Sustainable aquaculture and restocking of the sea urchin Loxechinus albus will demand a reliable source of highqualityjuveniles. Culture techniques for L. albus must be refined on several levels to scale up to commercial production.In this study, the effects of different natural foods (six algal foods and one animal food) and the feedingfrequency (three regimes: one continuous and two intermittent) on the growth and feeding of L. albus juvenileswith a test diameter of ca. 5 mmbelonging to a single 5-month-old cohort were investigated. Juveniles fed withRhodophyta: Porphyra sp. and Gracilaria chilensis grew significantly faster (wet body weight and test diameter)than those fed other foods, although these food items are not frequently observed in the gut contents ofwild populations.Juveniles fed with Macrocystis pyrifera showed the lowest growth rates.