In addition to recognition and immune response mRNAs, other transcripts involved to immune-signalling pathways and adapters were annotated as well as multiple adapter molecules and transcription factors such as, nfkb, myd88, stat6, tollip, jnk, traf, trif and some mapk. This provides a powerful tool for the study of the underlying molecular mechanisms of the eel immune system against infections. This evidence concerns the gene MAPK8 and infection.