Silver dollar i.d?

[justarn]

Hi all, I have 5 dollars. I'm curious as to the identification of them. Three look like skinny regular 4-5" dollars but two almost look like mini pacu, alot more chunky with orange chins?
Are they the same species or is this just a difference in sexes?

 

[kno4te]

Look like metyinnis hypsauchen.

 

[kno4te]

Bottom look argenteus.

 

[tlindsey]

Hi all, I have 5 dollars. I'm curious as to the identification of them. Three look like skinny regular 4-5" dollars but two almost look like mini pacu, alot more chunky with orange chins?
Are they the same species or is this just a difference in sexes?

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They are the same specie imo but not sure about the ID. My spotted color up also the males will show the most color especially when in the mood to spawn.

 

[justarn]

I bought them at different times from different LFS obv just labelled as dollars.
Tbh they all look the same to me when I look up the difference.

 

[justarn]

The pacu chunky looking ones have a bump in their anal fins and the smaller ones don't, are the chunky ones female?

 

[justarn]

Greedy little sods, they have quite powerful jaws too, bite lumps out off squid rings.