Can Fry Breed With Their Parents?

it depends on the type of fish.

with annual killifish for example, no, because the parents will have died
But with livebearers like guppies, mollies etc.. yes, because the fry become fertile at about 6 weeks and they try to mate with anything.

T_J
 
Once mature yes.

Guppies and mollies mature at around 6-16 weeks
Swords and platies mature from 6 week till 10 months.
 

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