This is a discussion on Need an ID within the Characins forums, part of the Freshwater and Tropical Fish category; -->
I investigated another lfs yesterday and saw some tetras that really caught my eye. There's no info that I can find based on the ...
I investigated another lfs yesterday and saw some tetras that really caught my eye. There's no info that I can find based on the name they were labeled as: hummingbird tetras. So, who better to ask than the fish gurus here? Here are some (horrible) pictures.
That would appear to be it. :) Also known as panda, or dawn tetra, apparently. Thanks for the help, I was getting real sick of going through tons of websites and the same tetras, none of them being mine. I'm guessing this species doesn't get much attention, as the only thing that's getting me any solid facts is the scientific name. Too many common names floating around.
Both H. eos and A. paraguayensis go by the name of Dawn Tetra and have C. hatatus mimicking coloration.
I can't give you precise distinguishing characteristics (except that A. paraguayensis is from Paraguay and H. eos is from Guyana). However, in general, Aphocharax species lack an adipose fin and Hyphessobrycon species have one. Also, from what I have been able to find (and it was sketchy), A. Paraguayensis has black and white markings on the anal fin (visible in the picture) that H. eos lacks.
So I definitely agree that this was one of those, and that, without finding a good morphological description of each there's no way to tell.
That said, you're absolutely right in saying that both are hyperactive and inclined to nip and do best in a well planted species tank with plenty of swimming room.
However, in general, Aphocharax species lack an adipose fin and Hyphessobrycon species have one
which is why I said H.eos :) (both fish in the insert of the first pic clearly show an adipose fin)
I have searched, in the past, many scholarly papers and have found no definitive answer to which is which, personally I have kept them both (one with and one without the adipose) and even at one time had Fugitive tetras Odontostilbe fugativa, C.hastatus and C.pygmaeus in the same tank, they all acted as one big school.
the only fish that got nipped fins from this bunch were some Roberti tetra Moenkhausia robertsi which were the only other inhabitants of that tank.