  Vortices can form when finite quantal systems are set to rotate. In the limit
of small particle numbers the vortex formation in a harmonically trapped
fermion system, with repulsively interacting particles, shows similarities to
the corresponding boson system, with vortices entering the rotating cloud for
increasing rotation. We show that for a larger number of fermions,
$N\gtrsim15$, the fermion vortices compete and co-exist with (Chamon-Wen)
edge-reconstructed ground states, forcing some ground states, for instance the
central single vortex, into the spectrum of excited states. Experimentally, the
fermion system could for instance be a semiconductor heterostructure, a quantum
dot, and the corresponding boson system a magneto optical trap (MOT).
