brachybacterium aquaticum brachybacterium aquaticum brachybacterium aquaticum is a species of gram positive, strictly aerobic, pale yellow-pigmented bacterium. the cells are coccoid during the stationary phase, and irregular rods during the exponential phase. it was first isolated from a seawater sample collected from the coastal region of kovalam, india off the indian ocean. the name is derived from latin aquaticum (living in water). brachybacterium aquaticum scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: micrococcales family: dermabacteraceae genus: brachybacterium species: b. aquaticum binomial name brachybacterium aquaticumkaur et al. 2016 the optimum growth temperature for b. aquaticum is 30 °c, but can grow in the 20-37 °c range. the optimum ph is 8.0 and can grow in ph 7.0-11.0.