Açude Rosário is a reservoir located in the state of Ceará, in Brazil's semi-arid northeastern region. Like many reservoirs in this part of the country, it sits within a landscape shaped by the challenging climatic conditions of the sertão, where seasonal rainfall patterns and periodic drought cycles heavily influence water levels and aquatic life. The reservoir is notable for its association with net cage aquaculture operations, particularly the cultivation of Nile tilapia, which has been studied in partnership with researchers from the Limnology and Aquaculture Laboratory of the Regional University of Cariri. This academic and practical connection to fish farming gives Açude Rosário a distinctive character among reservoirs in the region.