Table 1. Sea water dependence of sponge-associated actinobacteria isolated from Geodia barretti and Phakelia ventilabrum (SW, sea water).
| Sponge | Genus | No of isolates | SW-dependent | SW-stimulated | SW-independent |
| Geodia barretti | Nocardiopsis | 1 | 1 | - | - |
| Micromonospora | 15 | 14 | - | 1 | |
| Pseudonocardia | 1 | 1 | - | - | |
| Rhodococcus | 6 | 6 | - | - | |
| Streptomyces | 7 | 1 | 1 | 5 | |
| Phakelia ventilabrum | Nocardiopsis | 1 | 1 | - | - |
| Micromonospora | 33 | 26 | 3 | 4 | |
| Rhodococcus | 3 | 1 | 1 | 1 | |
| Streptomyces | 7 | 3 | 3 | 1 |
Stimulation means faster growth and morphological differentiation.