The ornamental ichthyofauna of the Maicurú and Curuá River drainages in the Calha Norte of Pará was studied with the aim of contributing to the knowledge of the fauna in stream and river environments in this region. Three sampling campaigns were conducted, encompassing the Amazon seasonal cycle (drought and flood). The first and second campaigns took place in January 2020 (drought) and December 2020 (drought), respectively. The third campaign occurred in July 2021 (flood). It revealed through the inventory that the order of greatest abundance was Characiformes, followed by Siluriformes, and the most representative species divided into: Characidae (24) followed by Loricariidae (10) and Cichlidae (10), and in total 12,865 individuals of species categorized as ornamental were recorded. The richness, abundance, diversity and dominance indices revealed significant values in the stream habitat, of the species recorded Hemigrammus bellottii, Hyphessobrycon copelandi and Hemigrammus ocellifer were the most abundant. The Venn Diagram showed that of the 92 species recorded, 29 species occurred in the igarapé environment and 27 in the river environment. A total of 15 species were observed with great potential in the ornamental market: Hyphessobrycon copelandi, Moenkhausia oligolepis, Corydoras aeneus, Corydoras ornatus, Corydoras armatus, Corydoras trilineatus, Farlowella amazonum, Peckoltia vittata, Pterygoplichthys pardalis, Rineloricaria lanceolata, Rineloricaria formosa, Rineloricaria castroi, Colomesus asellus, Carnegiella marthae and Carnegiella strigata. Both types of environments harbor a great wealth of ornamental species, and the recording of several of them with potential commercial interest is a positive factor for economic development in the region.
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