Probably Serrasalmus... oops just found it they renames them.... PYGOCENTRUS nattereri, Red Bellied Piranha, but do not look like it.
Coulc be Pygocentrus or Serassalmus rhombeus or another species or just badly coloured nattereri, which older fish do look like, but piraya and notatus can both be easily ruled out.
I am annoyed with myself I did not study them more closely as I normally do when I see larger specimens of Piranha!
Easy to keep ... as long as you do not let them go hungry and doing that too many times with a group will result in just one very large specimen roaming around the aquarium.
Properly pronounced peer-on-ya which I heard someone call these particular specimens to my shock.
You do not have to feed them fish either! Earthworms are eaten just as readily as would prawns or anything else meaty in texture. Fried chicken does tend to foul the water up so be warned or you wake up one morning to find your over stocked with milk by a few dozen gallon with Piranha floating around dead in it.
They do come from the Amazon in South America so anyone wanting to breed them, it is not beyond the realms of possibility, I would go for soft water as you would use for breeding Angels and Discus but you had better be fanatical about these fish as the other things required is a big spacious tank.
This is because while breeding the mating pair will swim very quickly alongside each other and the head upwards and over before back on themselves, kind of like a look the loop of an aircraft. This is normally done with either floating vegetation or vegetation close to the surface. What with the sizes of adult Piranha and this mating loop the loop fashion is why you would need a spacious tank. If in your living room and water resistant carpet might not be a bad idea or a close fitting lid, unless your aquarium s a couple metres long, lol?!
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