| Location | Date | Max. density (ind∙l−1) | Temp. (˚C) | Salinity (psu) | Chla (µg∙l−1) |
| Musholm Bay | 10-July | 2.7 | 18.4 | 12.9 | 0.7 |
| Svendborg Sund | 17-June | 12.4 | 15.3 | 15.8 | 3.2 |
| Horsens Fjord | 17-June | 5.7 | 14.8 | 20.4 | 3.2 |