No, never on a regular basis because (1) it does nothing beneficial, and (2) it does harm all freshwater fish to some degree, soft water species more but all are negatively affected.
Salt as a treatment for "x" disease is a very different issue. Most fish can tolerate salt short-term, as in treating something, but that is very different.
I wrote an article on salt, you may find it useful for the reasons behind the above.