Fig. 1
Bivalve molluscs samples tested and positive for biotoxins
| Bivalve molluscs | Number of samples tested | Number (%) of positive samples | ||
|---|---|---|---|---|
| PSP* | DSP** | ASP*** | ||
| Blue mussel | 55 | 16 (29.1) | 14 (25.5) | 3 (5.5) |
| Japanese carpet shell | 52 | 12 (23.1) | 6 (11.5) | 1 (1.9) |
| Pacific oyster | 42 | 11 (26.2) | 18 (42.9) | 1 (2.4) |
| Razor clam | 29 | 8 (27.6) | 3 (10.3) | 0 |
| Common cockle | 25 | 4 (16.0) | 4 (16.0) | 0 |
| Dog cockle | 24 | 5 (20.8) | 2 (8.3) | 0 |
| Hard clam | 21 | 5 (23.8) | 3 (14.3) | 1 (4.8) |
| Great scallop | 8 | 5 (62.5) | 0 | 4 (50.0) |
| Total | 256 | 66 (25.8) | 50 (19.5) | 10 (3.9) |
Presence of marine biotoxins in bivalve molluscs tested
| Bivalve molluscs (number of positive samples) | PSP (μg/kg)* | DSP (μg/kg)* | ASP (mg/kg)* | ||
|---|---|---|---|---|---|
| Range | Mean ± SD** | Range or content | Mean ± SD | Content | |
| Blue mussel (33) | 51.7–108.5 | 72.6 ± 18.4 | 66–93 | 79.4 ± 8.4 | 0.1; 0.1; 0.5 |
| Japanese carpet shell (19) | 54.2–77.1 | 62.5 ± 7.9 | 67–112 | 83.8 ± 20.0 | 0.2 |
| Pacific oyster (30) | 50.3–128.6 | 72.3 ± 25.8 | 65–112 | 77.1 ± 13.4 | 0.2 |
| Razor clam (11) | 51.0–82.2 | 64.1 ± 10.1 | 72–85 | 79.0 ± 6.6 | - |
| Cockle (8) | 52.97–0.9 | 58.3 ± 8.5 | 70–81 | 75.0 ± 5.83 | - |
| Dog cockle (7) | 51.6–64.3 | 54.7 ± 5.5 | 77; 101 | 89.0 ± 17.0 | - |
| Hard clam (9) | 55.1–90.8 | 67.4 ± 15.8 | 68–81 | 72.3 ± 7.5 | 0.1 |
| Great scallop (9) | 53.9–783.5 | 467.3 ± 314.4 | - | - | 0.2; 0.9; 2.7; 2.7 |
| Range | 50.37– | 83.5 | 65–101 | 0.1–2.7 | |