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A. piaroa is A164.
A165 is A. cf. piaroa (Rio Negro). Do you know the catch location? Does he sometimes show a large black blotch on the caudal peduncle?
If the black blotch on the caudal peduncle is never larger than in this photo, in particular if it never extends into the upper half of the caudal peduncle, it's most likely A. piaroa (A164).