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Red-nosed tetras
January 4, 2014
11:15 pm
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KittyKat
Norwich, UK
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I've been trying to get a positive ID on my rummy-nose/firehead tetras between Hemigrammus bleheri, H. rhodostomus and Petitella georgiae. All three tetras grow to the same size and have similar body shape and colouration.

Does anyone know of a canonical method for distinguishing between the three species?

I have found various drawing guides online, but they don't correspond to the profile photos on here, nor my fish.

Kat
January 6, 2014
12:00 am
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knutschi
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Show us some pics of your fish :D

January 7, 2014
6:01 pm
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Matt
Málaga, Spain
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Profiles on here need updating to be honest KK.

I've been trying to get hold of the descriptions for literally years but no luck so far. the problem is they were published in aquarium magazines/obscure journals so are very hard to find:

H. bleheri: Tropical Fish Hobbyist v. 34 (no. 11). 1986.

H. rhodostomus: Wochenschrift für Aquarien- und Terrarienkunde v. 21 (no. 18). 1924.

P. georgiae: Vie et Milieu supplement 17. 1964.

If anyone can help find these it would be wonderful.

 

Cake or death?
January 7, 2014
7:47 pm
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KittyKat
Norwich, UK
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I can give a hand with the profiles in a little bit (I've been trying to find those papers on and off for a few years now). Do you know if Wochenschrift für Aquarien- und Terrarienkunde had to be lodged somewhere when it was first published? I have a few friends in Berlin who have access to the University libraries.

@knutschi, I'm breaking down the tank this week to have the flooring replaced as it's a 500 litre, so needs to get moved somewhere else for a few days. I'll do my best to get photos next week, but I am quite interested in figuring out for good how to ID these fish without showing a photo for reference. I'm pretty sure that my lot are a mix of H. rhodostomus and H. bleheri as they have two quite distinct patterns.

Kat
January 8, 2014
1:23 am
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KittyKat
Norwich, UK
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@Matt, at least one of those is available at the British Library: I'll try to have a look at it next time I'm in London.

Kat
January 9, 2014
10:49 pm
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Byron Hosking
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November 3, 2008
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I came across an illustration some years back that to me is helpful.  I can't figure oput how to attach it from my PC, so here is my description of the differences.  H. bleheri is certainly the most colourful and is now the most commonly available of the three, and the one almost certain to be in shops as "Rummy Nose" or similar. This species is easily distinguished from the other two; only in this species does the red colour extend beyond the head onto and past the gill covers. Also, the central caudal fin band extending laterally onto the body of the fish that is quite evident in the two similar species is almost non-existent in H. bleheri. The red colouration is brightest in this species, though this can be misleading as it pales if the fish is under stress and it usually would be in dealer's bare tanks. The "original" Rummynose, H. rhodostomus, is unlikely to be encountered today; I have never seen it locally, but perhaps it is encountered in the UK [I'm in Vancouver, Canada].  P. georgiae is sometimes available and when housed with H. bleheri the two species will all remain together.  I have had two groups of both species together for three years now, and they have remained tightly shoaling as one group.  It is fairly easy to differentiate them from the red intensity and the caudal fin bands.  Petitella georgiae has in my case anyway grown slightly larger too.

 

Hope this helps.

 

Byron.

Byron Hosking, BMus, MA Vancouver, BC Canada
January 11, 2014
4:24 pm
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Matt
Málaga, Spain
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KittyKat said
I can give a hand with the profiles in a little bit (I've been trying to find those papers on and off for a few years now). Do you know if Wochenschrift für Aquarien- und Terrarienkunde had to be lodged somewhere when it was first published? I have a few friends in Berlin who have access to the University libraries.

No idea but will try writing to one or two people as well.

 at least one of those is available at the British Library: I'll try to have a look at it next time I'm in London.

That would be great, and thanks for the offer of profile help too.

Byron, do you have any photos of your Petitella - would be great to see them!

 

Cake or death?
January 11, 2014
11:59 pm
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Byron Hosking
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Byron, do you have any photos of your Petitella – would be great to see them!

Hi Matt...I'll try to take some, but my camera is not the sort that captures clear photos of anything moving.  Is there an instruction here as to uploading photos from a PC?

Byron.

Byron Hosking, BMus, MA Vancouver, BC Canada
January 12, 2014
4:45 pm
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Matt
Málaga, Spain
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Hi Byron, click the 'Upload Attachments' button underneath the text field when replying in a thread. This opens a drop-down box into which you can drag files or add them using the 'Add files' button. Once the files appear in the box click 'Start Upload' and wait until they appear in yor reply before adding the reply as normal.

Hope that helps!

Cake or death?
January 12, 2014
11:06 pm
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Byron Hosking
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Matt said
Hi Byron, click the 'Upload Attachments' button underneath the text field when replying in a thread. This opens a drop-down box into which you can drag files or add them using the 'Add files' button. Once the files appear in the box click 'Start Upload' and wait until they appear in yor reply before adding the reply as normal.

Hope that helps!

 

When I click "Add Files" button, nothing happens.

Byron Hosking, BMus, MA Vancouver, BC Canada
January 12, 2014
11:39 pm
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Rüdiger
Brunswick / Germany
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May 2, 2012
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Byron Hosking said 

 

When I click "Add Files" button, nothing happens.

That function doesnt work in some IE versions! Try chrome! ;-)

Regards

R.

If you must insist on living in a box ...... at least do your thinking outside.
January 13, 2014
2:03 am
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Byron Hosking
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Thanks Rudiger, here goes.

This is the illustration of the three rummy's.  I think this came from Sterba, but not certain.  I've had it for a while.

Rummynose-chart.jpgImage Enlarger

Byron Hosking, BMus, MA Vancouver, BC Canada
January 16, 2014
7:37 pm
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Matt
Málaga, Spain
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Cheers Byron, this is actually the same one I used when doing the profiles. :)

Cake or death?
January 16, 2014
8:24 pm
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Byron Hosking
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Matt said
Cheers Byron, this is actually the same one I used when doing the profiles. :)

Great minds..., I guess.Wink

I have another which has no text, just a photo and illustration of each of the three species; also not sure where this came from.  The earlier with text is a bit clearer.

Byron.

tfh_rummynose_tetras.jpgImage Enlarger

Byron Hosking, BMus, MA Vancouver, BC Canada
January 17, 2014
12:47 pm
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Matt
Málaga, Spain
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Thanks Byron, very useful to see photos of the different caudal-fin patterns side-by-side. Think I'll try and spruce the profiles up over the weekend.

Cake or death?
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