jaglun [former Yugoslavia] – synonym of Xiphias gladius
jaram mlat [former Yugoslavia] – synonym of Sphyrna zygaena
jarel [Tunesia, Algeria, Morocco] – synonym of Spicara smaris
jarretière [France and Belgium] – synonym of Cepola rubescens
javra [former Yugoslavia] – synonym of Liza aurata
jeffrey's goby [UK and USA] – synonym of Buenia jeffreysii
jegulja [former Yugoslavia] – synonym of Anguilla anguilla
jelly wolf-fish [UK and USA] – synonym of Anarhichas denticulatus
jellynose [UK and USA] – synonym of Guentherus altivela
jellynose [UK and USA] – synonym of Ijimaia loppei
jesetra tuponoska [former Yugoslavia] – synonym of Acipenser naccarii
jesetra [former Yugoslavia] – synonym of Acipenser sturio
joël [France and Belgium] – synonym of Atherina boyeri
john dory [UK and USA] – synonym of Zeus faber
Johnson's Blackdevil – synonym of Melanocetus johnsoni
Jordan's Fanfin [UK and USA] – synonym of Caulophryne jordani