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  • Changes in plasma levels of gonadal steroids and putative gonadotropin in association with spawning and brooding behaviour of male demoiselles

    Author(s)
    Pankhurst, N.
    Peter, R. E.
    Griffith University Author(s)
    Pankhurst, Ned W.
    Year published
    2002
    Metadata
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    Abstract
    Nesting male demoiselles Chromis dispilus were captured and blood sampled under water by divers, and plasma levels of reproductive hormones correlated with behavioural status at the time of capture. Plasma gonadotropin-II (dGtH-II) was measured using a heterologous assay based on carp GtH-II standards and an antibody to the ߭subunit of cGtH-II. Plasma samples diluted parallel to standards in the assay, and there was a significant transient increase in dGtH-II in response to treatment with gonadotropin releasing hormone analogue (GnRHa). Male demoiselles had elevated plasma levels of dGtH-II during periods of reproductive ...
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    Nesting male demoiselles Chromis dispilus were captured and blood sampled under water by divers, and plasma levels of reproductive hormones correlated with behavioural status at the time of capture. Plasma gonadotropin-II (dGtH-II) was measured using a heterologous assay based on carp GtH-II standards and an antibody to the ߭subunit of cGtH-II. Plasma samples diluted parallel to standards in the assay, and there was a significant transient increase in dGtH-II in response to treatment with gonadotropin releasing hormone analogue (GnRHa). Male demoiselles had elevated plasma levels of dGtH-II during periods of reproductive display, but low levels of dGtH-II during periods of brooding, irrespective of egg stage. Plasma testosterone levels followed a similar pattern whereas plasma 11-ketotestosterone and 17,20߭dihydroxy-4-pregnen-3-one levels tended to remain elevated during the early phases of egg brooding. The results are consistent with earlier studies showing that reproductive hormone levels in demoiselles are behaviourally mediated, and support the view that behavioural alterations of reproductive endocrine status in fishes are mediated through the action of GnRH.
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    Journal Title
    Journal of Fish Biology
    Volume
    61
    Issue
    2
    Publisher URI
    https://onlinelibrary.wiley.com/doi/10.1111/j.1095-8649.2002.tb01572.x
    DOI
    https://doi.org/10.1111/j.1095-8649.2002.tb01572.x
    Subject
    Ecology
    Zoology
    Fisheries Sciences
    Publication URI
    http://hdl.handle.net/10072/20617
    Collection
    • Journal articles

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