Rimoldi Simona

#acquacoltura

Tecnico Scientifico Laureato, Università degli Studi dell’Insubria

Sessione: NUOVI MENÙ PER I PESCI

Un nuovo mangime per l’orata

Composizione delle comunità microbiche intestinali di orata (Sparus aurata): specchio del valore nutrizionale di diete contenenti fonti proteiche alternative

Simona Rimoldi, Chiara Ascione, Elisabetta Gini, Genciana Terova

Department of Biotechnology and Life Sciences (DBSV), University of Insubria, Via Dunant, 3- 21100 Varese (Italy).

Fish protein hydrolysate, from seafood processing waste, is rich in free amino acids, bioactive compounds and water-soluble proteins that improve feed digestibility and palatability, thus promoting fish growth and feed utilization. Protein hydrolysate from yeast (Saccharomyces cerevisiae), is assumed to have similar beneficial effects of fish protein hydrolysate but, in addition, it contains several immune-stimulating compounds, such as β-glucans and mannan-oligosaccharides, which have positive influence on immune responses and stress tolerance of fish. However, the introduction of any new ingredient in the diet needs to be carefully evaluated since diet is one of the main factors shaping the intestinal microbiota. The gut microbial communities of fish is indicated being correlated with host metabolism, nutrition, growth, immunity, and disease resistance, in a similar way as reported for mammalsConversely, an imbalanced microbiota could negatively affect nutrition and growth and lead to an alteration of the gut immune functions contributing thus to the development of diseases. The present study aimed to investigate the effects of a diet, rich in plant proteins, supplemented with 5% of either fish protein hydrolysate or autolysed dry yeast (HiCell, Biorigin) on intestinal microbiota of gilthead sea bream (Sparus aurata). More than one hundred operational taxonomic units (OTUs) of bacteria were identified in sea bream intestine from more than one million sequences obtained by Illumina MiSeq 16S rRNA gene sequencing. Interestingly, our data revealed that inclusion of autolysed dry yeast was associated with an increased bacterial diversity compared to fish protein hydrolysed supplemented diet. Therefore, autolysed dry yeast, could be a valid alternative protein source for aquafeed production, since it positively affects the intestinal microbial communities of sea bream by increasing the number of indigestible carbohydrate degrading and short chain fatty acid producing bacteria.

Curriculum Vitae

Certificato di internazionalità

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