This work aimed to evaluate the probiotic Lactobacillus spp. in the microbiota of Astyanax bimaculatus reared in a water recirculation system. The experiment was randomized, using 800 postlarvae distributed into eight polyethylene containers, separated into two treatments, in quadruplicate: supplementation with Lactobacillus spp. (Probiotic) and no supplementation (Control). After 90 days of culture, 13 fish per container were anaesthetized. Three of these underwent microbiological evaluation, and haematological analyses were carried out on five. Immunological assessment was performed on another five fish. Zootechnical parameters were evaluated for all animals. In the microbiological evaluation, the probiotic group presented higher counts of lactic acid bacteria, but lower counts of Vibrio spp., Pseudomonas spp., and Staphylococcus spp., when compared with control. After haematological analysis, the supplemented group presented low haematimetric indices of Mean Corpuscular Haemoglobin Concentration and Mean Corpuscular Haemoglobin (MCHC and MCH, respectively) and higher amounts of total leucocytes, thrombocytes and circulating monocytes when compared with control. The immunological profile did not differ between treatments. In the zootechnical performance, probiotic group presented higher productivity, survival and apparent food efficiency when compared with control. Therefore, when Lactobacillus spp. was supplemented in the diet of A. bimaculatus, immunocompetence and the zootechnical performance of animals increased.
K E Y W O R D Shaematology, immunology, Lactobacillus spp., microbiology, yellow tail lambari
O objetivo do trabalho foi avaliar os efeitos nos parâmetros hematológicos eimunológicos de Astyanax bimaculatus alimentados com diferentes frequências naoferta de probiótico. Foram usados um total de 100 animais, foram divididos em 20caixas e 5 tratamentos: 0% (controle), 25%, 50%, 75% e 100% da oferta deprobiótico, em triplicata. Peixes alimentos com 100% de frequência, apresentarammaior números de leucócitos totais, linfócitos e monócitos circulantes que o controle.Trombóticos, eritrócitos e parâmetros hematimétricos e imunológicos não divergiramentre tratamentos. Todos os tratamentos probióticos apresentaram maior contagemde LAB em comparação ao grupo controle. A frequência do fornecimento deprobióticos interfere no perfil hematológico.
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