Snow, J.R. (1963) A method of distuinguishing male bass at spawning time. Progressive Fish-culturist, pp. 49
| Species | Development state | Trait | Primary Data | Secondary Data |
| Micropterus salmoides | Female | Female sexual dimorphism | A gravid female can readily be determined by the distention of the ovarian region of the abdomen and by the swollenn ibflamed vent- immediatly before spawning. No method of distinguishing a ripe male from an unripe, pporly developed, or sterile male or female has been described to date | Present |