Paper summary generated by OpenAI: This study investigates the role of Granzyme K in providing immune protection to Nile tilapia (Oreochromis niloticus) against viral infections. Utilizing a combination of in vivo experiments and molecular analyses, the research demonstrates that Granzyme K enhances the fish’s immune response, leading to improved survival rates following viral exposure. The findings suggest that Granzyme K plays a critical role in the antiviral defense mechanisms of Nile tilapia, highlighting its potential application in aquaculture for disease management.