Clues:
1. A new fish discovered in Amazon River channel.
2. It is unique among apteronotid knifefishes.
3. It is a member of an informal species-rich suprageneric taxon in the Apteronotinae known as the navajini.
4. It measures 10-15 cm in size.
This medium sized freshwater gamefish is called a pavón over much of it's native range. It reaches up to 3' in length, yet is still sometimes kept by aquarist who have more tank space than sense.
There are 5 recognized species (maybe many more out there) - we're looking for the most common and 2nd largest.
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