The effect of microbiome containing Nitrosomonas oligotropha and Nitrobacter winogradskyi bacteria on the breeding of rainbow trout (Onhorhynchus mykiss)

he aim of this study was to use a microbiome enriched with ammonia and nitrite oxidizing bacteria in the rainbow trout RAS system. A bacterial microbiome containing Nitrosomonas oligotropha and Nitrobacter winogradskyi (PAN) was added to a rainbow trout culture system (50 g) in the Aquatic Laboratory of the Fisheries Department of the University of Tehran and its effect on hematological parameters (hemoglobulin, hematocrit, erythrocytes, white blood cells, MCV, MCHC, lymphocytes, monocytes, and neutrophils) and stress (cortisol and glucose) as well as water quality of rainbow trout (Oncorhynchus mykiss) in a completely randomized design. In this experiment, a negative control (NC) group was also included for comparison with the experimental group. The results showed that by using PAN microbiome, the concentration of ammonia and nitrite produced was significantly reduced and as a result, this led to a reduction in stress and a reduction in immune suppression and improved growth. Therefore, the use of this bacterial group in improving the breeding system of rainbow trout is suggested by the rainbow trout breeding system.