 Climate change has caused earlier and warmer springs in seasonal environments, leading to increased incidences of extreme weather events. Aquatic environments have been affected by these changes, which can alter the thermal conditions during spawning and the thermal performance of eggs and embryos. These changes can also affect the size of the offspring produced by a given female over time, depending on her size. Larger females produce offspring with more stable performance across temperature ranges, suggesting that maintaining the size distribution of fish populations could help preserve their long-term viability. This article was authored by Marcus Hall, Oscar Nordahl, Anders Forsman, and others.