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Thread: What and Where Exactly is the Iris Diverticulum on a Fish?

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    What and Where Exactly is the Iris Diverticulum on a Fish?

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    Anybody knows? Choy?

    Any drawings or pictures to point out exactly what I am looking at? Nothing usable from Google.

    I have read that iris diverticulum can be used as one of the keys to identify some fishes.

    Many thanks.

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    Is this for otocinclus??

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    Hahaha... yes sir, for Oto and the likes.

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    If i am not wrong, i think its the portion of the eye where there is a divide..
    If you look into the Otos eye.. you can see some have perfectly round pupils and some have pupils that have a little slit that comes out of them.. that slit.. i think is the iris diverticulum

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    Thanks, let me go scrutinise some pictures first...

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    seems like all of the armoured cats have this cat-eye like iris,
    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona crumenatum Galleria Botanica

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    Actually it is used to tell some species apart... some of them don't have it..and some of them do. Sometimes even length of this portion is important...at least that is what i read.

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    That's what I read in PlanetCatfish on how to tell O. affinis apart from others. From a lot of pictures labelled as O. affinis that I have seen, they are definitely not the real deal (according to the keys given by PCF).

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    So the picture I posted is affinis or vittatus?
    ~ Vincent ~ Fishes calm your mind...
    http://www.flickr.com/photos/valice/





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    Not O. affinis for sure, could be O. vittatus or O. vestitus or ....

    I think there is a post somewhere asking about the differences. There are basically 3 keys to identifying O. affinis. I will reply the post and cross link here.

    (when I have time... stuck with work at the moment)

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