The dealer of p's at cartimar told me they had "black" piranhas for sale a few years ago. when i asked the body shape he described it as a rhom would look like..he says they are being bred in fish ponds at laguna along with rbp's however typhoon milenyo destroyed most of the cages (uh-oh..there goes the aquaculture industry around laguna lake) so they currently don't have any stock. The price is 800 pesos for a one inch "black" piranha. He takes advance orders though, and if the order count goes to a hundred then he orders from his breeder. Check it out if you have the time guys.