  We have studied the Hawking radiation from {\it generalized} rotating and
static $(2+1)$-dimensional BTZ black holes. In this regard, we have benefited
the quantum tunneling approach with WKB approximation and obtained the
tunneling rate of outgoing scalar and spinor particles across the horizons. We
have also obtained the Hawking temperature at the horizons corresponding to the
emission of these particles. It is shown that the tunneling rate and Hawking
temperature of generalized $(2+1)$-dimensional BTZ black holes are different
from ordinary $(2+1)$-dimensional BTZ black holes due to the Noether symmetry.
In other words, the Noether symmetry can change the tunneling rate and Hawking
temperature of the BTZ black holes. This symmetry may cause the BTZ black holes
to avoid of evaporation and its breakdown may start the evaporation.
