ABSTRACT.
The purpose of this work is to evaluate the relationship between the elemental status and the structural microbiome of fish intestines against the background of the introduction of UDP SiO2 and essential amino acids
complex into the diet of carp (Cyprinus carpio). The analysis of correlation dependence of the main phylogenetic
groups of the intestinal structural microbiome with the indicators of the elemental status of experimental fish showed
the relationship between the content of phosphorus, potassium, calcium and sodium. A significantly significant direct
correlation between the content of essential and conditionally essential elements with Proteobacteria, Fusobacteria,
Campilobacterota, Bacteroidetes, Deinococcus-Thermus, Firmicutes and Campilobacterota was established. Analysis
of the correlation relationship between the accumulation of toxic elements in the carp body with indigeneous intestinal
microflora also revealed a direct relationship with Spirochaetes, Actinobacteria and Verrucomicrobia.
KEYWORDS: fish feeding, micronutrients, microbiome, amino acids
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