This dataset contains the processed Conductivity-Temperature-Depth (CTD) data collected on Franklin voyage FR 04/91. The voyage took place in the Bass Strait and off the NSW coast during 2-23 May 1991. This dataset has been processed and is archived within the CSIRO Marine and Atmospheric Research Data Centre in Hobart. Additional information regarding this dataset is contained in the cruise report for this voyage and/or the data processing report (as available). The salinity data for this voyage had identified as suspect. Following a review by the principal investigators in October 2006, the salnity data has been declared OK.