Help with ID

[Seth627]

Friend was given roughly 50 of the fish pictured below. Believe it to be vieja bifasciatus of some sorts but we don’t know. He got them from someone who bred and collected tons of species. Original owner wasn’t completely sure we’re parents were collected. Just recently moved so colors are a bit dull at the moment. Any help is greatly appreciated. Apologies if this should be posted elsewhere.

 

[Jexnell]

Look like Hartwegi to me

 

[Serpentine]

I do think they are Vieja bifasciatus. They aren't fully colored up but I bet they will be gorgeous when they do. No guesses on locality though.

 

[duanes]

Hartwegi is often differentiated from other Vieja, by having a slight over bite, which may or may not be evident in your photo.

I edited it a little to make that important characteristic visible (or not).
Here is a shot of a young Vieja bifasciatta to compare, at a young age, colors are of little use when trying to I.D., many Vieja are almost generic at that point.

As you can see color has not yet developed , below a shot of the same fish, mature.

at maturity there is no distinct over bite on bifasciatta.

 

[Seth627]

Added information, the parents were caught in the Usumacinta River. Took some digging but the owner of the pair these came from was able to provide that. So that answers locality. Thanks for all the inputs!

 

[duanes]

Hartweg is found in Chiapas, in the Rio Grijalva drainage, and Rio Grande de Chiapa.
Bifasciatta is much more wide spread and does come from the Usumacinta.

 

[Seth627]

Thought I would share an updated photo for everyone. Really coloring up nicely.