The coast of New South Wales is prone to major weather events including extratropical cyclonic conditions in east coast lows (ECL) which are becoming more frequent and severe due to climate change. The ECL in 2022 caused major flooding and freshening of surface sea water. Echinoderms are intolerant of reduced salinity and this ECL caused mass mortality-strandings of Centrostephanus rodgersii. This species has expanded its southward range due to increased ocean temperatures with major impacts on kelp forest ecosystems where its grazing is causing a shift to barrens. While this species has availed of the opportunity to expand due to ocean warming, climate driven decreased salinity events may directly impact the survival of C. rodgersii. We exposed C. rodgersii to reduced salinity conditions that mimic recent flooding events and use weight change, mortality, and neuromuscular coordination measured as righting time to assess resistance to hyposaline stress under acute and chronic acclimation conditions. Coordination decreased at 28ppt seen in increased righting time. Mortality was observed at 26ppt with 100% mortality at 22ppt.