If you want to know (round about) when your livebearers will drop next, then keep an eye on the gravid spot, (the dark spot near the vent) as this is a good indication of when they will drop... IE:... the darker it gets, the closer she is to dropping.
The prolific little Guppy...
It's known by several different names around the world, and one of these is the "Millions Fish".. which is pretty much right.
Some number cruncher.. many years ago... worked out that if a breeding pair were to produce a brood, and none were lost or eaten, and "they" went on to breed.. again, with no losses... and this continued for a year... with each additional brood breeding plus the rest.... with no losses... then the result would be over 3,000,000 offspring.... Pretty astounding for a little fish.
It is also known for these fish to change sex if there isn't a mate of the oposite sex available.
Regards,
Bill.