  We present results from an HI counterpart search using the HI Parkes All Sky
Survey (HIPASS) for a sample of low surface brightness galaxies (LSBGs) and
ultradiffuse galaxies (UDGs) identified from the Dark Energy Survey (DES). We
aimed to establish the redshifts of the DES LSBGs to determine the UDG fraction
and understand their properties. Out of 409 galaxies investigated, none were
unambiguously detected in HI. Our study was significantly hampered by the high
spectral rms of HIPASS and thus in this paper we do not make any strong
conclusive claims but discuss the main trends and possible scenarios our
results reflect. The overwhelming number of non-detections suggest that: (A)
Either all the LSBGs in the groups, blue or red, have undergone environment
aided pre-processing and are HI deficient or the majority of them are distant
galaxies, beyond the HIPASS detection threshold. (B) The sample investigated is
most likely dominated by galaxies with HI masses typical of dwarf galaxies. Had
there been Milky Way (MW) size (R_e) galaxies in our sample, with proportionate
HI content, they would have been detected, even with the limitations imposed by
the HIPASS spectral quality. This leads us to infer that if some of the LSBGs
have MW size optical diameters, their HI content is possibly in the dwarf
range. More sensitive observations using the SKA precursors in future may
resolve these questions.
