Evidence of polygamy in the socially monogamous Amazonian fish Arapaima gigas (Schinz, 1822) (Osteoglossiformes, Arapaimidae)

by Izeni Pires Farias, Adam Leão, Yane Santos Almeida, Júlia Tovar Verba, Marcelo Crossa M., Alexandre Honczaryk, Tomas Hrbek