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how to sex young fish from regani complex

Discussion in 'Apistogramma' started by Matthias.couckuyt, Apr 15, 2019.

  1. Matthias.couckuyt

    Matthias.couckuyt New Member

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    Hi,

    I recently saw a nice picture on how to sex juvenile fish from the nijsseni complex (from mike wise)
    Does this exist for regani complex?

    I have a lot of 2 month old Ortegai juveniles and was wondering on when I would be able to determine their gender.

    Kind regards,
    Matthias
  2. Mike Wise

    Mike Wise Moderator Staff Member 5 Year Member

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    Not that I know about. If they show no differences then they are too young. Behavior might be an indicator, but not always.
    Matthias.couckuyt likes this.
  3. Matthias.couckuyt

    Matthias.couckuyt New Member

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    Hi Mike,

    Thanks for your reply!

    They indeed show differences.
    I can see that most of the fish have a thick black border in their pelvic fins, a lot more than even my adult males have. So i'm quite sure these are females.
    They also show more black in the first 3 spines of their dorsal fin.
    Also less spaces in the blacks on the bottom of their dorsal fin.

    I think I have around 3 males and 7 females but they are only 2 cm so I will wait a little bit longer to be sure.
    Sorry that not all pics are as sharp as they should be :)

    1. Females
    1.jpg
    2. Female 2.jpg
    3. Female and male below 3.jpg
    4. Female 4.jpg
    5. male 6.jpg
    7. male 7.jpg
    8. females 8.jpg
    9. female 9.jpg
    10. male 10.jpg
    11. female 11.jpg
    12. female 12.jpg 13.jpg
    13. female 14.jpg

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  4. mrjbacon

    mrjbacon Member

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    I can't say for certain but I'm pretty sure the ones with black on the pelvic fins are all females. It's possible you have one or two males mixed in with them, but like Mike said, it's difficult at this point. The other ones look like definite males. If you can separate them, try putting all the juvies with black pelvic fins in their own tank and see if any males start expressing in the following weeks.
  5. Matthias.couckuyt

    Matthias.couckuyt New Member

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    I agree mrjbacon.
    And thanks for the good tip!
  6. Matthias.couckuyt

    Matthias.couckuyt New Member

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    should I trust the black spots and space between the black spots on the bottom of the dorsal finn more than the blacks on the pelvic fin and first spines of the dorsal fin?
    All my females have 3 non black spaces on the dorsal finn while all my males have more non black spaces in between the blacks. ( I hope everybody understands what I mean )
  7. Mike Wise

    Mike Wise Moderator Staff Member 5 Year Member

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    Please realize that juvenile males look just like juvenile females for the first few months.
  8. Matthias.couckuyt

    Matthias.couckuyt New Member

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    Hi Mike,

    Yes i do realize, but I was wondering if the black markings on the dorsal finn change or not.

    Attached Files:

  9. Mike Wise

    Mike Wise Moderator Staff Member 5 Year Member

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    Dosal spots vary with the species, not so much with sex. These dark patches can expand and contract on the same fish depending on its mood. For your ortegai-subcomplex species I would look for the more colorful stripe through the middle of the dorsal fin to recognize males than looking at the width of the dorsal spots.
    dw1305 likes this.
  10. vpik001

    vpik001 Member

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    If it is not too difficult, could you please post here the link to that thread where Mike explained how to sex juvenile fish from the nijsseni complex?

    Thanking you in advance
  11. Matthias.couckuyt

    Matthias.couckuyt New Member

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    Sorry @vpik001 , can't seem to find it immediately