francisella piscicida francisella piscicida francisella piscicida is a bacterium present in atlantic cod. it is the causative agent of francisellosis, a serious disease present in norwegian cod farming. francisella piscicida scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: thiotrichales family: francisellaceae genus: francisella species: f. piscicida binomial name francisella piscicidaottem, nylund, karlsbakk, friis-møller, krossøy & knappskog, 2008