- goby, gudgeon - small spiny-finned fish of coastal or brackish waters having a large head and elongated tapering body having the ventral fins modified as a sucker
--1 is a kind of percoid fish, percoid, percoidean
--1 is a member of Gobiidae, family Gobiidae
--1 has particulars: mudskipper, mudspringer - gudgeon, Gobio gobio - small slender European freshwater fish often used as bait by anglers
--2 is a kind of cyprinid, cyprinid fish
--2 is a member of Gobio, genus Gobio