Rising marine temperatures and increasingly frequent and intense marine heatwaves (MHWs) driven by climate change are impacting fish growth worldwide. These effects are particularly concerning for overexploited populations, highlighting the need to understand how growth in key target fisheries species, like the southern sand flathead (Platycephalus bassensis), may respond. To observe growth responses in sand flathead from around Tasmania, one of the quickest warming marine areas worldwide the widths of otolith growth increments were used to develop otolith chronologies. Otolith growth responses for sand flathead from different regions around Tasmania were synchronous and were significantly correlated (p < 0.05) for regions along the east coast, suggesting a strong influence of the warming effect of the East Australian Current extension into Tasmanian waters. Annual mean increments in sand flathead had a significant positive relationship with autumn sea surface temperature (SST) anomalies (coefficient of relationship = 0.0122; p-value < 0.05). Here, we expand the existing literature on growth responses in fish to climate change, with some results mirroring findings in the literature (e.g. correlation with SST parameters). Differences in growth responses for sand flathead populations around Tasmania highlights the need for localised studies, as populations across regions might not be influenced in the same way by larger-scale environmental changes under climate change.