The Aquafin CRC Salmon Project is being undertaken by CSIRO Marine and Atmospheric Research (CMAR) and Tasmanian Aquaculture and Fisheries Institute (TAFI).Process Study 2 was undertaken between 20-22 September 2005 in the Huon Estuary offshore from Hideaway Bay.During the spatial survey samples were collected from six sites (the same as for PS1) for the analysis of nutrients, dissolved oxygen, phytoplankton species identification, chlorophyll and carotenoid pigments and the absorption coefficients for dissolved (CDOM) particulate (ap) and detrital or non-algal (ad) components of the water column.Three depths were sampled (0, 3 and 3 m from the bottom) as well as a 12 m integrated water column sample. The only exception was dissolved oxygen which was sampled only at two depths (0 and 3 m from the bottom). During this study samples were collected from each of the six sites on two non-consecutive days (20 and 22 April). At each site prior to the collection of the samples a CTD profile to near bottom was collected (Seacat 4550) and the Secchi depth measured. PLEASE NOTE - The phytoplankton results were updated in June 2012 with a correction. The original biovolume unit in column L and M was incorrect and should have been µL/L. The values in column M and L have been divided by 1000 and the unit mL/L left unchanged. Other values are not affected including CPL and Group CPL.