The early stage of the epitaxial growth of SrRu03 deposited on LaA103 by pulsed laser deposition has been studied by atomic force microscopy. After 1 nm, the SrRu03 film surface presents a ripple structure that serves as template for the development of a nano-pattern of flat islands that coalesce anisotropically forming a regular array of "infinite" nanowires at a thickness of 12 nm. With increasing thickness, the nanowires coarse and the surface row symmetry disappears for thicknesses higher than 20 nm. The lattice mismatch has been determined and the influence of the resulting stress on the evolution of the SrRu03 surface will be discussed.