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  • Title: Development of protection in rainbow trout (Oncorhynchus mykiss, Walbaum) to Vibrio anguillarum following use of the probiotic Kocuria SM1.
    Author: Sharifuzzaman SM, Austin B.
    Journal: Fish Shellfish Immunol; 2010 Aug; 29(2):212-6. PubMed ID: 20371293.
    Abstract:
    Probiotic Kocuria SM1, which was part of the allochthonous gut microbiota of rainbow trout, was administered to rainbow trout (Oncorhynchus mykiss) fingerlings as dietary supplement at approximately 10(8) cells g(-1) for two weeks. The fish were challenged with Vibrio anguillarum and innate immunity determined over the following 5 weeks. The probiotic-fed fish survived (mortalities = 10-28%; P < 0.05) better than the controls (mortalities = 73-92%) for 5 weeks after stopping administration of Kocuria SM1, although the relative percent survival (RPS) declined steadily from 87 to 36% by the end of the experiment. A significant (P < 0.05) effect on the immune parameters was observed in fish within 3 weeks after stopping administration of Kocuria SM1 in comparison with the controls, i.e. enhancement of the respiratory burst (OD(550nm)) from 0.051 +/- 0.014 to 0.067 +/- 0.009, lysozyme 605 +/- 185 units ml(-1) to 872 +/- 114 units ml(-1), total protein 19.8 +/- 2.0 mg ml(-1) to 23.8 +/- 0.8 mg ml(-1) at 2 weeks, and leukocrit 2.9 +/- 1.8% to 5.1 +/- 1.1%, peroxidase (OD(550nm)) 0.23 +/- 0.02 to 0.37 +/- 0.11 and bacterial killing activities (percentage of surviving bacteria = 82 +/- 12% to 57 +/- 4%) at 3 weeks. Generally, the levels reduced progressively towards the end of experiment.
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