IDK if I could say this is a pure shortnose. I have them wild here and catch them regularly and none of the ones I catch have spotting on the sides of their bodies, strictly only the tail gets spots. Also if it was 13 years old it should be max size by now unless it was growth stunted. I've personally caught shortnose out here pushing 3ft. To me this gar looks like it's a possible hybrid between the Florida gar and the shortnose.