| Year | Date | Max. density (ind∙l−1) | Temp. (˚C) | Salinity (psu) | Chla (µg∙l−1) |
| 2008 | 17-July | 3.4 | 16.8 | 16.6 | 1.7 |
| 2009 | 22-June | 4.6 | 14.1 | 20.8 | 0.9 |
| 2010 | 16-July | 3.9 | 20.1 | 13.6 | 2.4 |
| 2011 | 18-May | 7.9 | 10.9 | 14.2 | 1.6 |