| Test | Neptunomonas sp. BPy-1 | Neptunomonas sp. 0536 |
| Gram | − | − |
| Motility | + | + |
| Oxidase reaction | + | + |
| Cytochrome oxidase | + | + |
| Catalase reaction | + | + |
| NaCl tolerance | 7% (+), 8% (−) | 0.5% - 7% (+) |
| Temperature growth range | 4˚C (−), 37˚C (+), 45˚C (−) | 17˚C - 40˚C (+) |
| Gelatin liquefaction | − | + |
| Maltose assimilation | − | + |
| Glucose acidification | − | + |
| Citrate assimilation | + | − |
| Indole production, nitrate reduction, glucose assimilation, N-acetyl-glucosamine assimilation, arabinose assimilation, mannose assimilation, mannitol assimilation, capric acid assimilation, arginine dihydrolase, urea hydrolysis, esculin hydrolysis, ONPG, potassium gluconate assimilation, adipic assimilation, malate assimilation, phenylacetic acid assimilation | − | − |