Relative to the baseline levels at 0 h, A. veronii infection induced statistically significant upregulation (p < 0.05) of the hepatopancreatic chh gene expression in the 0.1 g/kg group, with increases of 34.2% at 24 h and 26.0% at 48 h post-infection, demonstrating early-phase endocrine response modulation. Here, RMRP is linked to infection.