This record describes the datasets obtained on Courageous Cruise 021. The data were obtained from the Tasman Sea and Bass Strait in June and July 1977. Data were obtained from acoustic and trawl surveys of Jack mackerel (Trachurus declivis) and other demersal and pelagic fish. Length and weight were determined. XBT and hydrological sampling of Eddy "C" was carried out off the NSW coast. Additional information regarding this dataset is contained in the cruise summary for this voyage.(derived from the cruise report) - Biological Field Data Sheets recorded during this voyage have been scanned to PDF, and are available (to CSIRO Staff) on-line. See the details link under "Stored Media List" (below).