The organic matter and protein content (reported in the literature,
Table 1) were higher in Porphyra sp. and G. chilensis than in other
foods. However, M. pyrifera showed lower values. Both organic matter
and protein content in foods have been highly associated with most
growth parameters in juveniles of different species of sea urchin Several
studies with artificial diets indicate that protein levels of 16%–25% are
optimal for somatic growth of small Lytechinus variegatus