The marking of sea urchins was implemented with the main objective of being able to individually identify the urchins in the natural environment once released; In adition, it’s very useful to monitoring individuals in studies of growth, movements, development, population dynamics, etc., that develop in the natural environment. Numerous different marking methodologies have been tested for sea urchins, either by physical marking (external and internal labels) or by using chemical marking methods consisting of the useof fluorochromes, which adhere to the calcified structures of the urchin.