38kHz Simrad ES60 acoustic data collected during commercial fishing of spawning blue grenadier off the Tasmanian west coast in winter of 2003. Petersen was one of three factory freezer vessels collection acoustic and biological data as part of the FRDC project gt76a. Acoustic data is held by the CSIRO Marine Science Acoustic Group (Hobart). Complementary data sets would be acoustic data collected by vessels FV Aoraki and FV Ocean Dawn as well as biological measures of fish collected by CSIRO and AFMA observers during the 2003 season.