It was all speculation to begin with. lmao. The whole 50 50 debate was so far off so far as breeding guppies in the general aquarium lmao. Anyways, no matter what proof folks think they can provide with regards to it being 'unusual' that the female ratio was higher in not only mine but other peoples tanks kinda disproved the 50 50 point. So I think im done now with the discussion lol.
First, a few tanks doesn't "prove" much of anything, the sample size is still way way WAY too small. Nowhere near large enough to draw a conclusion about the genetic tendencies of guppies as a species.
What's more, you can't sex them at birth; What is the survival rate? The survival rates of each sex differs depending on environmental changes(which I posted a reference to earlier in this thread). The authors of that paper noted that they were able to observe ratios that differed from 50/50, though not significant. They concluded that this was likely to do with the survival rates of each sex.
As I've said, this isn't the kind of thing you can determine in a home aquarium. Does anyone have anything that's been put together by a lab and published, aside from what I posted? It says, though this isn't the focus of the paper, that 50/50 is the norm. Survival rates might not match that, and because it's random you're never guaranteed that ratio.
Want to try out a random walk for yourself? Grab your jar of pennies, take out 40 of them, and scatter them on the floor from high-above so they flip around. Do you have
exactly 20 heads and 20 tails? I doubt it.