Global change has altered the climate and biogeochemistry of oceans, which has cascading consequences across all levels of biological organisation. Under warmer conditions, most fish species develop faster during early life stages but reach smaller adult sizes. At the population level, fish respond to warming by altering the phenology of key events and/or shifting spatial distribution. The interwoven action of these responses...

Decreased body size is often cited as a major response to ocean warming. Available evidence, however, questions the actual emergence of shrinking trends and the prevalence of temperature‐driven changes in size over alternative drivers. In marine fish, changes in food availability or fluctuations in abundance, including those due to size‐selective fishing, provide compelling mechanisms to explain changes in body size. Here, bas...