© 2014 Blackwell Publishing, Ltd. This is the pre-peer reviewed version of the following article: Low interbasin connectivity in a facultatively diadromous fish: evidence from genetics and otolith chemistry, Molecular Ecology, Volume 23, Issue 5, 2014, pages 1000–1013, which has been published in final form at http://dx.doi.org/10.1111/mec.12661.