Little fun fact, this species is now know as Parachromis Multifasciatus (it was formally P. Friedrichsthalii) P. Friedrichsthalii is now the scientific name for the formally described P. Loisellei
It is a little hard to tell, because one of the most important features in gender ID of any Parachromis are the markings on the lower gill plate, and lower jaw. I edited your pica little, but that otten removes detail, sp hard to see if there are subtle striations..
If the lower gill plate and jaw has striations, it is usually a male, if the jaw is a solid color female.
Here is an example using P motaguense.
male, in this case small spots
below female, no small spots
If you could get a close up of the face with clear detail it would help.