The data show that unfished populations average ~75% males and ~74% mature animals.
W. Bruce Saunders, Emily Greenfest-Allen, Peter D. Ward 2017, 'Demographic disequilibrium in living nautiloids (Nautilus and Allonautilus): Canaryin the coal mines?', PLOS ONE10.1371/journal.pone.0179811. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)