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Sexing Betta Mandor

Home Forums Fresh and Brackish Water Fishes Sexing Betta Mandor

This topic contains 11 replies, has 4 voices, and was last updated by  Enda 9 years, 1 month ago.

Viewing 12 posts - 1 through 12 (of 12 total)
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  • #300263

    Enda
    Participant

    Dear All,

    I’ve had a couple of Betta mandor for some months now, that were both sexed as male. I’d like some help in learning how to sex them, so that I might possible find a female in the future.

    This is a recent photo of my dominant male.

    This is the subdominant fish, in an early photo, also sexed as male. This is stress colouration

    What is the best way to sex this fish?
    The profile on the KB suggests using the colour of the opecular bands and the length of unpaired fins.

    Cheers,
    Enda

    Attached files

    #314378

    oaken
    Participant

    What I noticed was that females were always a dull brown and didn’t have the more pointed fins that the males have. I’d say the fish in the second picture is also a male, as well.

    #314379

    Matt
    Keymaster

    From the description paper:

    “Adpressed posterior rays of dorsal fin of male reaching caudal-fin base, adpressed posterior rays of anal fin reaching end of anal fin. Adpressed posterior rays of dorsal fin of female not reaching caudal-fin base, adpressed posterior rays of anal fin reaching half of caudal fin.”

    and

    “Colour dimorphism present, males sometimes totally jet black and female brownish.”

    …which is basically a long-winded version of what Gustav said. /smile.gif” style=”vertical-align:middle” emoid=”:)” border=”0″ alt=”smile.gif” />

    #314381

    retro_gk
    Participant

    Look for the ovipositor on mature females. Shows up as a white dot just in front of the anal fin.

    #314385

    Enda
    Participant

    Hmm… thanks all for the info guys.

    Retro, I was wondering if the presence of the white dot is always a reliable sign for sexing. My experience with Betta imbellis is that sometimes males have a white dot too.

    I think fin length, as from the description paper, might be the simplest way to sex. The problem is, many fish come in with damaged fins. It seems that colour is a good way to tell in conditioned specimens. The problem with this being that most newly important fish won’t show good colours.

    Matt, do you have a pdf of the description paper, Tan, H.H. and P.K.L. Ng. – Ichthyol. Explor. Freshwat. 17(2):97-114. 2006 “Six new species of fighting fish (Teleostei: Osphronemidae: Betta) from Borneo.”? Do you think you could send it to me please?

    #314386

    retro_gk
    Participant

    Some males show a white spot (especially if they’re well fed), but it is rarely as prominent as on females.

    #314419

    Enda
    Participant

    Thanks retro, I’ll bear that in mind when sexing fish next time.

    Anyway, here’s another photo of my male mandor`flaring. I love the blue-green sheen on the anal and caudal fins. Not a very good photo, but it captures the actual colour well.

    Attached files

    #315102

    Enda
    Participant

    Hi everyone, I have another fish, acquired in a separate batch that also was sold as Betta mandor. However, it seems considerably different from my male, shown in the pix above. It does not have the same blue-green colouration; instead its colour is mainly reddish-brown. Its unpaired fins are nowhere as long; I’ve had it for some three months now and its fins don’t show any evidence of growing longer. Its caudal fin also does not have the same clean spade shape, although this may be due to previous injury. However, it is more aggressive than my current male (in fact its the dominant one now), so I assume it is a male too (?). Can anyone help with an ID? Is this mandor and what sex?

    Any help is much appreciated!

    Attached files

    #315103

    retro_gk
    Participant

    The new purchase looks like B. strohi to me. Upper part of the tail produced into a point as opposed to the middle.

    As to sex, possibly a male.

    #315109

    Enda
    Participant

    QUOTE (retro_gk @ Sep 21 2009, 12:59 PM) < {POST_SNAPBACK}>
    The new purchase looks like B. strohi to me. Upper part of the tail produced into a point as opposed to the middle.

    As to sex, possibly a male.

    Thanks Retro, I suspected that it might be Betta strohi . Any other input, anyone else?

    Anyway, I’m going to sell these two fish soon, cos I’m moving house and will be overseas for a month. I’m taking the opportunity to revamp my setups.

    #315115

    Matt
    Keymaster

    Male strohi for me too Enda.

    #315119

    Enda
    Participant

    Okay, thanks Matt

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