Samples were collected from January 2006 to December 2011 between Princess Charlotte Bay (14° 15' S) and Moreton Bay (27° 12' S), on the north-east coast of Queensland, Australia. Fishes were obtained from a fishery-dependent observer programme of a gillnet fishery (Harry et al., 2011). Although sampling occurred year-round, the majority of individuals were collected between the months of September and January. The fishes described in this study are a sub-set of a larger sample (c. 1000 individuals), on which vertebral counts were opportunistically undertaken. Specimen collection was supplemented by direct purchase of fishes from commercial fishers, and through fishery-independent sampling using gillnet and multi-hook drop lines. All samples were collected from water depths <25m, with the exception of a single individual caught from an unknown depth by a prawn trawler. The stretched total length, LST, of individuals was measured in mm and outer clasper length, LClasper, of males was measured as the distance from the tip of the clasper to the pelvic fin (Compagno et al., 2005). Length-at-birth, LSTbirth, and timing of birth were inferred from neonates that were prolific in nearshore habitats during spring and early summer. Neonates were defined as individuals that had recently been born and could be identified as such by the presence of an unhealed umbilical scar during their first few weeks of life (Duncan & Holland, 2006). Precaudal vertebrae counts were taken from the first complete centrum posterior to the chondrocranial occipital centrum, to the centrum anterior to the precaudal pit(Compagno, 1988). This was done by dissection. Eight pregnant females were also identified by PCV counts of their embryos, as this trait was assumed to be inherited and not affected by environment. Embryos were assumed not to be hybrids.