the richness of these coastal zones have encouraged migration of human populations to these regions, to benefit from the richness of the land, and the ecosystems that live their. this is not unique to rio de janeiro state, however, as worldwide, even though coastal regions cover less than 20 percent of the planet's surface, more than 45 percent of the world's human population live in them.

the various ecosystems of rio de janeiro's coastal zone, have amongst them a varying rate of biodiversity, some with perfect conditions for the growth of many species, whilst others are more harsh, resulting in a smaller assortment of species. the state's coastal lagoons and estuaries are some of the most fruitful ecosystems, considered as 'breeding systems', due to their excellent conditions for the breeding of various species.