The Aquafin CRC Salmon Project is being undertaken by CSIRO Marine and Atmospheric Research (CMAR) and Tasmanian Aquaculture and Fisheries Institute (TAFI). Monthly Monitoring 1 (MM1) was undertaken in the D'Entrecasteaux Channel by CMAR and in the Huon River by TAFI from 10 January 2002 until 31 March 2003. During MM1 samples were collected monthly from 12 sites in the D'Entrecasteaux Channel by CMAR for the analysis of nutrients, phytoplankton species identification, and chlorophyll a; samples were collected for salinity calibration and dissolved oxygen approximately four times a year from 3 sites. In December 2002, samples were collected for HPLC pigment analysis from 5 sites. Samples were collected monthly from 4 sites in the Huon River by TAFI for phytoplankton species identification, nutrients, spectrophotometric chlorophyll a and dissolved oxygen. This metadata record refers to the Monthly Monitoring 1 data collected by CMAR in the D'Entrecasteaux Channel. Two depths were sampled (0 and 1 m from the bottom) for the nutrient analyses, chlorophyll a analysis and dissolved oxygen. A 12 m integrated water column sample was collected for phytoplankton species identification and additionally for chlorophyll a analysis in the first 12 months of the monitoring. In December 2002, samples were collected from surface and bottom from 5 sites for HPLC pigment analysis. At each site prior to the collection of the samples a CTD profile to near bottom was collected using the SBE19-0605 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.