gemmobacter tilapiae gemmobacter tilapiae gemmobacter tilapiae is a gram-negative, rod-shaped, aerobic and non-motile bacterium from the genus of gemmobacter which has been isolated from a freshwater pond in taiwan. gemmobacter tilapiae scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: rhodobacterales family: rhodobacteraceae genus: gemmobacter species: g. tilapiae binomial name gemmobacter tilapiaesheu et al. 2013 type strain bcrc 80261, kctc 23310, strain ruye-53