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I can't say for sure. The fish in the back in photo 2 and photo 15 appear to be A. piaroa. The fish in photo 3 appears to be A. megaptera. I hate to say it, but you might have a mixed lot of Breitbinden forms. Separating the females might be a real bear! Hopefully, they're all just young A. piaroa in which the males haven't developed the highly serrated dorsal spines.
A 164: A. piaroa
A 165: A. cf. piaroa (Rio Negro)/A. sp. Windisch/A. sp. São Gabriel/A. sp. Schwanzfleck/Tail-spot
A 166: A. megaptera
A 167: A. cf. piaroa (I think it's probably a slender form of A. piaroa that Staeck introduced as A. sp. Caño Morrocoy, but not positive.)