Kim Fournier

1. Introduction Aeromonas salmonicida subsp. salmonicida, a Gram-negative bacterium, exhibits psychrophilic characteristics, thriving optimally at around 18 °C. This subspecies is notably responsible for furunculosis, a disease that predominantly affects salmonid fish []. It is well known that the genome of A. salmonicida subsp. salmonicida includes various plasmids. Usually, the strains of this subspecies carry three small cryptic plasmids (pAsa1, pAsa2, and pAsa3) and a large plasmid named pAsa5 [].