Need help to ID a Rhom

[BushFishRox]

I know a Rhom is a Rhom, but I was just wondering if anyone could ID this fish, since Rhom is just a general name for a group of fish...

Because he has red in the anal fin, and the gill plates. I think it could be 2 possibility but I am a piranha newb, I think it could be?:

Gibbus

Or

***ana (aka Gheyana apparently haha)

Am I just way off? what do you guys think?

 

[Tango374]

I think you're way off....
Just kidding.

He's young yet, he's going to fill out alot as he gets older.
I do not care what anybody says....you absolutely can not identify a fish as being a gibbus just through visual inspection. Theres no way.
While your fish is somewhat elongated...you cannot even begin going the gibbus route without knowing a collection point.
And for the most part when it comes to visually id'ing rhoms....there are only two kinds....those that sparkle and those that don't. And thats it.
Nobody can be right on saying "thats a peru rhom" or guyana, or vinny, or bolivian....They can't based solely on what the fish looks like. Alot people think they can but in the end there is no way to be certain.
If its that important have the sellar track down where the collection point was.

 

[BushFishRox]

I doubt the store could track the info, it is a Chinese shop and they had at least 6 rhoms in there at the time and it looked like there were a few different morphs there so I doubt they would be able to tell which one was mine and where it came from.

Instead of thinking of Xingu, Gheyana, Diamond, etc. as a location of collection why not just associate those names with the morph? because it is apparent that there are different morphs of rhoms other wise they would all look the same no mater where collected.

 

[JohnnyZanni]

Serrasalmus Rhombeus.

There is certain things that give rhoms the names you provided (Diamond, Xingu ect..)

They are all the same fish they just look a little different.

 

[BushFishRox]

They are all the same fish they just look a little different.

That is what morph means, also from further looking a Gibbus is actually a Serrasalmus Gibbus. Different from a Rhom I guess because they are not round, rather they are elongated but still related to Rhoms.

So either way if it is a Rhom or a Gibbus it will be a cool fish, I am just curious what it will look like when fully grown... I dont have patients lol

 

[JohnnyZanni]

No way to tell what it will look like. How big is it?

 

[BushFishRox]

he is 3"s

Also I am trying to ID because the different Rhoms and Gibbus reach different sizes and have slightly different needs so just want to make sure that I plan accordingly to his needs when full grown.

 

[Tango374]

he is 3"s

Also I am trying to ID because the different Rhoms and Gibbus reach different sizes and have slightly different needs so just want to make sure that I plan accordingly to his needs when full grown.

You'll be lucky if that fish reaches 11". Trying to figure out what kind of varient it is isn't going to help you decipher how large it will get. Its kind of believed that Peru rhoms grow the largest....then some believe thats just because of the ease of exporting larger fish out of Peru, giving us larger rhoms.
All and all it's not going to matter. With your fish being in captivity, most rhom keepers experience prove that you will be lucky to grow your fish out a little more then half of what its capable of in the wild. It was a bummer at first to me when I understood that. But now I'd be ecstatic to own a 12" rhombeus that I grew out from 4" or 5". And I'd be EXTREMELY proud of that.
Call your fish whatever you want. If it has glittery scales call it a diamond. If there's a tint of color to it, call it a (fill in the blank with color) diamond. If not call it a black, a Jet Black, Marble rhom, Smoke rhom, Gray rhom. Its just a way to describe what the rhom looks like and nothing more. Personally, I don't do it just for the fact that I've witnessed too much of a change in appearance over time in my rhoms to try to pin it down as "This is what he is". If this one makes it to more then 11"....We'll see.
You are not going to get an idea of how huge this rhom will get, what it will look like or anything else by visually guessing what "morph" or varient it is.
Its just a rhombeus. The best tank fish there is....lol.