computer software package. Five- dimensional Lotka-Volterra models were examined: the deterministic type, the Gaussian type in a stochastic version, and the Gaussian-Poissonian type. In addition, by means of MATHEMATICA 4.0 computer programme, formulas were derived making determination of equilibrium stationary points of the five-dimensional Lotka-Volterra system possible. Also, a stability analysis of the received equilibrium points was made in selected cases. As shown by the practice, application area for the given models is rather wide (see also [4]).