I'll lend a start for more experienced breeders to edit and build on:
To induce breeding, there isn't much you can do, except keeping water quality good and distractions such as people walking around in the room, making the rays think there is food on the way, to a minimum.
As for the pups, the general consensus is that you sell them whenever you want as long as a couple key factors are met:
1.)The rays are acclimated and stable. They recommend to wait about 4-6 weeks until selling. You can't ship a 3 day old ray as soon as you see it feed once!
2.)The rays are feeding well on food that will be readily available to their new owners such as chopped night crawlers or chopped prawns.
3.) (This is optional.) You wait to see how the patterns develop to see of you have any pattern morphs you think or are told that you can sell for more or should sell for less. Pattern normally reaches this stage around 3-5 months.
Hope I could help!
All this info courtesy of the stingray forum contributors on MFK!
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