Freshwater mussel of the Hyriidae family indicate potential for a pearl cultivation in the tropical region of Brazil

Fishing for molluscs (eg bivalves and gastropods) is a traditional activity carried out by riverine and coastal families due to the widespread use of fishing resources. The formation of the pearls occurs from a small particle surrounded by concentric layers of mother-of-pearl, firmly in a dense and brilliant materialization. These are classified by "ampolada" or "encistada", formed around a nucleus. The objective of this work was to report records of pearls in freshwater mussel of the Maratauíra river, Abaetetuba, Pará.