Piranha egg questions

If you dont know the answer to this question feel free to give your opinion

I was wondering if different piranha species carry their eggs in slightly different locations and whether certain species produce more eggs than others.

The reason I wonder is that my female Nattereri I used to have would have a huge bulge when she had eggs and it was low and between her pectoral fins and the start to her anal fin

my cariba only show small bulges from time to time and the bulge is slightly higher and further forward, like just behing the pectoral fins

this could be nothing, just had me wondering