Abstract
VNN is one of the viruses that can cause death in cantang grouper hatchery in Southeast Asia including Indonesia. The purpose of this research was to find out the expression of NFkB in cantang grouper brain which was exposed by VNN and treated by D. salina extract. Fifty hybrid groupers with 7-9 cm length were stocked in 5 containers with a density of 10 fish/container. Five treatments applied with different D. salina extracts are 0, 250, 300, 350 and 400 mg/kg feed. Feed treatment was given twice a day for 10 days before being challenged with VNN. The expression of NFkB was detected with immunohistochemistry tests and analyzed by immunoreaction software. The result showed that the highest NFkB expression is in treatment 0 mg/kg feed with a percentage of 66%, while the lowest expression is shown in 400 mg/kg feed with a percentage of 31,2%. Different dosages of D. salina have a significant effect on NFκB expression so that it can be concluded that D. salina has the potential as a VNN antiviral candidate in the grouper.
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