With lairs, holes and crevices at differing depths, escape routes for prey, and a combination of light and shadow, an assembly of Tecnoreef modules permits the development of a complex system. This creates a colony for aquatic life in marine or lake environments which have very few natural crevices or which are otherwise sparsely populated. The result is a non-polluting, productive substratum which develops biologically stable structures in very little time. Tecnoreef systems permit the revitalization of excessively exploited ecosystems, repopulating areas which have been deemed in need of such measures by research institutes, repopulation and fishery authorities and recreational diving centres.