Glass cats sexing possible? by eye and organ colors

[acidise]

Hi there, I haven't found a place that says how to sex glass cats yet but i was wondering if the eys and organs coloring could be used to do it. I have 4 in a tank with some other fish.
I have 2 with black iris' and black pupils so the eyes look more or less on solid black dot with a faint faint pupil outline. They also have very dark internal organs. black/dark gray.
the other two have silver iris' and black pupils so the eyes are easily defined. and their organs, are silver/ very shiny.
Just a thought as to sexing them.
have a good day everyone.

[Silurus]

I'm not aware that you can sex silurids this way. The most reliable method, IME, is to examine the pectoral spines. Males (especially mature males) typically have well-developed serrations on the posterior edge of the spine, which is weakly-serrated or smooth in females.

[acidise]

Thankyou silurus, well that means i presumably have all female glass cats. cuz the entire pectoral fin looks to be a perfectly smooth arc all the way around, no serrations anywhere. I like this method, that is pretty darn easy, as long as i can get them with the right background to see the fins. thanks pal.