From the 2-year long M33 time series (Jacquet, 2005), a small peak in NO3 occurs in June, a rather dry month (Caudmont and Maitrepierre, 2007), but no seasonal maximum for SRP and Si is observed. We can conclude from this that a much longer time series is needed in order to remove the inter-annual effect. So far, higher values seem to happen at any particular time of the year, either in the bays (Sainte Marie and Dumbéa) or the middle part of the lagoon (Fichez et al., 2010).