Özet:

The enhancement population of the world every day brings with it the demand for protein needs. In our study, it was aimed to identify the utilization potential of red pitahaya fruit obtained from Turkey as a natural feed additive. The disc diffusion assay, micro-dilution method for determination of minimum inhibitory (MIC) and minimum bactericidal (MBC) concentration values of the extracts were used to identify the biological activity of the extracts from red pitahaya. The red pitahaya pulp methanol extract against L. garvieae and V. alginolyticus showed 10.61 mm and 7.65 mm of inhibition zone diameters. The methanol extract of red pitahaya peel has 10.18 mm and 11.25 mm inhibition zone diameters on L. garvieae and V. alginolyticus. MIC values were determined as 20 µg/µl and 40 µg/µl for pulp methanol extract and as 80 µg/µl and 40 µg/µl for peel methanol extract against L. garvieae and V. alginolyticus. MBC values of pulp and peel methanol extracts against fish pathogens were determined as 80 µg/µl. As a result, the red pitahaya extracts may have usage potential as natural antimicrobial agents or feed additive in aquaculture.

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