<p dir="ltr">This is the data set in the published paper by Dytnerski et al. on the seasonal metabolic physiology, feeding and energy stores of the sea urchin <i>Diadema setosum</i> in Hong Kong. It includes environmental quality data, field survey data for the abundance (numbers and biomass) of marine algae, seasonal metabolic rates, size, gonad weight, and gonad lipid stores of <i>D. setosum</i>.</p>