Photobacterium marinum is a gram-negative, oxidase and catalase positive, motile bacteria of the genus Photobacterium.[1] Photobacterium marinum are commonly found in marine environment. S.I. Paul et al. (2021) isolated, characterized and identified Photobacterium marinum from marine sponges of the Saint Martin's Island Area of the Bay of Bengal, Bangladesh.
Colony, morphological, physiological, and biochemical characteristics of Photobacterium marinum are shown in the Table below.
| Test type | Test | Characteristics |
|---|---|---|
| Colony characters | Size | Medium |
| Type | Round | |
| Color | Creamy | |
| Shape | Convex | |
| Morphological characters | Shape | Rod |
| Physiological characters | Motility | +|-|Growth at 6.5% NaCl|+ |
| Biochemical characters | Gram’s staining | – |
| Oxidase | +|-|Catalase|+ | |
| Oxidative-Fermentative | Oxidative | |
| Motility | +|-|Methyl Red|+ | |
| Voges-Proskauer | – | |
| Indole | +|-|H2S Production|–|-|Urease|V|-|Nitrate reductase|+ | |
| β-Galactosidase | – | |
| Hydrolysis of | Gelatin | +|-|Aesculin|V|-|Casein|V|-|Tween 40|+ |
| Tween 60 | +|-|Tween 80|+ | |
| Acid production from | Glycerol | +|-|Galactose|+|-|D-Glucose|+|-|D-Fructose|V|-|D-Mannose|–|-|Mannitol|V|-|N-Acetylglucosamine|V|-|Amygdalin|+|-|Maltose|V|-|D-Melibiose|+ |
| D-Trehalose | +|-|Glycogen|V|-|D-Turanose|V|}Note: + = Positive; – =Negative; V =Variable (+/–)References |