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Context. Pisces A & Pisces B are the only two galaxies found via opticalimaging and spectroscopy out of 22 HI clouds identified in the GALFAHI surveyas dwarf galaxy candidates. Aims. Derive the HI content and kinematics ofPisces A & B. Methods. Aperture synthesis HI observations using the seven dishKaroo Array Telescope (KAT-7), which is a pathfinder instrument for MeerKAT,the South African precursor to the mid-frequency Square Kilometre Array(SKA-MID). Results. The small rotation velocities detected of ~5 km/sec and ~10km/sec in Pisces A & B respectively, and their HI content show that they arereally dwarf irregular galaxies (dIrr). Despite that small rotation component,it is more the random motions ~9-11 km/sec that provide most of thegravitational support, especially in the outer parts. The study of theirkinematics, especially the strong gradients of random motions, suggest thatthose two dwarf galaxies are not yet in equilibrium. Conclusions. These HI richgalaxies may be indicative of a large population of dwarfs at the limit ofdetectability. However, such gas-rich dwarf galaxies will most likely never bewithin the virial radius of MW-type galaxies and become sub-halo candidates.Systems such as Pisces A & B are more likely to be found at a few Mpc.s fromMW-type galaxies.

HI Observations of two New Dwarf Galaxies: Pisces A & B with the SKA Pathfinder KAT-7