noun,plural(especially collectively)stud·fish,(especially referring to two or more kinds or species)stud·fish·es.
either of two killifishes marked with orange spots, Fundulus catenatus(northern studfish), of the Tennessee and Cumberland rivers and Ozark Mountains region, or F. stellifer(southern studfish), of the Alabama River.
Origin of studfish
An Americanism dating back to 1880–85;stud1 + fish
