The basics are;
oo = male
oO = female
Some species males have a triangulated pecker hole
oo = male
oO = female
Some species males have a triangulated pecker hole
I attached 9 severum pictures of whole picture of fish and venting picture of fish. I added numbers in pictures. Please check and identify severum fishes.Venting rules for severums are going to be just about the same for any cichlid.
Both holes are the same size on makes, while one is larger in females.
Severums do show sexual dimorphism though, and generally you can tell without venting.
Pictures of the fish and their vents will help.
Thanks for your response guysThey’re all non binary
Seriously though some of them are a tough call for sure. My thoughts with percentage of certainty
9 F 100%
8 M 100%
7 F 75%
6 M 75%
5 M 90%
4 M 100%
3 F 75%
2 M 100%
1 F 75%