zalm [Netherlands and Belgium] – synonym of Salmo salar
Zambriborsch, 1968: 42. – synonym of Zosterisessor ophiocephalus
zandrog [Netherlands and Belgium] – synonym of Raja circularis
zandspiering [Netherlands and Belgium] – synonym of Ammodytes tobianus
zandtong [Netherlands and Belgium] – synonym of Solea lascaris
zebra goby [UK and USA] – synonym of Zebrus zebrus
zebra sea bream [UK and USA] – synonym of Diplodus cervinus
zeebaars [Netherlands and Belgium] – synonym of Dicentrarchus labrax
zeebaars [Netherlands and Belgium] – synonym of Dicentrarchus punctatus
zeebarbeel [Netherlands and Belgium] – synonym of Mullus surmuletus
zeebrasem[Netherlands and Belgium] – synonym of Pagellus bogaraveo
zeedonderpad [Netherlands and Belgium] – synonym of Myoxocephalus scorpius
zeeduivel [Netherlands and Belgium] – synonym of Lophius piscatorius
zeeëngel [Netherlands and Belgium] – synonym of Squatina squatina
zeeforel [Netherlands and Belgium] – synonym of Salmo trutta
zeekarper [Netherlands and Belgium] – synonym of Spondyliosoma cantharus
zeepaardje [Netherlands and Belgium] – synonym of Hippocampus ramulosus
zeepaling [Netherlands and Belgium] – synonym of Conger conger
zeeprik [Netherlands and Belgium] – synonym of Petromyzon marinus
zeepuitaal [Netherlands and Belgium] – synonym of Ciliata mustela
zeestekelbaars [Netherlands and Belgium] – synonym of Spinachia spinachia
zeewolf [Netherlands and Belgium] – synonym of Anarhichas lupus
zérica [Tunesia, Algeria, Morocco] – synonym of Prionace glauca
zmijicnjak repas [former Yugoslavia] – synonym of Lepidopus caudatus
zmijicnjak sabljas [former Yugoslavia] – synonym of Trichiurus lepturus
zob al sultan [Tunesia, Algeria, Morocco] – synonym of Symphodus tinca
zonnevis [Netherlands and Belgium] – synonym of Zeus faber
zubatac [former Yugoslavia] – synonym of Dentex dentex
zugmayer's pearleye [UK and USA] – synonym of Benthalbella infans
zultan [Tunesia, Algeria, Morocco] – synonym of Symphodus mediterraneus
zupka [former Yugoslavia] – synonym of Prionace glauca
zwaardvis [Netherlands and Belgium] – synonym of Xiphias gladius
zwartbekhondshaai [Netherlands and Belgium] – synonym of Galeus melastomus
zwarte doornhaai [Netherlands and Belgium] – synonym of Etmopterus spinax
zwarte grondel [Netherlands and Belgium] – synonym of Gobius niger
zwarte haai [Netherlands and Belgium] – synonym of Dalatias licha
zwarte heilbot [Netherlands and Belgium] – synonym of Reinhardtius hippoglossoides
zwarte vis [Netherlands and Belgium] – synonym of Centrolophus niger
zwartooglipvis [Netherlands and Belgium] – synonym of Symphodus melops