  We perform a systematic analysis of all possible texture zeros in general and
symmetric quark mass matrices. Using the values of masses and mixing parameters
at the electroweak scale, we identify for both cases the maximally restrictive
viable textures. Furthermore, we investigate the predictive power of these
textures by applying a numerical predictivity measure recently defined by us.
With this measure we find no predictive textures among the viable general quark
mass matrices, while in the case of symmetric quark mass matrices most of the
15 maximally restrictive textures are predictive with respect to one or more
light quark masses.
