oar fish [UK and USA] – synonym of Regalecus glesne
oarfish [UK and USA] – synonym of Lophotus lacepedei
oblade [France and Belgium] – synonym of Oblada melanura
oblade [France and Belgium] – synonym of Oblada melanura
obrvan [former Yugoslavia] – synonym of Aphanius fasciatus
obtuse barracuda [UK and USA] – synonym of Sphyraena chrysotaenia
ocean sunfish [UK and USA] – synonym of Mola mola
Oceanic whitetip shark [UK and USA] – synonym of Carcharhinus longimanus
Oceano Belgium alluente'). – synonym of Glyptocephalus cynoglossus
odontaspide féroce [France and Belgium] – synonym of Odontaspis ferox
of Britain). No type material. – synonym of Raja radiata
often confused with B. luteum Risso, 1810 – synonym of Microchirus boscanion
often misidentified as Epinephelus tauvina (Forsskål, 1775) which is a different species – synonym of Epinephelus malabaricus
oilfish [UK and USA] – synonym of Ruvettus pretiosus
ombervis [Netherlands and Belgium] – synonym of Argyrosomus regius
omble chevalier [France and Belgium] – synonym of Salvelinus alpinus
ombrine bronze [France and Belgium] – synonym of Umbrina canariensis
ombrine commune [France and Belgium] – synonym of Umbrina cirrosa
ombrine côtière [France and Belgium] – synonym of Umbrina cirrosa
ombrine fusca [France and Belgium] – synonym of Umbrina ronchus
ombrine [France and Belgium] – synonym of Umbrina cirrosa
ombrine [Tunesia, Algeria, Morocco] – synonym of Argyrosomus regius
opah [UK and USA] – synonym of Lampris guttatus
orfan [former Yugoslavia] – synonym of Seriola dumerili
ornate wrasse [UK and USA] – synonym of Thalassoma pavo
orphie carene [France and Belgium] – synonym of Platybelone argalus
orphie [France and Belgium] – synonym of Belone belone
ors [No, Sv] – synonym of Osmerus eperlanus
oslic [former Yugoslavia] – synonym of Merluccius merluccius
otolithe nanka [France and Belgium] – synonym of Pseudotolithus typus
otolithe sénégalais [France and Belgium] – synonym of Pseudotolithus senegalensis
Otoliths (sagitta). Smith, 1950: 501, fig. U 2. – synonym of Epinephelus malabaricus
ouarka [Tunesia, Algeria, Morocco] – synonym of Diplodus sargus
oultan [Ar – synonym of Symphodus ocellatus
ourhaghis [Tunesia, Algeria, Morocco] – synonym of Liza saliens
ovcica [former Yugoslavia] – synonym of Lithognathus mormyrus
ovrata [former Yugoslavia] – synonym of Sparus aurata
Ox-eye scad [UK and USA] – synonym of Selar boops
oxyrhine [France and Belgium] – synonym of Isurus oxyrinchus