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Sex Ratio In Macropodus

Home Forums Fresh and Brackish Water Fishes Sex Ratio In Macropodus

This topic contains 0 replies, has 1 voice, and was last updated by  plesner 5 years, 7 months ago.

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  • #302049

    plesner
    Participant

    In a Danish language forum we’ve had a discussion about the sex ratios in several species of Macropodus. Especially M. spechti often produces around 90% males. We were wondering what kind of factors we could ‘adjust’ to get a more even sex ratio.

    The only text I could find dealing with the topic of sex ratios in Macropodus species was ‘Francis, R.C., The effects of bidirectional selection for social dominance on agonistic behavior and sex ratios in the paradise fish (Macropodus opercularis), Behaviour, Aug 1984. v. 90’. It’s quite an interesting paper, but M. opercularis tends to produce fairly equal numbers of males and females, so we have to do some more searching.

    Can anyone point me towards texts about factors influencing sex ratios in other species of Macropodus or tell a bit about his/her personal experience of getting a more even sex ratio in Macropodus species?

    #347410

    Matt
    Keymaster

    Hi plesner, Paepke mentions and speculates on this phenomenon in his book ‘Die Paradiesfische’ (1994). He seems to conclude there are potentially a number of factors involved, and that further study is needed.

    I can scan the relevant section for you if you like, but it is in German.

    #347423

    plesner
    Participant

    QUOTE (Matt @ Feb 29 2012, 08:09 PM) < {POST_SNAPBACK}>
    Hi plesner, Paepke mentions and speculates on this phenomenon in his book ‘Die Paradiesfische’ (1994). He seems to conclude there are potentially a number of factors involved, and that further study is needed.

    I can scan the relevant section for you if you like, but it is in German.

    Hi Matt.

    I just reread chapter 3.3 in ‘Die Paradiesfische’. It’s been 15+ years since I read it, so I didn’t even remember that Paepke had an opinion on this topic.

    I’m considering trying to get my hands on Schwier’s text on the same subject (which Paepke refers to), but where does one even start trying to find something like that from 1939? I’m not even sure I understand half of what’s written about that particular publication:

    Schwier, H (1939): Geschlechtsbestimmung und -differenzierung bei Macropodus opercularis, concolor, chinensis und deren Artbastarden. – Z. ind. Abst.-Vererb.-lehre. 77:291-335.

    #347424

    Stefan
    Member

    A combination of pH, dGH, temp and what not plays a role in that but I’m pretty sure there’s no definitive clear cut answer/solution to the ‘issue’. Trial and error seems your best option?

    #347426

    plesner
    Participant

    QUOTE (Stefan @ Mar 1 2012, 06:39 PM) < {POST_SNAPBACK}>
    A combination of pH, dGH, temp and what not plays a role in that but I’m pretty sure there’s no definitive clear cut answer/solution to the ‘issue’. Trial and error seems your best option?

    Yeah, I kind of gathered as much. I just hoped to cut a few corners rather than having to do all the testing over again.

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