Wow!
That is a lot. 50 at a time is enough for me. The first time i saw guppy fry out of one of my fishes, she only had 11, but then the next day my other female had about 50, and she did it again 4 months in a row. After the second time i stopped trying to count and didn't even do much to prevent them being eaten, because i only had 1 10 gallon tank set up. Now i have the boys in a 30 g an the girls in 2 different 10 gs but i think they're still over crowded. I haven't had a brood of more than 3 at a time in over a year.