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Parental effects passed from adults to their offspring have been identified as a source of rapid acclimation that may allow marine populations to persist as our surface oceans continue to decrease in pH. Little is known, however, whether parental effects are beneficial for offspring in the presence of multiple stressors. We exposed adults of the oyster Saccostrea glomerata to elevated CO₂ and examined the impacts of elevated CO₂ (control = 392; 856 µatm) combined with elevated temperature (control = 24; 28°C), reduced salinity (control = 35; 25) and reduced food concentration (control = full; half diet) on their larvae. Adult exposure to elevated CO₂ had a positive impact on larvae reared at elevated CO₂ as a sole stressor, which were 8% larger and developed faster at elevated CO₂ compared with larvae from adults exposed to ambient CO₂. These larvae, however, had significantly reduced survival in all …