ugor [former Yugoslavia] – synonym of Conger conger
ugotica pucinca [former Yugoslavia] – synonym of Micromesistius poutassou
ugotica srebrenka [former Yugoslavia] – synonym of Gadiculus argenteus
Undistinguished sabretooth [UK and USA] – synonym of Odontostomops normalops
Undulate ray [UK and USA] – synonym of Raja undulata
unicorn fish [UK and USA] – synonym of Lophotus lacepedei
usata [former Yugoslavia] – synonym of Oblada melanura