Objective.

The aim of this study was to assess the behavior of red tilapia juveniles (Oreochromis sp.) in presence of the possible probiotic microorganisms isolated from the gastrointestinal tract of panche fish (Hypostomus plecostomus).

Materials and methods.

During the phase of assessment of probiotics, 120 red tilapia (Oreochromis sp) juveniles were selected, with average weight of 1.28±0.22 g and average length of 2.99±0.27 cm. Three experimental treatments were formulated taking into account the nourishment needs of red tilapia (Oreochromis sp.). The statistical method employed was a completely random design.

Results.

The three strains of Lactobacillus genus (Lactobacillus plantarum, Lactobacillus pentosus, Lactobacillus rhamnosus) isolated from the digestive tract of H. plecostomus, yielded diverse results in the biometrical variables considered, as well as in the SGR, PER, AE, AC.

Conclusions.

The best rapports regarding the gain in length were for the treatment with native probiotics, and it is deduced that they were easily settled in the intestines of the fish (Oreochromis sp.). It is also determined that there are significant differences in the results or gain in length for the Control Concentrate feed (CC) against Concentrate feed plus Native Probiotic (CNP) for red tilapia (Oreochromis sp.) in the juvenile stag for a 30 day time span.

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