Table 1 Responses of the branchial membrane to suspended sand in mussels from three different locations (in parentheses, %)
Origin of mussels | Number of mussels tested | No response | Positive response | ||
|---|---|---|---|---|---|
Noticeable (+) | Good (++) | Excellent (+++) | |||
Mokbaai | 27 | 9 (33) | 8 (29) | 10 (37) | 0 |
Doove Balg | 29 | 7 (24) | 10 (34.5) | 9 (31) | 2 (6.9) |
Buoy de Koog | 28 | 7 (25) | 14 (50) | 6 (21.4) | 1 (3.6) |