Blimey!!! A fair few mouths to feed there.
Common motoro's do have very large litters from time to time, this could well be a factor when using this species in breeding programs to produce more pups.
The word "common" is probably a little harsh and the wrong way to phrase it, this is a wide spread and variable species , many representatives being amongst the most beautiful Stingrays to come out of South America.....I think this girl is a very good example of that !
Big congratulations......you did a great job!