We consider different mechanisms of large vortices generation by surface waves, which is ibserved in our experiment. Among the considered mechanisms are: i) Direct energy transmission from the surface waves to the large vortice via viscous nonlinear interaction. This transmission is possible if waves with close wave vectors and coinciding frequencies are excited. ii) We consider possible instability for vortices arising at large enough surface wave amplitude. iii) Finally, we consider possibility of inverse cascade, when surface wave excite small scale wortices with sizes order of wavelength. After that the small scale vortices give kinetic energy to the large scale vortices. We discuss the implementation of each of these scenarious.