The Australian Antarctic Division (AAD) has been collecting hydroacoustic data from its ocean going vessels for a number of years. This collection represents all hydroacoustic data gathered since 1990. The data are stored on the AAD Storage Area Network (SAN), and as such are only directly accessible by AAD personnel. Currently a very large volume of data are stored (greater than 2 TB), hence distribution of these data are logistically feasible really only for people with access to the SAN. As well as data, a large amount of documentation is provided - including methods used to collect these data, as well as any products resulting from these data (e.g. papers, reports, etc). In the past, these data have been collected under several ASAC projects, ASAC 357 (Hydroacoustic Determination of the Abundance and Distribution of Krill in the Region of Prydz Bay, Antarctica) and ASAC 1250 (Krill flux, acoustic methodology and penguin foraging - an integrated study) - ASAC_357 and ASAC_1250. As of 2019-12-19 the folders present in the acoustics data directory are: 1990-05_Aurora-Australis_HIMS 1991-01_Aurora-Australis_AAMBER2 1991-10_Aurora-Australis_WOCE91 1992-01_Aurora-Australis_Calibration_Great-Taylors-Bay 1993-01_Aurora-Australis_Calibration_Port-Arthur 1993-01_Aurora-Australis_KROCK 1993-02_Aurora-Australis_Calibration_Mawson 1993-03_Aurora-Australis_WOES-WORSE 1993-08_Aurora-Australis_Calibration_Port-Arthur 1993-08_Aurora-Australis_THIRST 1994-01_Aurora-Australis_SHAM 1994-12_Aurora-Australis_WOCET 1995-02_Aurora-Australis_Calibration_Casey 1995-07_Aurora-Australis_HI-HO_HI-HO 1996-01_Aurora-Australis_BROKE 1996-01_Aurora-Australis_Calibration_Port-Arthur 1996-02_Aurora-Australis_Calibration_Casey 1996-08_Aurora-Australis_WASTE 1997-01_Aurora-Australis_BRAD 1997-09_Aurora-Australis_ON-ICE 1997-09_Aurora-Australis_WANDER 1997-11_Aurora-Australis_SEXY 1997-11_Aurora-Australis_V3 1997-98-050_V5 1998-02_Aurora-Australis_SNARK 1998-04_Aurora-Australis_PICCIES 1998-07_Aurora-Australis_FIRE-and-ICE 1998-09_Aurora-Australis_V2 1998-10_Aurora-Australis_SEXYII 1999-01_Aurora-Australis_V5 1999-03_Aurora-Australis_STAY 1999-07_Aurora-Australis_Calibration_Port-Arthur 1999-07_Aurora-Australis_IDIOTS 1999-10_Aurora-Australis_V2 1999-11_Aurora-Australis_V4 2000-01_Aurora-Australis_V5 2000-02_Aurora-Australis_V6 2000-10_Aurora-Australis_Calibration_Port-Arthur 2000-11_Aurora-Australis_V1 2000-12_Aurora-Australis_KACTAS 2001-01_Aurora-Australis_Calibration_Mawson 2001-02_Aurora-Australis_Calibration_Davis 2001-10_Aurora-Australis_CLIVAR 2002-01_Aurora-Australis_LOSS 2002-09_Aurora-Australis_V1 2002-10_Aurora-Australis_Calibration_Port-Arthur 2003-01_Aurora-Australis_KAOS 2003-02_Aurora-Australis_Calibration_Mawson 2003-03_Aurora-Australis_Off-charter 2003-09_Aurora-Australis_ARISE 2003-09_Aurora-Australis_Calibration_NW-Bay 2003-11_Aurora-Australis_V2 2003-12_Aurora-Australis_HIPPIES 2004-02_Aurora-Australis_V7 2004-05_AAD_Lab-testing 2004-06_Aurora-Australis_Off-charter 2004-10 2004-10_Aurora-Australis_Calibration_NW-Bay 2004-10_Aurora-Australis_V1 2004-11_Aurora-Australis_V2 2004-11_Howard-Burton_NW-Bay-testing 2004-12_Aurora-Australis_ORCKA 2004-12_Howard-Burton_NW-Bay-testing 2005-02_Aurora-Australis_V5 2005-04_Howard-Burton_Bruny-Island-testing 2005-11_Aurora-Australis_Calibration_Port-Arthur 2005-11_Aurora-Australis_V2 2006-01_Aurora-Australis_BROKE-West 2006-02_Aurora-Australis_Calibration_Mawson 2006-03_Aurora-Australis_V5 2006-09_Aurora-Australis_V1 2006-12_Aurora-Australis_V2 2007-01_Aurora-Australis_SAZ-SENSE 2007-04_Aurora-Australis_V5 2007-08_Aurora-Australis_SIPEX 2011_10_20_Aurora_Calibration 200910_Aurora-Australis_BathymetryProcessing 201803_tankExperiments 20150102_Tangaroa 200708030_Aurora-Australis_V3_CEAMARC 200708040_Aurora-Australis_V4 200708060_Aurora-Australis_V6_CASO 200809000_Aurora-Australis_VTrials 200809010_Aurora-Australis_V1 200809020_Aurora-Australis_V2 200809030_Aurora-Australis_V3 200809050_Aurora-Australis_V5 200910000_Aurora-Australis_VTrials 200910010_Aurora-Australis_V1 200910020_Aurora-Australis_V2 200910030_Aurora-Australis_V3 200910040_Aurora-Australis_V4 200910050_Aurora-Australis_V5 200910070_Aurora-Australis_VE1 201011000_Aurora-Australis_VTrials 201011002_Aurora-Australis_VE2 201011010_Aurora-Australis_V1 201011020_Aurora-Australis_V2 201011021_Aurora-Australis_VMS 201011030_Aurora-Australis_V3 201011040_Aurora-Australis_V4 201011050_Aurora-Australis_V5 201112000_Aurora-Australis_VTrials 201112001_Aurora-Australis_VE1 201112010_Aurora-Australis_V1 201112020_Aurora-Australis_V2 201112030_Aurora-Australis_V3 201112040_Aurora-Australis_V4 201112050_Aurora-Australis_V5 201112060_Aurora-Australis_V6 201213000_Aurora-Australis_VTrials 201213001_Aurora-Australis_VMS_SIPEX 201213010_Aurora-Australis_V1 201213020_Aurora-Australis_V2 201213020_Aurora-Australis_V3 201213040_Aurora-Australis_V4 201314010_Aurora-Australis_V1 201314020_Aurora-Australis_V2 201314040_Aurora-Australis_V4 201314060_Aurora-Australis_V6 201415000_AuroraAustralis-Trials 201415010-AuroraAustralis_V1 201415020_AuroraAustralis_V2 201415030_AuroraAustralis_V3 201415040_AuroraAustralis_V4 201516000-AuroraAustralis_VTrials 201516010_AuroraAustralis_V1 201516020_AuroraAustralis_V2 201516030-AuroraAustralis_V3 201617010-AuroraAustralis_V1 201617020-AuroraAustralis_V2 201617030-AuroraAustralis_V3 201617040-AuroraAustralis_V4 201718010-AuroraAustralis_V1 201718020-AuroraAustralis_V2 201718030-AuroraAustralis_V3 201718040-AuroraAustralis_V4 201819010-AuroraAustralis_V1 201819020-AuroraAustralis_V2 201819030-AuroraAustralis_V3 201819040-AuroraAustralis_V4 201920000-AuroraAustralis_VTrials 201920010-AuroraAustralis_V1 201920011-AuroraAustralis_VMI

Data acquisition Samples were collected at the 3 sites at 9 different depths. Depths included the bottom depth as well as 8 samples in the top 200M. 50ml samples were collected from the niskin bottles attached to the CTD. 20ml was filtered through a 0.02 microlitre filter to remove the viruses and larger organisms from the sample. 1ml of this virus free water was then pipetted into individual cryovials. A further 1ml was then taken from the original seawater sample and was then passed through a 0.2 microlitre filter, which retained all the bacteria and algae. The 0.2 microlitre filter was then placed in the cryovial with the 1ml of virus free seawater. Samples were then fixed with glutaraldehyde (5 microlitre, 50% concentration) at hourly intervals for 4 hours. After fixation samples were placed in liquid nitrogen and later stored at -80 degrees C. All samples will be analysed using a flowcytometer. The fields in these datasets are: Date Leg number Latitude Longitude Subsample Depth (m) Bottle Number Viscosity (cP) This work was completed as part of ASAC projects 2655 and 2679 (ASAC_2655, ASAC_2679).