Teraglin (Atractoscion aequidens, family Sciaenidae) are found in eastern Australian waters from southern Queensland to Montague Island. In NSW, teraglin are targeted by the NSW Ocean Trap and Line commercial fishery and by recreational fishers. This is the first study of the life-history characteristics of A. aequidens in NSW and describes the geographical and temporal variation in age, growth, and reproductive characteristics of this species and compares life history parameters with populations in southern Queensland and South Africa. A. aequidens is fast growing reaching approximately 40 - 45 cm FL in the first year of life and can live to 14 years. Preliminary analysis indicates the age at which 50% of the population matures is approximately 1 year old, this is similar to results found in QLD. In South Africa, the same species matures at 90 cm FL and 5 years of age. The commercial fishery in NSW is predominantly based on young fish < 3 years and there are concerns that this species may be subject to unacceptable levels of fishing mortality.