A peer-reviewed version of this preprint was published in PeerJ on 17 September 2015. View the peer-reviewed version (peerj.com/articles/1270), which is the preferred citable publication unless you specifically need to cite this preprint. Usseglio P, Friedlander AM, DeMartini EE, Schuhbauer A, Schemmel E, Salinas de Léon P. 2015. Improved estimates of age, growth and reproduction for the regionally endemic Galapagos sailfin grouper Mycteroperca olfax (Jenyns, 1840) PeerJ 3:e1270 https://doi.org/10.7717/peerj.1270