Nielsen zeta function, 3-manifolds, and asymptotic expansions in Nielsen theory

We prove that the Nielsen zeta function is a rational function or a radical of a rational function for orientation- preserving homeomorphisms on closed orientable 3-dimensional manifolds which are special Haken or Seifert manifolds. In the case of pseudo-Anosov homeomorphism of surface we compute an asymptotics for the number of twisted conjugacy classes or for the number of Nielsen fixed point classes whose norm is at most $x$.