| Order | Family | Species | Occurrence | FishBase name | Name in Country |
|---|---|---|---|---|---|
| Characiformes | Anostomidae | Abramites hypselonotus | native | Marbled headstander | |
| Siluriformes | Doradidae | Acanthodoras cataphractus | native | Spiny catfish | |
| Cichliformes | Cichlidae | Acaronia nassa | native | Bigeye cichlid | |
| Characiformes | Acestrorhynchidae | Acestrorhynchus pantaneiro | native | ||
| Characiformes | Characidae | Acrobrycon ipanquianus | native | ||
| Characiformes | Characidae | Acrobrycon ortii | native | ||
| Characiformes | Characidae | Acrobrycon starnesi | native | ||
| Cichliformes | Cichlidae | Aequidens tetramerus | native | Saddle cichlid | |
| Cichliformes | Cichlidae | Aequidens viridis | native | ||
| Siluriformes | Doradidae | Agamyxis pectinifrons | native | Whitebarred catfish | |
| Siluriformes | Auchenipteridae | Ageneiosus inermis | native | Manduba | |
| Siluriformes | Auchenipteridae | Ageneiosus intrusus | native | ||
| Siluriformes | Auchenipteridae | Ageneiosus vittatus | native | ||
| Characiformes | Triportheidae | Agoniates anchovia | native | ||
| Siluriformes | Aspredinidae | Amaralia hypsiura | native | ||
| Siluriformes | Doradidae | Amblydoras affinis | native | ||
| Characiformes | Crenuchidae | Ammocryptocharax elegans | native | ||
| Cyprinodontiformes | Rivulidae | Anablepsoides beniensis | native | ||
| Cyprinodontiformes | Rivulidae | Anablepsoides bibosi | native | ||
| Cyprinodontiformes | Rivulidae | Anablepsoides chapare | native | ||
| Siluriformes | Doradidae | Anadoras weddellii | native | ||
| Clupeiformes | Engraulidae | Anchoviella carrikeri | native | Carriker's anchovy | |
| Siluriformes | Loricariidae | Ancistrus bolivianus | native | ||
| Siluriformes | Loricariidae | Ancistrus megalostomus | endemic | ||
| Siluriformes | Loricariidae | Ancistrus montanus | endemic | ||
| Siluriformes | Loricariidae | Aphanotorulus emarginatus | native | ||
| Siluriformes | Loricariidae | Aphanotorulus unicolor | native | ||
| Characiformes | Characidae | Aphyocharacidium bolivianum | native | ||
| Characiformes | Characidae | Aphyocharax alburnus | native | Goldencrown tetra | |
| Characiformes | Characidae | Aphyocharax gracilis | native | ||
| Characiformes | Characidae | Aphyocharax nattereri | native | ||
| Cyprinodontiformes | Rivulidae | Aphyolebias claudiae | native | ||
| Cyprinodontiformes | Rivulidae | Aphyolebias obliquus | native | ||
| Cichliformes | Cichlidae | Apistogramma amoena | native | Pleasant cichlid | |
| Cichliformes | Cichlidae | Apistogramma erythrura | native | ||
| Cichliformes | Cichlidae | Apistogramma inconspicua | native | ||
| Cichliformes | Cichlidae | Apistogramma linkei | endemic | ||
| Cichliformes | Cichlidae | Apistogramma luelingi | native | ||
| Cichliformes | Cichlidae | Apistogramma rubrolineata | native | ||
| Cichliformes | Cichlidae | Apistogramma similis | native | ||
| Cichliformes | Cichlidae | Apistogramma sororcula | native | ||
| Cichliformes | Cichlidae | Apistogramma staecki | native | ||
| Gymnotiformes | Apteronotidae | Apteronotus albifrons | native | Black ghost | |
| Siluriformes | Astroblepidae | Astroblepus longiceps | native | ||
| Siluriformes | Astroblepidae | Astroblepus stuebeli | native | ||
| Siluriformes | Doradidae | Astrodoras asterifrons | native | ||
| Cichliformes | Cichlidae | Astronotus crassipinnis | native | ||
| Characiformes | Characidae | Astyanax boliviensis | native | ||
| Characiformes | Characidae | Astyanax chaparae | native | ||
| Characiformes | Characidae | Astyanax multidens | native | ||
| Characiformes | Characidae | Astyanax villwocki | native | ||
| Siluriformes | Auchenipteridae | Auchenipterus ambyiacus | native | ||
| Siluriformes | Auchenipteridae | Auchenipterus brachyurus | native | ||
| Cyprinodontiformes | Rivulidae | Austrolebias accorsii | native | ||
| Siluriformes | Pseudopimelodidae | Batrochoglanis raninus | native | ||
| Beloniformes | Belonidae | Belonion apodion | native | ||
| Cichliformes | Cichlidae | Biotodoma cupido | native | Greenstreaked eartheater | |
| Characiformes | Characidae | Brachychalcinus copei | native | ||
| Gymnotiformes | Hypopomidae | Brachyhypopomus alberti | native | Cuchillo | |
| Gymnotiformes | Hypopomidae | Brachyhypopomus arrayae | native | Cuchillo | |
| Gymnotiformes | Hypopomidae | Brachyhypopomus beebei | native | ||
| Gymnotiformes | Hypopomidae | Brachyhypopomus bennetti | native | ||
| Gymnotiformes | Hypopomidae | Brachyhypopomus brevirostris | native | Bluntnose knifefish | |
| Gymnotiformes | Hypopomidae | Brachyhypopomus pinnicaudatus | native | ||
| Gymnotiformes | Hypopomidae | Brachyhypopomus sullivani | native | ||
| Siluriformes | Pimelodidae | Brachyplatystoma filamentosum | native | Kumakuma | |
| Siluriformes | Pimelodidae | Brachyplatystoma platynema | native | Slobbering catfish | |
| Siluriformes | Pimelodidae | Brachyplatystoma rousseauxii | native | Zungaro dorado | |
| Siluriformes | Pimelodidae | Brachyplatystoma vaillantii | native | Laulao catfish | |
| Siluriformes | Heptapteridae | Brachyrhamdia marthae | native | ||
| Characiformes | Bryconidae | Brycon cephalus | native | ||
| Characiformes | Bryconidae | Brycon melanopterus | native | ||
| Characiformes | Characidae | Bryconacidnus ellisae | native | ||
| Characiformes | Characidae | Bryconacidnus hemigrammus | native | ||
| Characiformes | Characidae | Bryconamericus bolivianus | native | ||
| Characiformes | Characidae | Bryconamericus thomasi | native | ||
| Cichliformes | Cichlidae | Bujurquina beniensis | native | ||
| Cichliformes | Cichlidae | Bujurquina mabelae | native | ||
| Cichliformes | Cichlidae | Bujurquina oenolaemus | native | ||
| Siluriformes | Aspredinidae | Bunocephalus aleuropsis | native | ||
| Siluriformes | Aspredinidae | Bunocephalus coracoideus | native | Guitarrita | |
| Characiformes | Chilodontidae | Caenotropus labyrinthicus | native | ||
| Siluriformes | Callichthyidae | Callichthys callichthys | native | Cascarudo | |
| Siluriformes | Pimelodidae | Calophysus macropterus | native | Zamurito | |
| Cypriniformes | Cyprinidae | Carassius auratus | introduced | Goldfish | |
| Characiformes | Serrasalmidae | Catoprion mento | native | Wimple piranha | |
| Siluriformes | Cetopsidae | Cetopsis candiru | native | ||
| Siluriformes | Cetopsidae | Cetopsis coecutiens | native | ||
| Siluriformes | Cetopsidae | Cetopsis pearsoni | native | ||
| Siluriformes | Cetopsidae | Cetopsis starnesi | native | ||
| Characiformes | Chalceidae | Chalceus guaporensis | native | ||
| Characiformes | Crenuchidae | Characidium bolivianum | native | ||
| Characiformes | Crenuchidae | Characidium heinianum | native | ||
| Characiformes | Crenuchidae | Characidium schindleri | native | ||
| Siluriformes | Pimelodidae | Cheirocerus eques | native | ||
| Cichliformes | Cichlidae | Cichla pleiozona | native | ||
| Cichliformes | Cichlidae | Cichlasoma boliviense | native | ||
| Cichliformes | Cichlidae | Cichlasoma dimerus | native | ||
| Characiformes | Triportheidae | Clupeacharax anchoveoides | native | ||
| Characiformes | Serrasalmidae | Colossoma macropomum | native | Cachama | Pacu |
| Siluriformes | Callichthyidae | Corydoras aeneus | native | Bronze corydoras | |
| Siluriformes | Callichthyidae | Corydoras albolineatus | native | White stripe cory | |
| Siluriformes | Callichthyidae | Corydoras bilineatus | native | White striped cory | |
| Siluriformes | Callichthyidae | Corydoras cruziensis | native | Santa cruz cory | |
| Siluriformes | Callichthyidae | Corydoras geryi | native | Bolivian cory | |
| Siluriformes | Callichthyidae | Corydoras haraldschultzi | native | Mosaic corydoras | |
| Siluriformes | Callichthyidae | Corydoras hastatus | native | Dwarf corydoras | |
| Siluriformes | Callichthyidae | Corydoras isbrueckeri | native | Brazil long nose cory | |
| Siluriformes | Callichthyidae | Corydoras latus | native | Wide cory | |
| Siluriformes | Callichthyidae | Corydoras mamore | native | Marmore cory | |
| Siluriformes | Callichthyidae | Corydoras negro | native | Rio negro cory | |
| Siluriformes | Callichthyidae | Corydoras noelkempffi | native | Meander cory | |
| Siluriformes | Callichthyidae | Corydoras pantanalensis | native | Pantanal cory | |
| Siluriformes | Callichthyidae | Corydoras paragua | native | Paragua cory | |
| Siluriformes | Callichthyidae | Corydoras paucerna | native | Cuddly cory | |
| Siluriformes | Callichthyidae | Corydoras sterbai | native | Sterba's cory | |
| Characiformes | Characidae | Creagrutus beni | native | Goldstripe characin | |
| Characiformes | Characidae | Creagrutus pearsoni | native | ||
| Cichliformes | Cichlidae | Crenicara latruncularium | native | ||
| Cichliformes | Cichlidae | Crenicara punctulata | native | Checkerboard cichlid | |
| Cichliformes | Cichlidae | Crenicichla adspersa | native | ||
| Cichliformes | Cichlidae | Crenicichla johanna | native | ||
| Cichliformes | Cichlidae | Crenicichla lepidota | native | Pike cichlid | |
| Cichliformes | Cichlidae | Crenicichla semicincta | native | ||
| Characiformes | Curimatidae | Curimata roseni | native | ||
| Characiformes | Curimatidae | Curimata vittata | native | ||
| Characiformes | Curimatidae | Curimatella alburnus | native | ||
| Characiformes | Curimatidae | Curimatella dorsalis | native | ||
| Characiformes | Curimatidae | Curimatella immaculata | native | ||
| Characiformes | Curimatidae | Curimatella meyeri | native | ||
| Characiformes | Curimatidae | Curimatopsis macrolepis | native | Shinyscaled curimata | |
| Characiformes | Cynodontidae | Cynodon gibbus | native | ||
| Characiformes | Curimatidae | Cyphocharax notatus | native | ||
| Characiformes | Curimatidae | Cyphocharax plumbeus | native | ||
| Characiformes | Curimatidae | Cyphocharax spiluropsis | native | ||
| Cypriniformes | Cyprinidae | Cyprinus carpio | introduced | Common carp | |
| Gymnotiformes | Sternopygidae | Distocyclus conirostris | native | ||
| Gymnotiformes | Sternopygidae | Eigenmannia virescens | native | Glass knifefish | |
| Siluriformes | Auchenipteridae | Entomocorus benjamini | native | ||
| Siluriformes | Auchenipteridae | Epapterus dispilurus | native | ||
| Siluriformes | Loricariidae | Farlowella altocorpus | native | ||
| Siluriformes | Loricariidae | Farlowella nattereri | native | ||
| Siluriformes | Loricariidae | Farlowella oxyrryncha | native | ||
| Cyprinodontiformes | Poeciliidae | Gambusia affinis | introduced | Mosquitofish | |
| Cichliformes | Cichlidae | Geophagus megasema | native | ||
| Characiformes | Characidae | Gephyrocharax chaparae | native | ||
| Characiformes | Characidae | Gephyrocharax major | native | ||
| Characiformes | Characidae | Gymnocorymbus flaviolimai | native | ||
| Characiformes | Characidae | Gymnocorymbus ternetzi | native | Black tetra | |
| Characiformes | Characidae | Gymnocorymbus thayeri | native | False black tetra | |
| Gymnotiformes | Rhamphichthyidae | Gymnorhamphichthys hypostomus | native | Morse Knifefish | |
| Gymnotiformes | Gymnotidae | Gymnotus carapo | native | Banded knifefish | |
| Gymnotiformes | Gymnotidae | Gymnotus pantanal | native | ||
| Characiformes | Characidae | Hemibrycon beni | native | ||
| Characiformes | Characidae | Hemibrycon jelskii | native | ||
| Siluriformes | Doradidae | Hemidoras boulengeri | native | ||
| Siluriformes | Doradidae | Hemidoras stuebelii | native | ||
| Characiformes | Characidae | Hemigrammus changae | native | ||
| Characiformes | Characidae | Hemigrammus lunatus | native | ||
| Characiformes | Characidae | Hemigrammus neptunus | native | ||
| Siluriformes | Loricariidae | Hemiodontichthys acipenserinus | native | ||
| Siluriformes | Pimelodidae | Hemisorubim platyrhynchos | native | Porthole shovelnose catfish | |
| Cichliformes | Cichlidae | Heros spurius | native | ||
| Characiformes | Erythrinidae | Hoplerythrinus unitaeniatus | native | Aimara | |
| Characiformes | Erythrinidae | Hoplias malabaricus | native | Trahira | |
| Siluriformes | Callichthyidae | Hoplosternum littorale | native | Atipa | |
| Characiformes | Cynodontidae | Hydrolycus scomberoides | native | Payara | |
| Characiformes | Characidae | Hyphessobrycon megalopterus | native | Black phantom tetra | |
| Characiformes | Characidae | Hyphessobrycon pando | native | Pando tetra | |
| Siluriformes | Loricariidae | Hypoptopoma baileyi | native | ||
| Siluriformes | Loricariidae | Hypoptopoma incognitum | native | ||
| Siluriformes | Loricariidae | Hypoptopoma inexspectatum | native | ||
| Siluriformes | Loricariidae | Hypoptopoma thoracatum | native | ||
| Gymnotiformes | Hypopomidae | Hypopygus neblinae | native | ||
| Siluriformes | Loricariidae | Hypostomus bolivianus | native | ||
| Siluriformes | Loricariidae | Hypostomus borellii | native | ||
| Siluriformes | Loricariidae | Hypostomus fonchii | native | ||
| Siluriformes | Loricariidae | Hypostomus levis | native | ||
| Characiformes | Iguanodectidae | Iguanodectes spilurus | native | ||
| Siluriformes | Heptapteridae | Imparfinis cochabambae | endemic | ||
| Siluriformes | Heptapteridae | Imparfinis guttatus | native | ||
| Siluriformes | Heptapteridae | Imparfinis stictonotus | native | ||
| Siluriformes | Loricariidae | Ixinandria steinbachi | native | ||
| Cyprinodontiformes | Anablepidae | Jenynsia alternimaculata | native | Lipeo livebearer | |
| Clupeiformes | Engraulidae | Jurengraulis juruensis | native | Jurua anchovy | |
| Characiformes | Characidae | Knodus longus | native | ||
| Characiformes | Characidae | Knodus mizquae | native | ||
| Characiformes | Characidae | Knodus shinahota | native | ||
| Characiformes | Characidae | Knodus smithi | native | ||
| Characiformes | Anostomidae | Laemolyta fasciata | native | ||
| Cichliformes | Cichlidae | Laetacara dorsigera | native | Redbreast acara | |
| Siluriformes | Loricariidae | Lamontichthys filamentosus | native | ||
| Siluriformes | Pimelodidae | Leiarius marmoratus | native | ||
| Ceratodontiformes | Lepidosirenidae | Lepidosiren paradoxa | native | South American lungfish | |
| Characiformes | Anostomidae | Leporinus bleheri | native | ||
| Characiformes | Anostomidae | Leporinus jamesi | native | ||
| Characiformes | Anostomidae | Leporinus pearsoni | native | ||
| Characiformes | Anostomidae | Leporinus striatus | native | ||
| Characiformes | Anostomidae | Leporinus y-ophorus | native | ||
| Siluriformes | Callichthyidae | Lepthoplosternum beni | native | Tambopata catfish | |
| Siluriformes | Loricariidae | Loricaria luciae | native | ||
| Characiformes | Characidae | Makunaima guianensis | native | ||
| Characiformes | Characidae | Markiana nigripinnis | native | Sardina | |
| Siluriformes | Callichthyidae | Megalechis picta | native | Spotted hoplo | |
| Siluriformes | Callichthyidae | Megalechis thoracata | native | ||
| Siluriformes | Trichomycteridae | Megalocentor echthrus | native | ||
| Siluriformes | Doradidae | Megalodoras uranoscopus | native | ||
| Siluriformes | Pimelodidae | Megalonema amaxanthum | native | ||
| Cyprinodontiformes | Rivulidae | Melanorivulus punctatus | native | ||
| Cichliformes | Cichlidae | Mesonauta festivus | native | Flag cichlid | |
| Characiformes | Serrasalmidae | Metynnis hypsauchen | native | Silver dollar | Pacupeba |
| Characiformes | Serrasalmidae | Metynnis otuquensis | native | ||
| Characiformes | Characidae | Microgenys weyrauchi | native | ||
| Centrarchiformes | Centrarchidae | Micropterus salmoides | introduced | Largemouth black bass | |
| Cichliformes | Cichlidae | Mikrogeophagus altispinosus | native | ||
| Cyprinodontiformes | Rivulidae | Moema beucheyi | native | ||
| Cyprinodontiformes | Rivulidae | Moema funkneri | native | ||
| Cyprinodontiformes | Rivulidae | Moema juanderibaensis | native | Juan Deriba killifish | Juan Deriba killifish |
| Cyprinodontiformes | Rivulidae | Moema pepotei | native | ||
| Characiformes | Characidae | Moenkhausia barbouri | native | ||
| Characiformes | Characidae | Moenkhausia dorsinuda | native | ||
| Characiformes | Characidae | Moenkhausia intermedia | native | ||
| Ovalentaria/misc | Polycentridae | Monocirrhus polyacanthus | native | Amazon leaffish | |
| Characiformes | Characidae | Monotocheirodon pearsoni | native | ||
| Characiformes | Serrasalmidae | Mylossoma albiscopum | native | ||
| Characiformes | Serrasalmidae | Mylossoma aureum | native | Pacupeba | |
| Characiformes | Serrasalmidae | Mylossoma duriventre | native | Pacupeba | |
| Siluriformes | Loricariidae | Nannoptopoma sternoptychum | native | ||
| Characiformes | Lebiasinidae | Nannostomus erythrurus | native | ||
| Characiformes | Lebiasinidae | Nannostomus trifasciatus | native | Threestripe pencilfish | |
| Characiformes | Lebiasinidae | Nannostomus unifasciatus | native | Oneline pencilfish | |
| Siluriformes | Doradidae | Nemadoras humeralis | native | ||
| Cyprinodontiformes | Rivulidae | Neofundulus ornatipinnis | native | ||
| Cyprinodontiformes | Rivulidae | Neofundulus splendidus | native | ||
| Atheriniformes | Atherinopsidae | Odontesthes bonariensis | introduced | Argentinian silverside | |
| Characiformes | Characidae | Odontostilbe dierythrura | native | ||
| Characiformes | Characidae | Odontostilbe fugitiva | native | ||
| Characiformes | Characidae | Odontostilbe microcephala | native | ||
| Characiformes | Characidae | Odontostilbe nareuda | native | ||
| Characiformes | Characidae | Oligosarcus bolivianus | native | ||
| Characiformes | Characidae | Oligosarcus schindleri | native | ||
| Salmoniformes | Salmonidae | Oncorhynchus mykiss | introduced | Rainbow trout | |
| Cichliformes | Cichlidae | Oreochromis mossambicus | introduced | Mozambique tilapia | |
| Cichliformes | Cichlidae | Oreochromis niloticus | introduced | Nile tilapia | |
| Cyprinodontiformes | Cyprinodontidae | Orestias agassizii | native | ||
| Cyprinodontiformes | Cyprinodontidae | Orestias albus | native | ||
| Cyprinodontiformes | Cyprinodontidae | Orestias cuvieri | native | Orestias | |
| Cyprinodontiformes | Cyprinodontidae | Orestias forgeti | native | ||
| Cyprinodontiformes | Cyprinodontidae | Orestias frontosus | native | Carache | |
| Cyprinodontiformes | Cyprinodontidae | Orestias gilsoni | endemic | Carache | |
| Cyprinodontiformes | Cyprinodontidae | Orestias gracilis | native | ||
| Cyprinodontiformes | Cyprinodontidae | Orestias imarpe | native | ||
| Cyprinodontiformes | Cyprinodontidae | Orestias incae | native | ||
| Cyprinodontiformes | Cyprinodontidae | Orestias ispi | native | ||
| Cyprinodontiformes | Cyprinodontidae | Orestias luteus | native | ||
| Cyprinodontiformes | Cyprinodontidae | Orestias minimus | native | ||
| Cyprinodontiformes | Cyprinodontidae | Orestias olivaceus | native | ||
| Cyprinodontiformes | Cyprinodontidae | Orestias tchernavini | native | ||
| Cyprinodontiformes | Cyprinodontidae | Orestias tomcooni | native | ||
| Cyprinodontiformes | Cyprinodontidae | Orestias tschudii | native | ||
| Cyprinodontiformes | Cyprinodontidae | Orestias tutini | native | ||
| Siluriformes | Doradidae | Ossancora asterophysa | native | ||
| Siluriformes | Doradidae | Ossancora eigenmanni | native | ||
| Siluriformes | Doradidae | Ossancora fimbriata | native | ||
| Siluriformes | Doradidae | Ossancora punctata | native | ||
| Siluriformes | Loricariidae | Otocinclus mariae | native | ||
| Siluriformes | Loricariidae | Otocinclus vestitus | native | ||
| Siluriformes | Loricariidae | Otocinclus vittatus | native | ||
| Siluriformes | Doradidae | Oxydoras kneri | native | ||
| Siluriformes | Doradidae | Oxydoras niger | native | Ripsaw catfish | |
| Eupercaria/misc | Sciaenidae | Pachyurus schomburgkii | native | Amazon croaker | |
| Cyprinodontiformes | Poeciliidae | Pamphorichthys hasemani | native | Haseman's toothcarp | |
| Cyprinodontiformes | Rivulidae | Papiliolebias ashleyae | native | ||
| Cyprinodontiformes | Rivulidae | Papiliolebias bitteri | native | ||
| Cyprinodontiformes | Rivulidae | Papiliolebias francescae | native | ||
| Myliobatiformes | Potamotrygonidae | Paratrygon aiereba | native | Discus ray | Raya |
| Characiformes | Characidae | Parecbasis cyclolepis | native | ||
| Characiformes | Parodontidae | Parodon buckleyi | native | ||
| Characiformes | Parodontidae | Parodon carrikeri | native | ||
| Siluriformes | Loricariidae | Peckoltia vittata | native | ||
| Clupeiformes | Pristigasteridae | Pellona castelnaeana | native | Amazon pellona | |
| Characiformes | Characidae | Phenacogaster beni | native | ||
| Siluriformes | Heptapteridae | Phenacorhamdia boliviana | endemic | Bagre | |
| Siluriformes | Pimelodidae | Phractocephalus hemioliopterus | native | Redtail catfish | |
| Siluriformes | Phreatobiidae | Phreatobius sanguijuela | native | ||
| Characiformes | Iguanodectidae | Piabucus caudomaculatus | native | ||
| Characiformes | Iguanodectidae | Piabucus melanostoma | native | ||
| Characiformes | Serrasalmidae | Piaractus brachypomus | native | Pirapitinga | Tambaqui |
| Characiformes | Serrasalmidae | Piaractus mesopotamicus | native | Pacu | |
| Siluriformes | Heptapteridae | Pimelodella boliviana | endemic | ||
| Siluriformes | Heptapteridae | Pimelodella chaparae | endemic | Bagre | |
| Siluriformes | Heptapteridae | Pimelodella howesi | native | Bagre | |
| Siluriformes | Heptapteridae | Pimelodella nigrofasciata | endemic | Bagre | |
| Siluriformes | Heptapteridae | Pimelodella roccae | native | ||
| Siluriformes | Heptapteridae | Pimelodella serrata | native | Bagre | |
| Siluriformes | Pimelodidae | Pimelodus blochii | native | Bloch's catfish | |
| Siluriformes | Pimelodidae | Pinirampus pirinampu | native | Flatwhiskered catfish | |
| Eupercaria/misc | Sciaenidae | Plagioscion squamosissimus | native | South American silver croaker | |
| Siluriformes | Loricariidae | Planiloricaria cryptodon | native | ||
| Siluriformes | Doradidae | Platydoras armatulus | native | Southern striped raphael | |
| Siluriformes | Doradidae | Platydoras costatus | native | Raphael catfish | |
| Siluriformes | Doradidae | Platydoras hancockii | native | Blue-eye catfish | |
| Siluriformes | Pimelodidae | Platysilurus mucosus | native | ||
| Siluriformes | Trichomycteridae | Plectrochilus machadoi | native | ||
| Characiformes | Characidae | Poptella compressa | native | ||
| Siluriformes | Trichomycteridae | Potamoglanis hasemani | native | ||
| Characiformes | Curimatidae | Potamorhina altamazonica | native | ||
| Characiformes | Curimatidae | Potamorhina latior | native | ||
| Beloniformes | Belonidae | Potamorrhaphis eigenmanni | native | ||
| Myliobatiformes | Potamotrygonidae | Potamotrygon falkneri | native | Largespot river stingray | Raya de agua dulce |
| Myliobatiformes | Potamotrygonidae | Potamotrygon motoro | native | South American freshwater stingray | |
| Myliobatiformes | Potamotrygonidae | Potamotrygon orbignyi | native | Smooth back river stingray | |
| Characiformes | Characidae | Prionobrama filigera | native | Glass bloodfin | |
| Characiformes | Characidae | Prionobrama paraguayensis | native | ||
| Characiformes | Prochilodontidae | Prochilodus nigricans | native | Black prochilodus | |
| Characiformes | Characidae | Prodontocharax howesi | native | ||
| Characiformes | Characidae | Prodontocharax melanotus | native | ||
| Characiformes | Characidae | Protocheirodon pi | native | ||
| Characiformes | Curimatidae | Psectrogaster curviventris | native | Sabalina | |
| Characiformes | Curimatidae | Psectrogaster essequibensis | native | ||
| Characiformes | Curimatidae | Psectrogaster rutiloides | native | ||
| Siluriformes | Aspredinidae | Pseudobunocephalus amazonicus | native | ||
| Siluriformes | Aspredinidae | Pseudobunocephalus bifidus | native | ||
| Siluriformes | Loricariidae | Pseudohemiodon thorectes | native | ||
| Siluriformes | Pseudopimelodidae | Pseudopimelodus mangurus | native | ||
| Siluriformes | Pimelodidae | Pseudoplatystoma fasciatum | native | Barred sorubim | |
| Siluriformes | Pimelodidae | Pseudoplatystoma reticulatum | native | ||
| Siluriformes | Pimelodidae | Pseudoplatystoma tigrinum | native | Tiger sorubim | |
| Beloniformes | Belonidae | Pseudotylosurus angusticeps | native | ||
| Siluriformes | Aspredinidae | Pterobunocephalus depressus | native | ||
| Siluriformes | Doradidae | Pterodoras granulosus | native | Granulated catfish | |
| Cyprinodontiformes | Rivulidae | Pterolebias longipinnis | native | Longfin killie | |
| Cyprinodontiformes | Rivulidae | Pterolebias phasianus | native | ||
| Siluriformes | Loricariidae | Pterygoplichthys ambrosettii | native | ||
| Siluriformes | Loricariidae | Pterygoplichthys disjunctivus | native | Vermiculated sailfin catfish | |
| Siluriformes | Loricariidae | Pterygoplichthys lituratus | native | ||
| Siluriformes | Loricariidae | Pterygoplichthys punctatus | native | Corroncho | |
| Characiformes | Serrasalmidae | Pygocentrus nattereri | native | Red piranha | Palometa |
| Characiformes | Lebiasinidae | Pyrrhulina australis | native | ||
| Characiformes | Lebiasinidae | Pyrrhulina beni | native | ||
| Characiformes | Lebiasinidae | Pyrrhulina vittata | native | Banded pyrrhulina | |
| Gymnotiformes | Sternopygidae | Rhabdolichops caviceps | native | ||
| Gymnotiformes | Sternopygidae | Rhabdolichops eastwardi | native | ||
| Siluriformes | Loricariidae | Rhadinoloricaria bahuaja | native | ||
| Siluriformes | Heptapteridae | Rhamdella rusbyi | endemic | ||
| Siluriformes | Heptapteridae | Rhamdia poeyi | native | ||
| Siluriformes | Heptapteridae | Rhamdia quelen | native | South American catfish | |
| Siluriformes | Doradidae | Rhinodoras dorbignyi | native | ||
| Siluriformes | Pseudopimelodidae | Rhyacoglanis epiblepsis | native | ||
| Characiformes | Anostomidae | Rhytiodus lauzannei | native | ||
| Siluriformes | Loricariidae | Rineloricaria beni | native | ||
| Characiformes | Characidae | Roeboides dispar | native | ||
| Characiformes | Bryconidae | Salminus brasiliensis | native | Dorado | |
| Salmoniformes | Salmonidae | Salmo trutta | introduced | Sea trout | |
| Salmoniformes | Salmonidae | Salvelinus fontinalis | introduced | Brook trout | |
| Cichliformes | Cichlidae | Satanoperca jurupari | native | Demon eartheater | |
| Cichliformes | Cichlidae | Satanoperca pappaterra | native | Pantanal eartheater | |
| Characiformes | Anostomidae | Schizodon fasciatus | native | ||
| Characiformes | Anostomidae | Schizodon isognathus | native | ||
| Siluriformes | Scoloplacidae | Scoloplax dicra | native | ||
| Siluriformes | Scoloplacidae | Scoloplax empousa | native | Pantanal dwarf catfish | |
| Characiformes | Characidae | Serrapinnus micropterus | native | ||
| Characiformes | Serrasalmidae | Serrasalmus compressus | native | Piraña | |
| Characiformes | Serrasalmidae | Serrasalmus elongatus | native | Slender piranha | Piraña |
| Characiformes | Serrasalmidae | Serrasalmus hollandi | native | Piraña | |
| Characiformes | Serrasalmidae | Serrasalmus humeralis | native | Pirambeba | |
| Characiformes | Serrasalmidae | Serrasalmus maculatus | native | ||
| Characiformes | Serrasalmidae | Serrasalmus odyssei | native | ||
| Characiformes | Serrasalmidae | Serrasalmus rhombeus | native | Redeye piranha | |
| Siluriformes | Pimelodidae | Sorubim elongatus | native | Slender shovelnose catfish | |
| Siluriformes | Pimelodidae | Sorubim lima | native | Duckbill catfish | |
| Siluriformes | Pimelodidae | Sorubim maniradii | native | ||
| Siluriformes | Pimelodidae | Sorubimichthys planiceps | native | Firewood catfish | |
| Siluriformes | Loricariidae | Spatuloricaria evansii | native | ||
| Cyprinodontiformes | Rivulidae | Spectrolebias brousseaui | native | ||
| Cyprinodontiformes | Rivulidae | Spectrolebias filamentosus | endemic | ||
| Cyprinodontiformes | Rivulidae | Spectrolebias pilleti | native | ||
| Gymnotiformes | Hypopomidae | Steatogenys elegans | native | Barred knifefish | |
| Characiformes | Curimatidae | Steindachnerina bimaculata | native | ||
| Characiformes | Curimatidae | Steindachnerina binotata | native | ||
| Characiformes | Curimatidae | Steindachnerina dobula | native | ||
| Characiformes | Curimatidae | Steindachnerina guentheri | native | ||
| Characiformes | Curimatidae | Steindachnerina hypostoma | native | ||
| Characiformes | Curimatidae | Steindachnerina leucisca | native | ||
| Characiformes | Curimatidae | Steindachnerina planiventris | native | ||
| Siluriformes | Trichomycteridae | Stenolicmus sarmientoi | native | ||
| Gymnotiformes | Sternopygidae | Sternopygus macrurus | native | Longtail knifefish | |
| Characiformes | Characidae | Stethaprion crenatum | native | ||
| Synbranchiformes | Synbranchidae | Synbranchus madeirae | native | ||
| Synbranchiformes | Synbranchidae | Synbranchus marmoratus | native | Marbled swamp eel | |
| Siluriformes | Auchenipteridae | Tatia aulopygia | native | ||
| Characiformes | Gasteropelecidae | Thoracocharax stellatus | native | Spotfin hatchetfish | |
| Siluriformes | Doradidae | Trachydoras microstomus | native | ||
| Siluriformes | Doradidae | Trachydoras paraguayensis | native | ||
| Siluriformes | Doradidae | Trachydoras steindachneri | native | ||
| Siluriformes | Trichomycteridae | Trichomycterus aguarague | native | ||
| Siluriformes | Trichomycteridae | Trichomycterus atochae | native | ||
| Siluriformes | Trichomycteridae | Trichomycterus barbouri | native | ||
| Siluriformes | Trichomycteridae | Trichomycterus borellii | native | ||
| Siluriformes | Trichomycteridae | Trichomycterus chaberti | endemic | ||
| Siluriformes | Trichomycteridae | Trichomycterus duellmani | native | ||
| Siluriformes | Trichomycteridae | Trichomycterus fassli | native | ||
| Siluriformes | Trichomycteridae | Trichomycterus rivulatus | native | ||
| Siluriformes | Trichomycteridae | Trichomycterus therma | native | ||
| Siluriformes | Trichomycteridae | Trichomycterus tiraquae | native | ||
| Siluriformes | Trichomycteridae | Tridentopsis pearsoni | native | ||
| Cyprinodontiformes | Rivulidae | Trigonectes rogoaguae | endemic | ||
| Characiformes | Triportheidae | Triportheus albus | native | ||
| Characiformes | Triportheidae | Triportheus angulatus | native | ||
| Siluriformes | Auchenipteridae | Tympanopleura atronasus | native | ||
| Siluriformes | Auchenipteridae | Tympanopleura brevis | native | ||
| Siluriformes | Auchenipteridae | Tympanopleura rondoni | native | ||
| Characiformes | Characidae | Tyttobrycon dorsimaculatus | native | ||
| Characiformes | Characidae | Tyttobrycon spinosus | native | ||
| Siluriformes | Trichomycteridae | Vandellia cirrhosa | native | Candiru | |
| Characiformes | Characidae | Xenurobrycon polyancistrus | native | ||
| Siluriformes | Pimelodidae | Zungaro jahu | native | ||
| Siluriformes | Pimelodidae | Zungaro zungaro | native | Gilded catfish |