Strongylocentrotus nudus is a dominant sea urchin species in the north west Pacific. They recruit on coralline flats and migrate to kelp forests when one year old or older. Somatic and gonadal growth is supported by brown macroalgae. Strongylocentrotus nudus forms high population densities that can result in over-grazing. Its high growth rate, great longevity, high reproductive efforts, reproduction after a period of maximum feeding, and growth responses to food availability are characteristics of a competitive species.