Lagoa de Piratininga is a coastal lagoon located in the metropolitan region of Rio de Janeiro, in southeastern Brazil. Part of the Piratininga-Itaipu Lagoon System, this productive brackish-water environment supports an active small-scale fishing community and offers anglers access to a diverse mix of coastal and estuarine species. The lagoon is a dynamic, biologically rich system that has historically supported both subsistence and recreational fishing, with local fishers logging an estimated 900 fishing trips annually and catching an estimated 52.3 tons of fish per year. Individual fishing trips in this system can yield anywhere from 31 to over 72 kilograms of fish, with an average haul of around 54.7 kg per trip — a testament to the lagoon's productivity.