01-06-2010, 12:10 PM
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Just sharing my experience with platys:
I bought some mickey mouse platies and less than a week after I brought them home, one of the females gave birth. It is obvious that she got pregnant at the pet store, and she came from ang all-mickey display tank. Observing the fry, I noticed that some of the fry did not show all the characteristics of the parents. The parents had yellow body, mickey mouse spot, and red spot on back. Some were only yellow, some had the red spot, while some were drab grey with a faint mickey mouse spot. Very few looked exactly like their parents.
I also have an acquaintance who is a show guppy breeder. He says that livebearers, no matter how good the genetics of the parents, tend to have low-quality offspring. Even with good lines, he deems only around 5% of the fry of acceptable quality, sometimes even less. The rest are thrown away or become feeders for predatory fish.