Panaque (Eigenmann & Eigenmann, 1889)
Paracyprichromis (Boulenger, 1901)
Parahemiodon (Bleeker, 1862) -> Loricariichthys (Bleeker, 1862)
Paralithoxus (Boeseman 1982) -> Lithoxus (Eigenmann 1910)
Paraloricaria (Isbrücker, 1979)
Parancistrus (Bleeker, 1862)
Parasturisoma (Miranda Ribeiro 1939) -> Sturisoma (Swainson 1838)
Paratilapia (Bleeker 1868)
Pareiorhaphis (Miranda Ribeiro 1918) -> Hemipsilichtys (Eigenmann & Eigenmann 1889)
Pareiorhina (Gosline 1947)
Parotocinclus (Eigenmann & Eigenmann 1889)
Peacock Cichlid -> Astronotus ocellatus (Agassiz 1831)
Peckoltia (Miranda Ribeiro 1912)
Peckoltichthys (Miranda Ribeiro 1917) -> Peckoltia (Miranda Ribeiro 1912)
Pelmatochromis (Steindachner 1894)
Pelvicachromis (Thys van den Audenaerde 1968)
Perca Bimaculata -> Cichlasoma bimaculatum
Petenia (Günther, 1862)
Petrotilapia (Trewavas, 1935)
Pfauenaugenbuntbarsch -> Astronotus ocellatus (Agassiz, 1831)
Pin-Striped Pleco -> Panaque nigrolineatus (Peters, 1877)
Placidochromis (Eccles & Trewavas, 1989)
Planiloricaria (Isbrücker, 1971)
Plecostomus (Gronovius, 1839) (Gronovius, 1854) (Bleeker, 1862)
Pogonopoma (Regan, 1904)
Pogonopomoides (Gosline, 1947)
Prinzessin von Zambia -> Neolamprologus sp. "daffodil"
Prinzessin von Burundi -> Neolamprologus brichardi
Pristiancistrus (Fowler, 1945) -> Ancistrus (Kner, 1854)
Proloricaria (Isbrücker, 2001)
Protomelas (Günther, 1894)
Pseudoacanthicus (Bleeker, 1862)
Pseudoancistrus (Bleeker, 1862)
Pseudocanthicus (Steindachner, 1915) -> Pseudoacanthicus (Bleeker, 1862)
Pseudocrenilabrus (Fowler, 1934)
Pseudohemiodon (Bleeker, 1862)
Pseudolithoxus (Isbrücker & Werner, 2001)
Pseudoloricaria (Bleeker, 1862)
Pseudorinelepis (Bleeker, 1862)
Pseudotropheus (Regan, 1922)
Pterophyllum
Pterophyllum altum
Pterygoplichthys (Gill, 1858)
Pundamilia
Pundamilia Nyererei -> Haplochromis nyererei
Pyxiloricaria (Isbrücker & Nijssen, 1984)