I was thinking about these fish and decided to do some digging around. There is virtually no specific information about them except (fish base) they grow to about 4” SL and come from the upper Tapajos River basin in Brazil. The picture above is from Alf Stalsberg’s site which shows a picture and a name but no information what so ever. These fish may actually be a sub-species or transitional species between two others (this is pure speculation on my part). From what I’m able to ascertain, they are occasionally available in the hobby but I’m not sure they are targeted or just a by catch that comes in with other species, because in every instance their identity is questioned. Aquidens rondoni was first described by Miranda Ribeiro in 1918 but there is almost no other information available. Does The Wetspot have any information available pertaining to the origin of these fish? Otherwise the closest ID might be considered Aquidens sp. cf. rondoni but again this is just my opinion based on the original picture. HTH.
