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Corydoras ID
September 15, 2012
10:29 pm
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Kajsa12
The Netherlands
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October 24, 2009
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Hi all,

 

A fellow member on a Dutch forum bought some Corydoras recently.

They were sold as C. julii, but are obviously something different.

One is most probably C. trillineatus, but the other one is not.

 

Here's a picture of the unknown one (with permission ofcourse).

Does anybody know the ID of this one?

http://i472.photobucket.com/albums/rr85/kajra7/Cory1.jpgImage Enlarger

September 16, 2012
8:48 am
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Rüdiger
Brunswick / Germany
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Hi there.
I'd put my money on C. agassizii.
Regards
R.

If you must insist on living in a box ...... at least do your thinking outside.
September 17, 2012
11:18 am
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Kajsa12
The Netherlands
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Hi Rüdiger,

 

Thanks for your reply.

My first thoughts were C. ambiacus, but I'm not really a Corydoras expert.

C. agassizii  looks like a good option, too.

What would be the differences between those two species?

September 17, 2012
12:14 pm
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The.Dark.One
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I too think C. ambiacus

See my catfish images at http://www.scotcat.com/thedarkone/thedarkone.htm
September 17, 2012
7:16 pm
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Graham Ramsay
Blairgowrie - UK
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Kajsa12 said
Hi Rüdiger,

 

Thanks for your reply.

My first thoughts were C. ambiacus, but I'm not really a Corydoras expert.

C. agassizii  looks like a good option, too.

What would be the differences between those two species?

Well C. agassizii is supposed to have a more restricted blotch at the base of the dorsal. C. ambiacus is meant to have a slightly concave snout too. However they are both variable, especially when young. Knowing the source isn't much help either as they are sympatric.

These spotted ones are always tricky and I wouldn't want to pin this specimen down to species level.

September 18, 2012
7:46 am
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Rüdiger
Brunswick / Germany
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Hi all.
I am by no means an expert myself.
Of course you are absolutely right Graham. But I bought a group of young C.agassizii at a wholesaler a while back and they looked identical to the one pictured here. As they grew, the blotch on the dorsal literally travelled upwards, i.e. it got less at the base and filled out towards the tip without reaching it. My C. ambiacus showed a much more metallic sheen even when young. That could however be a matter of light and photografie. And there's always the not so faint possibility that my 'agassizii' were misidentified somewhere between collection and sales.
@ Kajsa12: another distinguishing feature is supposedly the alignment of the lateral spots. In C. agassizii they should be arranged in 3 approximate lines. But as Graham pointed out, those buggers are quite variable. Assuming that the pictured specimen is indeed very young still I'd say lets have another go at ID'ing the fish after about 10 weeks.
Regards
R.

If you must insist on living in a box ...... at least do your thinking outside.
September 19, 2012
9:47 am
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Kajsa12
The Netherlands
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Thanks for the replies.

 

I also think this specimen is still very young, so we will have to wait a few weeks and see what differences we can observe.

September 19, 2012
10:40 am
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DutchCory
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September 15, 2012
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I have no idea how old the cory is the only thing i know for sure that it is bigger then the trilineatus it shares the tank with and has a green metallic shine on its cheeks of which the green might just be the reflection of the rounded gravel, and that it isn't the julii it was sold for

September 19, 2012
10:41 am
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DutchCory
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September 15, 2012
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It is my cory by the way ;)

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