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Maintained aggressive behavior in gonadectomized male Siamese fighting fish (Betta splendens).

C S Weiss, J P Coughlin

    Physiology & Behavior
    |July 1, 1979
    PubMed
    Summary

    Aggressive behavior in male Betta splendens (Siamese fighting fish) persists after gonadectomy, suggesting gonadal hormones may not control this adult aggression. Further research is needed to understand the underlying mechanisms.

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    Area of Science:

    • Ethology
    • Endocrinology
    • Animal Behavior

    Background:

    • Aggressive behavior is common in male Betta splendens.
    • The role of gonadal hormones in regulating aggression is well-established in many species.
    • Previous studies suggest hormonal influence on fish aggression, but specific mechanisms in Betta splendens require further investigation.

    Purpose of the Study:

    • To investigate the role of gonadal hormones in adult male Betta splendens aggression.
    • To determine if gonadectomy affects aggressive behavior in this species.
    • To explore alternative explanations for maintained aggressiveness post-castration.

    Main Methods:

    • Adult male Betta splendens were subjected to gonadectomy.
    • Aggressive behavior was assessed using a mutual viewing test two weeks post-surgery.

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  • Control groups included intact fish and sham-operated fish.
  • Testis regeneration was also monitored in some gonadectomized individuals.

    • Main Results:

    • Gonadectomized Betta splendens maintained high levels of aggressive behavior across all six measured indices.
    • Aggressiveness in gonadectomized fish equaled that of control groups.
    • Fish exhibiting partial testis regeneration and sham-operated fish also displayed aggression levels comparable to controls.

    Conclusions:

    • Adult aggressive behavior in male Betta splendens appears to be independent of gonadal hormone control.
    • Maintained aggressiveness following castration suggests the involvement of other physiological systems.
    • Possible explanations include the influence of pituitary gonadotropins, the interrenal gland, or critical period developmental effects.