This kind of movement leads to some genetic interchange between river systems and is important in maintaining a high degree of genetic homogeneity ("sameness") in Australian bass stocks and preventing speciation. However, this movement has not prevented distinct genetic profiles and subtle morphological ("body shape") differences developing in different river systems. These findings, along with research showing significant differences in seasonal timing of spawning and migration in far south populations stress the importance of using appropriate regional Australian bass stocks for artificial breeding and stocking projects.