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Related Experiment Videos

Steroid profiles during spawning in male common carp.

T P Barry1, A J Santos, K Furukawa

  • 1Department of Fisheries, Faculty of Agriculture, University of Tokyo, Japan.

General and Comparative Endocrinology
|November 1, 1990
PubMed
Summary

Mating triggers a gonadotropin (GtH) surge in male carp, leading to distinct steroid profiles. Some males rapidly shift from androgen to progestogen production, a pathway inhibition model is proposed.

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Area of Science:

  • Reproductive endocrinology
  • Fish physiology
  • Steroidogenesis

Background:

  • Hormonal regulation of reproduction in fish is complex.
  • Steroid profiles change during spermiation and spawning.
  • Gonadotropin (GtH) plays a key role in mediating these changes.

Purpose of the Study:

  • To investigate the steroid hormone profiles in male common carp (Cyprinus carpio) during mating and spawning.
  • To correlate changes in steroid levels with gonadotropin (GtH) surges.
  • To elucidate the steroidogenic pathways involved in male carp reproduction.

Main Methods:

  • Measurement of testosterone (T), 11-ketotestosterone (11-KT), 17 alpha-hydroxy-4-pregnen-3-one (17-P), and 17 alpha,20 beta-dihydroxy-4-pregnen-3-one (17,20 beta-P) levels.
  • Correlation of steroid profiles with gonadotropin (GtH) levels.

Related Experiment Videos

  • Observation of male carp under different mating conditions (with ovulatory/non-ovulatory females) and temperature increase.

    • Main Results:

    • Males mated with ovulatory females exhibited a GtH surge and spawned, with two distinct androgen/progestogen profiles observed.
    • "High" males showed a rapid shift from androgen to progestogen production post-GtH surge.
    • "Low" males and males mated with non-ovulatory females displayed different steroid responses without a significant steroidogenic shift.

    Conclusions:

    • Mating and spawning induce significant hormonal changes in male carp.
    • A steroidogenic shift from androgen to progestogen production occurs in some males, potentially regulated by 17,20 beta-P.
    • The findings provide insights into the hormonal control of spermiation and spawning in common carp.