Table 1 Biochemical characteristics of bacterial isolates from Nile tilapia compared with Streptococcus iniae, S. agalactiae and Lactococcus garvieae
Characteristics | S. iniae(Austin and Austin 2012) | S. agalactiae(Austin and Austin 2012) | L. garvieae(Austin and Austin 2012) | Present Isolates | |||
|---|---|---|---|---|---|---|---|
SK | P20 | K10 | M12 | ||||
Gram stain | + | + | + | + | + | + | + |
Shape | Coccus | Coccus | Coccus | Coccus | Coccus | Coccus | Coccus |
Motility | – | – | – | – | – | – | – |
Aerobic growth | + | + | + | + | + | + | + |
Catalase | – | – | – | – | – | – | – |
Oxidase | – | – | – | – | – | – | – |
O/F | F | F | F | F | F | F | F |
Growth at 10°C | – | – | + | + | + | + | + |
Growth at 45°C | – | – | + | – | – | – | – |
Growth at 6.5% NaCl | – | – | + | – | – | – | – |
Blood hemolysis | α/β | -/d | α | β | α | α | α |
Esculin | + | – | + | + | – | – | + |
Lactose | – | – | – | – | – | – | + |
Mannitol | + | – | + | + | + | + | + |
Raffinose | – | – | – | – | – | – | – |
Salicin | + | – | + | + | – | – | + |
Sorbitol | – | – | + | – | – | – | – |
Trehalose | + | – | + | + | – | – | + |
VP test | – | + | + | – | + | + | + |
Glucose | + | + | + | + | + | + | + |
MacConkey Agar | – | – | – | – | – | – | – |