Sea urchins and sea cucumbers form the basis of lucrative fisheries and an expanding commercial aquaculture industry in many parts of the world. Despite their huge potential and considerable interest, commercial aquaculture of these echinoderms is still in its infancy in North America. Little is known about the early stages (larvae/juveniles) of either the purple sea urchin ( Strongylocentrotus purpuratus) or the giant red sea cucumber (Apostichopus californicus), both candidates for aquaculture in British Columbia, Canada. Increasing larval survival and settlement rates and maximizing post-settlement survival and growth are major challenges in the development of juvenile production technology and profitable aquaculture ventures , but t he reliable techniques for hatchery production of echinoderms have been developed for relatively few species. This presentation will focus on various aspects of larval and juvenile production techniques of both the purple sea urchin and giant red sea cucumber. We tested a variety of microalgal diets for larval survival, growth, and settlement. The single- species diet of Dunaliella tertiolecta and the mixed- species diet of D. tertiolecta and Isochrysis galbana supported good growth and survival both for sea urchins and sea cucumbers . The sea cucumber larvae were induced to settle and metamorphose successfully using settlement plates coated with Spirulina and the benthic diatom Amphora salina.