Stud'fish` noun (Zoology) Any one of several species of small American minnows of the genus Fundulus , as F. catenatus . Found on http://www.encyclo.co.uk/webster/S/215
either of two killifishes marked with orange spots, Fundulus catenatusof the Tennessee and Cumberland rivers and Ozark Mountains region, or F. stelliferof the Alabama River. Found on https://www.infoplease.com/dictionary/studfish