Hay 137 especies citadas

ANIMALIA/CHORDATA/ACTINOPTERYGII/ACANTHURIFORMES/Sciaenidae
Plagioscion squamosissimus
ANIMALIA/CHORDATA/ACTINOPTERYGII/ATHERINIFORMES/Atherinopsidae
Odontesthes bonariensis
ANIMALIA/CHORDATA/ACTINOPTERYGII/CHARACIFORMES/Acestrorhamphidae
Astyanax abramis
Astyanax lacustris (Astyanax bimaculatus)
Astyanax lineatus
Ctenobrycon kennedyi (Psellogrammus kennedyi)
Moenkhausia dichroura
Psalidodon alleni (Astyanax alleni)
Psalidodon eigenmanniorum (Astyanax eigenmanniorum)
ANIMALIA/CHORDATA/ACTINOPTERYGII/CHARACIFORMES/Anostomidae
Leporellus pictus
Leporinus acutidens
Megaleporinus obtusidens (Leporinus obtusidens)
Schizodon fasciatus
ANIMALIA/CHORDATA/ACTINOPTERYGII/CHARACIFORMES/Characidae
Aphyocharax alburnus
Charax gibbosus
Cheirodon interruptus
Cynopotamus argenteus
Galeocharax humeralis
Odontostilbe microcephala
Odontostilbe paraguayensis
Odontostilbe pequira
Oligosarcus bolivianus
Oligosarcus jenynsii (Oligosarcus jenynsi)
Piabina thomasi (Bryconamericus thomasi)
Pseudocorynopoma doriae (Pseudocorynopoma doriai)
Raphiodon vulpinus
Roeboides affinis (Roeboides prognathus)
Roeboides microlepis (Roeboides bonariensis)
Saccoderma hastatus
Salminus brasiliensis (Salminus maxillosus)
Tetragonopterus argenteus
Triportheus nematurus (Triportheus paranensis)
ANIMALIA/CHORDATA/ACTINOPTERYGII/CHARACIFORMES/Crenuchidae
Characidium cf. zebra (Characidium fasciatum)
ANIMALIA/CHORDATA/ACTINOPTERYGII/CHARACIFORMES/Curimatidae
Cyphocharax platanus
Potamorhina squamoralevis
Psectrogaster curviventris
Steindachnerina brevipinna
Steindachnerina conspersa
ANIMALIA/CHORDATA/ACTINOPTERYGII/CHARACIFORMES/Erythrinidae
Hoplias argentinensis (Hoplias malabaricus)
ANIMALIA/CHORDATA/ACTINOPTERYGII/CHARACIFORMES/Gasteropelecidae
Thoracocharax stellatus
ANIMALIA/CHORDATA/ACTINOPTERYGII/CHARACIFORMES/Parodontidae
Apareiodon affinis
Parodon carrikeri
Parodon nasus (Parodon suborbitale)
Parodon nasus (Parodon tortuosus)
ANIMALIA/CHORDATA/ACTINOPTERYGII/CHARACIFORMES/Prochilodontidae
Prochilodus lineatus
ANIMALIA/CHORDATA/ACTINOPTERYGII/CHARACIFORMES/Serrasalmidae
Mylossoma duriventre
Piaractus mesopotamicus
Pygocentrus nattereri
Serrasalmus marginatus
Serrasalmus spilopleura
ANIMALIA/CHORDATA/ACTINOPTERYGII/CHARACIFORMES/Stevardiidae
Acrobrycon ipanquianus (Acrobrycon tarijae)
Bryconamericus exodon
Bryconamericus iheringii (Bryconamericus iheringi)
Bryconamericus rubropictus
ANIMALIA/CHORDATA/ACTINOPTERYGII/CICHLIFORMES/Cichlidae
Cichlasoma dimerus
Crenicichla lepidota
Gymnogeophagus balzanii
ANIMALIA/CHORDATA/ACTINOPTERYGII/CYPRINIFORMES/Cyprinidae
Ctenopharyngodon laticeps
Cyprinus carpio
ANIMALIA/CHORDATA/ACTINOPTERYGII/CYPRINODONTIFORMES/Anablepidae
Jenynsia alternimaculata
Jenynsia cfr. lineata
Jenynsia lineata (Jenynsia multidentata)
Jenynsia maculata
Jenynsia sp.
ANIMALIA/CHORDATA/ACTINOPTERYGII/CYPRINODONTIFORMES/Poeciliidae
Gambusia affinis
ANIMALIA/CHORDATA/ACTINOPTERYGII/CYPRINODONTIFORMES/Rivulidae
Austrolebias bellottii
Austrolebias vandenbergi (Cynolebias sp.)
Neofundulus paraguayensis
Titanolebias elongatus (Megalebias elongatus)
Trigonectes aplocheiloides
Trigonectes balzanii
ANIMALIA/CHORDATA/ACTINOPTERYGII/GYMNOTIFORMES/Gymnotidae
Gymnotus carapo
ANIMALIA/CHORDATA/ACTINOPTERYGII/GYMNOTIFORMES/Hypopomidae
Brachyhypopomus brevirostris
ANIMALIA/CHORDATA/ACTINOPTERYGII/PLEURONECTIFORMES/Achiridae
Catathyridium jenynsii
ANIMALIA/CHORDATA/ACTINOPTERYGII/SALMONIFORMES/Salmonidae
Oncorhynchus mykiss
ANIMALIA/CHORDATA/ACTINOPTERYGII/SILURIFORMES/Auchenipteridae
Auchenipterus nigripinnis
Auchenipterus osteomystax
Trachelyopterus galeatus
Trachelyopterus striatulus
ANIMALIA/CHORDATA/ACTINOPTERYGII/SILURIFORMES/Callichthyidae
Hoplisoma paleatum (Corydoras paleatus)
Hoplosternum littorale
Hoplosternum thoracatum
Urkumayu micracanthus (Corydoras micracanthus)
ANIMALIA/CHORDATA/ACTINOPTERYGII/SILURIFORMES/Cetopsidae
Pseudocetopsis gobioides
ANIMALIA/CHORDATA/ACTINOPTERYGII/SILURIFORMES/Doradidae
Anadoras weddellii (Anadoras wedelli)
Ossancora eigenmanni (Doras eigenmanni)
Oxydoras kneri
Pterodoras granulosus
Rhinodoras dorbignyi
Trachydoras paraguayensis
ANIMALIA/CHORDATA/ACTINOPTERYGII/SILURIFORMES/Heptapteridae
Heptapterus mustelinus
Imparfinis cochabambae (Pimelodella cochabambae)
Pimelodella gracilis
Pimelodella griffini
Pimelodella laticeps
Rhamdella aymarae
Rhamdia quelen
ANIMALIA/CHORDATA/ACTINOPTERYGII/SILURIFORMES/Loricariidae
Farlowella hahni
Hypostomus borellii
Hypostomus commersoni
Hypostomus cordovae
Hypostomus laplatae
Hypostomus plecostomus
Hypostomus robinii (Hypostomus robini)
Ixinandria steinbachi
Loricaria simillima
Loricariichthys maculatus
Otocinclus vittatus
Pterygoplichthys ambrosettii (Liposarcus anisitsi)
Pyxiloricaria menezesi
Rineloricaria lima
Rineloricaria phoxocephala
Spatuloricaria evansii
Sturisoma barbatum (Sturisoma robustum)
ANIMALIA/CHORDATA/ACTINOPTERYGII/SILURIFORMES/Pimelodidae
Hemisorubim platyrhynchos
Iheringichthys westermanni
Luciopimelodus pati
Megalonema platanum
Paulicea luetkeni
Pimelodus albicans
Pimelodus argenteus
Pimelodus maculatus
Pimelodus ornatus
Pseudoplatystoma corruscans (Pseudoplatystoma coruscans)
Pseudoplatystoma fasciatum
Sorubim lima
Zungaro zungaro (Pseudopimelodus zungaro)
ANIMALIA/CHORDATA/ACTINOPTERYGII/SILURIFORMES/Pseudopimelodidae
Microglanis parahybae
ANIMALIA/CHORDATA/ACTINOPTERYGII/SILURIFORMES/Trichomycteridae
Trichomycterus barbouri
Trichomycterus borellii (Trichomycterus borelli)
Trichomycterus boylei
Trichomycterus roigi
Trichomycterus spegazzinii (Trichomycterus spegazzini)
ANIMALIA/CHORDATA/ACTINOPTERYGII/SYNBRANCHIFORMES/Synbranchidae
Synbranchus marmoratus
ANIMALIA/CHORDATA/CHONDRICHTHYES/MYLIOBATIFORMES/Potamotrygonidae
Potamotrygon brachyura
Potamotrygon falkneri
Potamotrygon motoro

Se citan especies en 2 áreas

Parque Nacional El Rey
Parque Nacional Baritú