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We present the HI eXtreme (HIX) galaxy survey targeting some of the most HIrich galaxies in the southern hemisphere. The 13 HIX galaxies have beenselected to host the most massive HI discs at a given stellar luminosity. Wecompare these galaxies to a control sample of average galaxies detected in theHI Parkes All Sky Survey (HIPASS, Barnes et al. 2001). As the control sample ismatched in stellar luminosity, we find that the stellar properties of HIXgalaxies are similar to the control sample. Furthermore, the specific starformation rate and optical morphology do not differ between HIX and controlgalaxies. We find, however, the HIX galaxies to be less efficient in formingstars. For the most HI massive galaxy in our sample (ESO075-G006, $\rm log\M_{HI}\ [M_{\odot}] = 10.8$) the kinematic properties are the reason forinefficient star formation and HI excess. Examining the Australian TelescopeCompact Array (ATCA) HI imaging and Wide Field Spectrograph (WiFeS) opticalspectra of ESO075-G006 reveals an undisturbed galaxy without evidence forrecent major, violent accretion events. A tilted-ring fit to the HI disctogether with the gas-phase oxygen abundance distribution supports the scenariothat gas has been constantly accreted onto ESO07-G006 but the high specificangular momentum makes ESO075-G006 very inefficient in forming stars. Thus amassive HI disc has been built up.

The HIX galaxy survey I: Study of the most gas rich galaxies from HIPASS