  We study quenched hadron spectra with Wilson fermion in abelian gauge fields
extracted by maximal abelian projection and in fields induced by monopoles on
$16^3 \times 32 $ and $ 12^3 \times 24$ lattices. Pion mass squared and quark
mass defined through the axial Ward identity satisfy the PCAC relation. Gross
features of the light hadron spectra are almost similar to those in SU(3) gauge
fields if normalization is made by the square root of the string tension. It is
also shown that no sizable dynamical mass generation is found in the present
range of $\kappa$ when the monopole degree of freedom is removed from the
abelian fields or from the SU(3) gauge fields.
