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The synergistic effect of the probiotic Brevibacillus brevis and the Yersinia ruckeri vaccine on growth performance, blood factors, and immunity in rainbow trout (Oncorhynchus mykiss) fry
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Amin Adel1   , Farid Firouzbaksh1 * , Khosrow Janikhalili1 |
| 1- Department of Fisheries, Faculty of Animal Sciences and Fisheries, Sari Agricultural Sciences and Natural Resources University (SANRU), Sari, Iran , f.firouzbakhsh@sanru.ac.ir |
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Abstract: (46 Views) |
The aim of the present study was to investigate the synergistic effect of the probiotic Brevibacillus brevis and the Yersinia ruckeri vaccine on growth performance, blood factors, and immunity in rainbow trout (Oncorhynchus mykiss) fry. A total of 1800 rainbow trout fry with an approximate weight of 3.13±0.30 grams were purchased and randomly distributed into eighteen 300-liter tanks after weighing. Six experimental treatments included a control group (without vaccine and probiotic), unvaccinated fish with 0.05% probiotic, unvaccinated fish with 0.1% probiotic, vaccinated fish without probiotic, vaccinated fish with 0.05% probiotic, and vaccinated fish with 0.1% probiotic. Results after 8 weeks showed that final weight, percentage weight gain, specific growth rate, and feed efficiency improved in the vaccinated groups with 0.05% probiotic (P<0.05). The highest number of white and red blood cells was observed in vaccinated fish fed 0.05% probiotic (p>0.05); whereas, unvaccinated fish with 0.1% probiotic demonstrated the lowest values (p>0.05). Additionally, the vaccine combined with 0.05% probiotic led to an increase in hemoglobin concentration and lymphocyte count (p>0.05). Lysozyme and ACH50 activity were enhanced in vaccinated fish fed 0.05% probiotic (P<0.05). Immunoglobulin levels in vaccinated fish with or without 0.05% probiotic were significantly higher than the other experimental groups (P<0.05). Overall, it seems that probiotics enhanced the effect of the Yersinia ruckeri vaccine in rainbow trout and showed synergistic effects on growth, some blood parameters, and immunity at the level of 0.05%.
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| Keywords: immune stimulation, vaccination, sustainable aquaculture, antigen, beneficial bacteria: immune stimulation, vaccination, sustainable aquaculture, antigen, beneficial bacteria |
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Type of Study: Research |
Subject:
Special
Received: 2025/05/18 | Accepted: 2025/06/7
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