Some Tropical and Southern freshwater fishes of the world

Rajaformes
POTAMOTRIGONIDAE

Lepidosireniformes
LEPIDOSIRENIDAE

Osteoglossiformes
OSTEOGLOSSIDAE
NOTOPTERIDAE
MORMYRIDAE
GYMNARCHIDAE

Salmoniformes
GALAXIIDAE

Characiformes
CHARACIDAE
ERYTHRINIDAE
CTENOLUCIIDAE
GASTEROPELECIDAE
CURIMATIDAE
ANOSTOMIDAE

Gymnotoidei
GYMNOTIDAE

Cypriniformes
HOMALOPTERIDAE
COBITIDAE

Siluriformes
BAGRIDAE
CLARIIDAE
TRICHOMYCTERIDAE
ASTROBLEPIDAE
LORICARIIDAE
ASPRIDINIDAE

Cyprinodontiformes
ANABLEPIDAE

Perciformes
NANDIDAE
CICHLIDAE