[en] The fluid approach developed by Hirshman and Shaing to analyze neoclassical transport is used to describe diffusion of particles induced by small stochastic electric and magnetic fluctuations in a nonaxisymmetric toroidal field with well defined average magnetic surfaces. By using the two-lowest moment equations and assuming electrostatic fluctuations, equations for the average particle flow and the average density, as well as for the fluctuations of the particle flow and density around their averages values, are derived. Keeping only the lowest-order terms in the standard expansion, the first set of equations yields the well known ideal equations for the average of these quantities. The first order terms give the radial transport of particles in terms of the dissipation and the correlations of the particle flow and the density fluctuations with the field fluctuations. In order to obtain expressions for the radial particle flow in terms only of the field fluctuations, one should solve the set of equations for the fluctuations of the particle flow and density, in terms of the field fluctuations. A procedure to solve these equations is discussed. 2 refs