Knowing the life history parameters of a species is essential to projecting productivity and effective management of a fished species. Here, we investigate changes in estimates of several life history parameters for mackerel icefish (Champsocephalus gunnari) between 1997-2024 around Heard Island and McDonald Islands. All explored life history parameters showed some level of variability throughout the investigated time series. Estimated length at 50% maturity showed an increase in size for both males and females, and estimated length at age increased over the years.