Help to confirm ID, please

[larryl]

Hi -

I was sold this pair as "yellow A. agassizii", can anyone help confirm or deny? Here are two pics of each one:

Thanks!
Larry

 

[larryl]

Sorry, just realized there's an "identification" forum - I should have put this thread there...

 

[Mike Wise]

It's A. agassizii, probably one of the Net/Netz populations. 'Yellow' is just a descriptive term. Anyone can put it on any yellowish aggie.

 

[larryl]

Awesome, thanks @Mike Wise. I googled around but did not find much explaining "Net/Netz population" - does that refer to a habitat region, or a particular color pattern, or both?

 

[Mike Wise]

A. agassizii, as it is presently recognized, is a 'superspecies'. It is composed of at least 7 separate species. I've been told by others more knowledgeable that there are even more. The Net/Netz forms of A. agassizii [A. cf. agassizii (Netz/Net)] is a group of populations that develop dark pigment around the outer edges of each scale on the flanks, forming a net-like pattern. They also tend to have a more robust body and males, when fully mature, develop very long tips on the dorsal and anal fins. The Netz form is found in rivers entering the Amazon from the north, from the Rio Negro eastward to the Rio Jari near the mouth of the Amazon. The Netz form most commonly sold commercially is A. agassizii Alenquer.

 

[larryl]

Thanks @Mike Wise , that info is much appreciated.