  We present the Northern HIPASS Optical/InfraRed CATalogue (NOIRCAT), an
optical/near-infrared counterpart to the Northern HIPASS catalogue (NHICAT). Of
the 1002 sources in NHICAT, 655 (66%) have optical counterparts with matching
optical velocities. A further 85 (8%) sources have optical counterparts with
matching velocities from previous radio emission-line surveys. We find a
correlation between the gas and stellar content of the NOIRCAT sources. Our
HI-selected sample of isolated galaxies also present a wider range in
near-infrared (NIR) colours than previous optically-selected studies of
regular, isolated galaxies. All HI detections in optically unobscured fields
could be matched with either a NED optical counterpart, or a galaxy visible in
POSSII or DSS images. However, as over 200 of these matched galaxies have no
velocity information, further follow-up observations are needed to confirm the
matches, and hence confirm or deny the existence of dark galaxies in this
dataset.
