Can I get an ID on this "black piranha" I just bought?

[dudey]

also that fish is way to small to positively id as a rhom. could be sanchezi, rhom, or compressus. hard to tell at this young age, wait till it grows.

if scutes seem to be in a regular order and in kind of random positions you can rule out sanchezi.

wait till you grow it out a bit and then take new pics and focus on it's belly scutes.

 

[HarlanAshmore]

looks nice

 

[Diogenes]

its a rhom, and with out knowing where it was collected from that is all you will be able to tell. the only way to know if its a xingu is to know if thats where it was collected from. so you could ask the guy at the shop if he could find out the collection point. that would be the only to get the answer you are after

Finally a post from a professional.. i was losing hope in the users that visit the piranha forum..

Listening to people that dont know anything argue is actually quite amusing

To the question at hand:
A rhombeus is a rhombeus, and thats that.. Though some localities tend to produce rhoms that look a certain way, there is no way to pinpoint where the exact fish came from. You have a very nice rhom there and you should be happy with that. I would also reccommend getting him onto some type of food that doesnt include live, and feed him as much as posible as often as he will eat. The novice post earlier about him being a "high back" is just pointing to the area in which you can tell that this fish is underfed and extremely malnourished and the potruding bone will dissappear into his fat stores when he gains a little bit of weight..

And a word of advice..
You may want to listen a little more closely to the people here that have piranhas in there signature, these are the people that tend to have a bit more knowledge when dealing with these fish... theres just only so much you can learn from books..

Happy posting

also that fish is way to small to positively id as a rhom. could be sanchezi, rhom, or compressus. hard to tell at this young age, wait till it grows.

if scutes seem to be in a regular order and in kind of random positions you can rule out sanchezi.

wait till you grow it out a bit and then take new pics and focus on it's belly scutes.

with all the above.

As to whether or not it's a rhom, well it's true that at that size it's hard to tell from morphology, the head shape is indicative of a rhom. Given the large number of rhoms imported vs other serra species, it's probably a rhom.