The genus Mytilus, is composed by 5 species; M. californianus (Conrad 1837), M. edulis (Linnaeus 1758), M. galloprovincialis (Lamarck 1819), M. trossulus (Gould, 1850) and recently the Mytilus chilensis (Hupe, 1854) species have been confirmed as a true species. In the Chilean coast until 2005 the only Mytilus species present was M. chilensis, however, during the last 15 years two new exotic mussel species have been described (M. edulis and M. galloprovincialis). The scientific literature has described evidence that natural hybridization between the Mytilus species have been occurring in several hybrid zones around the world. If this phenomenon occurs in Chile, could cause a tremendous impact on the biodiversity of marine life and also on the aquaculture industry based on M. chilensis in Chile. The aim of the present study was to determine, under laboratory conditions; the percentage of fecundation using a factorial crosses design with the three species of Mytilus present in Chile.The results obtained, showed that even do significant differences exist among the percentage of fecundation among crosses, there were no significant differences between pure species crosses and the hybrid crosses. Therefore, no prezygotic barrier was found in any of the interspecies crosses. More studies are needed to establish the fitness of larvae and juveniles obtained by each of these crosses, because, even if there is no reproductive barrier between species the viability and survivorship of the juveniles can be affected if these mussels are expose to different environmental conditions.
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