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Mystery Nannostomus

Home Forums Fresh and Brackish Water Fishes Mystery Nannostomus

Viewing 12 posts - 1 through 12 (of 12 total)
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  • #300030

    Matt
    Keymaster

    I was going to add this pic to the knowledge base as Nannostomus beckfordi but looking at it again I’m not so sure. Am I having a blonde moment or not?

    Attached files

    #312440

    Mark Duffill
    Participant

    Thats a nice one Matt

    Here it is over at Aquaticquotient N.beckfordi

    #312443

    mickthefish
    Participant

    every thing fits for a beckfordi exceptthe red stripe and the red top eye.
    possibly a location caught or if farmbred a slight mutation.

    mick

    #312445

    Mark Duffill
    Participant

    If I remeber rightly Nannostomus nitidus has a slight orange stripe above the black stripe but I dont think it is as pronuonced as that.

    #312446

    mickthefish
    Participant

    Bolton mu has a shoal of nitidus and i’m sure that isn’t the same fish.

    mick

    #312453

    Matt
    Keymaster

    Yup that’s it Mark Chor Kiat Yeo who took the pic has kindly donated a whole series of different species for us.

    #312455

    ulster exile
    Member

    Mine are like that too though… I wasn’t focusing on the pencilfish, but you can clearly see the red over the eye

    Again, not a great pic, but you can see the glint of the red in the eyes of those behind the main character here.

    The one thing I will say about these is that the red strip above the black easily disappears if the fish are stressed. I only notice it coming out (like the thickness of the black stripe) when they are in tip top condition.

    #312461

    Matt
    Keymaster

    I’ve kept what I bought as N. beckfordi and they never had such a defined red line as in CK or Chrissy’s pics even when in super-display mode. So back to (guru) Mick’s original points then.

    #312467

    Mark Duffill
    Participant

    I would say locality variant as I think if they were mutant or farm bred their markings/colours would be weakened.

    #312468

    ulster exile
    Member

    QUOTE (Matt @ Feb 17 2009, 12:19 AM) <{POST_SNAPBACK}>
    Chrissy any idea if the shop you bought them from stock wild fish?

    Sorry Matt, I’ve no idea!

    #312491

    Matt
    Keymaster

    QUOTE (Mad Duff @ Feb 17 2009, 12:08 PM) <{POST_SNAPBACK}>
    I would say locality variant as I think if they were mutant or farm bred their markings/colours would be weakened.

    I was thinking the same; their markings are really well-defined. *strokes chin* Grr we need more smilies!

    #312856

    Byron Hosking
    Participant

    I would think this is a form of N. beckfordi. I have a photo in a late 1990’s Aqualog update that is very close to your fish, and it is labelled as N. aripirangensis [Meinken 1931] a probable synonym for N. beckfordi. Gery [1977] says that N. aripirangensis may be a sibling species or subspecies of N. beckfordi. Weitzman & Cobb did a revision of the Nannostomini in 1975 that I have never come across; if anyone has access to it, it might have more information.

    I have a small shoal of N. beckfordi and there is no indication of a red line on the females but there is on the males, although the brown above the black lateral stripe is so dark the red is quite difficult to see on a couple of them.

    Byron.

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