staphylococcus piscifermentans staphylococcus piscifermentans staphylococcus piscifermentans is a gram-positive, coagulase-negative member of the bacterial genus staphylococcus consisting of clustered cocci. this species was originally isolated from fermented fish in thailand. a later study found a strain of s. piscifermentans in dog feces. the species is used in the preparation of fermented foods along with staphylococcus carnosus; both species reduce nitrate and produce ammonia. staphylococcus piscifermentans scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: staphylococcaceae genus: staphylococcus species: s. piscifermentans binomial name staphylococcus piscifermentanstanasupawat et al. 1992