Preliminary Observations on the Feeding of the Freshwater Stingrays Potamotrygon orbignyi, Potamotrygon scobina and lesiotrygon iwamae (Chondrichthyes: Potamotrygonidae) in the Cotijuba Island Region - Pará - Brazil. Symposium Proceedings International Congress on the Biology of Fish, Manaus, Brazil: 41–52
