Larvae and juveniles of Fundulus heteroclitus (Mummichog), commonly occur in small, water-filled depressions on the intertidal marsh surface during low tide. Previous work has shown that larger juveniles are typically found at lower elevations on the marsh surface, while small larvae are more abundant in the high marsh. The present study compared the abundance and size distributions of larval and juvenile Mummichog between relatively low- and high-elevation sites on the marsh surface at three locations in Northeastern Florida. Fundulus heteroclitus were both more abundant and larger in size at low-elevation sites than at high-elevation sites following the size-selective marsh-use pattern shown in other locations.