and 6, 24, and 48 hours after the challenge, blood was collected from the caudal vein for evaluations. Fish fed with supplemented diets show greater weight gain and specific growth rate, and the interaction between the diet and vaccination effects results in higher hematocrit, hemoglobin, and leukocyte rates.

TILAPIA CULTIVATED IN A LOW-SALINITY BIOFLOC SYSTEM SUPPLEMENTED WITH <i>Chlorella vulgaris</i> AND DIFFERENTS MOLASSES APPLICATION RATES

“…In addition, the values found for mean corpuscular volume (MCV) were higher than those described by Signor et al (2010), Salvador et al (2013) and Tavares-Dias (2015) for Nile tilapia, between 113.4 and 170 fL. This increase in MCV is the first response of fish in order to compensate for the decrease in the number of erythrocytes, by carrying larger amounts of hemoglobin (Tavares-Dias et al, 2002).…”

Stress evaluation in dourado females (Salminus brasiliensis) submitted to two different methods of induced spawning

“…Nevertheless, monocytes number was higher in both experimental groups compared to control as shown in Table 3. This cell type acts in inflammatory responses involving phagocytosis process (Dalmo and Bøgwald, 2008;Salvador et al, 2013). The result demonstrated here point the reproductive induction process in Dourado to be considered an inflammatory stimulus, recruiting monocytes for local tissue, since they are considered primary cells for antigens presenting in teleosts.…”

Wound healing in Piaractus mesopotamicus supplemented with chromium carbochelate and Saccharomyces cerevisiae

“…Inflammation seems necessary for fibroblast recruitment, granulation-tissue formation, and wound vascularization both in mammals and fishes (RICHARDSON et al, 2013). The improvement observed in animals supplemented with S. cerevisiae was attributed to the increased acute inflammation, nonspecific immune response, and better growth performance observed in fish supplemented with different fractions of S. cerevisiae (RODRÍGUEZ et al, 2003;ABDEL-TAWWAB et al, 2008;REQUE et al, 2010;SALVADOR et al, 2012SALVADOR et al, , 2013.…”

“…Supplementation with trivalent chromium increased serum immunoglobulin concentrations (ALKAHEM, 1994), reduced levels of cortisol and glycemia, and restored hepatic glycogen improving acute inflammatory response induced by bacteria (FUJIMOTO et al, 2005;CASTRO et al, 2014aCASTRO et al, , 2014b. Supplementation with S. cerevisiae improved weight gain, growth rate, and disease resistance in tilapia challenged with Aeromonas hydrophila and Streptococcus agalactiae by increasing the innate immune response (ABDEL-TAWWAB et al, 2008;REQUE et al, 2010;SALVADOR et al, 2012SALVADOR et al, , 2013.…”