CASP9 and infection: In total, seven genes were identified as highly upregulated upon infection, Casp9, Prkcb1, Hspa5, Radd45a, Dusp7, Rac1, and Casp1. Contrarily, four genes were highly downregulated in response to A. hydrophila infection, Map3k12, Crkl, Jun, and Raf1 (Additional file 6, Table S6).