Jack Dempsey Genders

Discussion in 'Fish, Snail, Worm And Pest ID Help' started by JackDempsey2675, Jun 14, 2016.

  1. JackDempsey2675New MemberMember


    I've recently recieved two Jack Dempsey's for free. Whilst at work my fiancé has seen the locking lips, ive read on many sites that it can either be for mating or in aggression.. she wasnt sure if it was from aggression or not, since as soon as she moved towards the tank they both stopped and swam to the front of the tank wanting food as usual. (When they get fed enough 3-4 times a day).
    Can anyone help me sex these fish as i dont want them to be fighting and either fish to get hurt..



    Last edited by a moderator: Nov 23, 2018
  2. codyrex97

    codyrex97Well Known MemberMember

    No Jack expert but looks male and female to me. Hopefully somebody can confirm.
  3. hampalong

    hampalongWell Known MemberMember

    I would agree. Top is definitely female, bottom looks male. How big are they?

  4. chromedome52

    chromedome52Fishlore VIPMember

    I am afraid I must disagree, I believe both fish are male. Top fish is just less developed than the dominant fish, or is still healing from having had his fins ripped in the past. The most dependable characteristic for sexing Dempsey is the lower cheeks, which are usually bare on males and have blue iridescent streaks and spots on females.
  5. slayer5590

    slayer5590Well Known MemberMember

    I see 2 males as well.
  6. MikeRad89

    MikeRad89Well Known MemberMember

    Agreed. Two males.
  7. OP

    JackDempsey2675New MemberMember

    Would say the bigger one is about 60mm and the smaller one 50mm
  8. OP

    JackDempsey2675New MemberMember

    So does the length help?
  9. chromedome52

    chromedome52Fishlore VIPMember

    It suggests that they are a bit small to sex dependably. The smaller one might still be a female, as Hampalong said. Watch to see if it develops iridescence on the cheeks. Those sizes seem a lot smaller than the fish look in the photos, though.

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