Immunological responses of vaccinated proactive and reactive Nile tilapia (Oreochromis niloticus) subjected to handling stress

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Research Paper 01/01/2019
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Immunological responses of vaccinated proactive and reactive Nile tilapia (Oreochromis niloticus) subjected to handling stress

Jemuel S. Doctolero, Emmanuel M. Vera Cruz
Int. J. Biosci.14( 1), 476-483, January 2019.
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The study was conducted to determine the effect of handling stress application on the immune responses of Nile tilapia vaccinated with formalin-killed Aeromonas hydrophila and to determine which stress-coping styles had better responses. Proactive individuals resemble the bold ones and respond to challenges with high general activity and high levels of aggression while reactive individuals respond to the challenges with immobility and lack of initiative, which resembles the response pattern of the shy. FaST strain of Nile tilapia were screened according to stress-coping style whether proactive and reactive using eye color pattern (ECP) values. Post-vaccination of formalin-killed Aeromonas hydrophila and application of handling stress was administered prior to the commencement of the study. Immune response through hemaaglutination test revealed that proactive individuals had better immune response than reactive individuals as significantly higher agglutination titer was notable among proactive fish. The study concluded that proactive Nile tilapia had better immune stimulation against A. hydrophila upon utilization of formalin-killed vaccine even with the influence of handling stress.


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