Does anyone know how to tell the difference between Periophthalmus barbarus mudskipper genders?

Question

Their common names are African mudskippers.

Answer 1

This one took some research - I finally found an answer in the online Journal of the International Goby Society. Generally, the dorsal fin is higher in males and the genital papilla is broader and the free end rounded in females. Guess you'd need several for comparison to be sure.

Info & article is on the last page (10): http://gobiidae.com/jigs2/JIGS_vol2_4.pdf