So, first the observation. 180 fry in my first batch made it to 2.5 months. 1 let me repeat this, ONE turned out to be male.
To research I go. Turns out, they still don't exactly know what causes a fishes sex. Even going down to the DNA level. At least this was what I understood from the papers.
I might try and figure this out as I would rather not have to cup 1300 Bettas. Im going to switch one aspect of ever breeding to see if I can isolate and repeat the process. If I can, then I'll have it tested and see if we can't figure it out.
I've never heard of such a ratio before. 1 male to every 180 females is insane and exactly what I could have wished for.