Summary
In half-grown immaturePterophyllum scalare it is possible to induce expansion of melanophores and the spawning reflex response by injections of 0.0005 mg reserpine per g body-weight. The first effect occurs 1 to 3 hours after injection, the second 6 to 8 hours later. Spawning response is shown in typical manner but there is no protrusion of the genital papilla or ejaculation of sperms. The number of spawning reflexes observed per animal is between 2 and 10 within 60 to 90 minutes. Further injections of reserpine are without any effect. There is some evidence that reserpine is stimulating the release of hormones of the anterior (MSH — expansion of melanophores) and of the posterior lobe of the pituitary gland of which Ichthyotocin may be responsible for the initiation of the spawning reflex response.
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Die Experimente zu dieser Mitteilung wurden im Zoologischen Institut der Universität Frankfurt a.M. durchgeführt. Ich danke den Herren Prof.Burkhardt und Prof.Lindauer für die Überlassung eines Arbeitsplatzes und der Deutschen Forschungsgemeinschaft für die finanzielle Unterstützung.
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Blüm, V. Die Auslösung des Laichreflexes durch Reserpin bei dem südamerikanischen BuntbarschPterophyllum scalare . Z. Vergl. Physiol. 60, 79–81 (1968). https://doi.org/10.1007/BF00737096
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DOI: https://doi.org/10.1007/BF00737096