  The Fano factor stability diagram of a C$_{3v}$ symmetric triangular quantum
dot is analysed for increasing electron fillings $N$. At low filling,
conventional Poissonian and sub-Poissonian behavior is found. At larger
filling, $N\ge 2$, a breaking of the electron-hole symmetry is manifested in
super-Poissonian noise with a peculiar bias voltage dependence of the Fano
factor at Coulomb and interference blockade. An analysis of the Fano map
unravels a nontrivial electron bunching mechanism arising from the presence of
degenerate many-body states combined with orbital interference and Coulomb
interactions. An expression for the associated dark states is provided for
generic $N$.
