Obese Synodontis - Synodontis obesus
Obliquidens Hap - Haplochromis obliquidens
Obscure Snakehead - Parachanna obscura
Ocellated Freshwater Stingray - Potamotrygon motoro
Ocellated Laprologus - Lamprologus ocellatus
Ocellated Loach - Acanthocobitis urophthalmus
Ocellated Shell-Dweller - Neolamprologus kungweensis
Ocellated Synodontis - Synodontis ocellifer
Odynea Pimelodid Catfish - Pimelodella chagresi odynea
One-Gilled Swamp Eel - Ophisternon bengalense
One-Lined Pencilfish - Nannobrycon unifasciatus
One-Spot Synodontis - Synodontis notatus
Opaline Gourami - Trichogaster trichopterus
Orange Chromide - Etroplus maculatus
Orange-Finned Loach - Botia modesta
Orange-Lined Cichlid - Melanochromis joanjohnsonae
Oriental Snakehead - Channa orientalis
Ornate Bichir - Polypterus ornatipinnis
Ornate Ctenopoma - Ctenopoma ansorgii
Ornate Fin Nipper - Ichthyborus ornatus
Ornate Pimelodus - Pimelodus ornatus
Oscar - Astronotus ocellatus
Otocinclus - Otocinclus affinis
Oxeye Herring - Megalops cyprinoldes
Ozola Barb - Barilius barna

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