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Zule 04-10-2008 09:40 PM

Need an ID
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.

herefishy 04-10-2008 10:14 PM

Guessing here. Maybe be a flame tetra, Hyphessobrycon flammeus.


tophat665 04-10-2008 11:15 PM

That's not a flame tetra. I've see those before too. Petsmart carries them sometimes. I've run across them online too. Let me see what I can do.

tophat665 04-10-2008 11:19 PM

Got it! Aphyocharax paraguayensis - the Rio Paraguay tetra.

There are some other tetra species that mimic Corydoras hastaus, but I am pretty sure that Petsmart was calling them Paraguay White Tip tetras.

Zule 04-10-2008 11:38 PM

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.

Thanks again!

The-Wolf 04-11-2008 01:09 AM

you are correct in that they are Dawn tetras, however they are not Aphyocharax paraguayensis
the correct scientific name is Hyphessobrycon eos and is a different fish.

regardless of that both species are very nippy and expect ant other fish in the tank to start missing fins

tophat665 04-11-2008 09:07 AM

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.

The-Wolf 04-11-2008 01:16 PM


Originally Posted by tophat665
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.

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