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Gonadal steroidogenesis and the possible role of steroid glucuronides as sex pheromones in two species of teleosts

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Abstract

In general, female zebrafish,Brachydanio rerio, ovulate only in the presence of males. The stimulant must be pheromonal as even male holding water is capable of inducing ovulation. After ovulation the mating phase begins. During this phase the male follows the female and oviposition as well as fertilization takes place. Both the ovulation and the mating are controlled by pheromones synthesized by the gonads. Ovulation can be induced by testicular homogenates. After the lipid material has been extracted from the testicular homogenates, the remaining aqueous phase can still induce ovulation. However, when the aqueous phase is treated with the enzymeβ-glucuronidase, it loses the ability to induce ovulation. This is an indication that glucuronides, probably steroid glucuronides, are the compounds responsible.

During the mating phase, ovulated female zebrafish become attractive to males. It was found that, after ovulation, ovarian extracts contain the compounds responsible for attracting males. The attractant consists of a mixture of steroid glucuronides.

After incubation of the gonads with3H-precursors seven steroid glucuronides have been identified in the testis and five in the ovary.

Under fish culture conditions the African catfish,Clarias gariepinus, can produce postivitellogenic oocytes throughout the year. However, in capitivity neither males nor females spawn. In female catfish maturation and ovulation can be induced by treatment with gonadotropins. It might be possible that, analogous to the zebrafish, some reproductive processes in the catfish have to be induced by pheromones. It has been demonstrated that pheromonal compounds released by the seminal vesicles are involved in the attraction of female conspecifics. The steroid glucuronide synthesizing capability of the testes and the seminal vesicles of the male catfish are examined, as well as that of the ovary before and after ovulation of the female catfish. Both testes and seminal vesicles appear to be capable of steroid biosynthesis but only the latter synthesizes steroid glucuronides. Six of these conjugates have been isolated and identified. In the female catfish the ovaries are capable of synthesizing seven steroid glucuronides, but only after ovulation.

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Authors and Affiliations

  1. Zoological Laboratory, Research Group for Comparative Endocrinology, University of Utrecht, Padualaan 8, 3584 CH, Utrecht, The Netherlands

    J. G. D. Lambert, R. van den Hurk, W. G. E. J. Schoonen, J. W. Resink & P. G. W. J. van Oordt

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  1. J. G. D. Lambert
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  2. R. van den Hurk
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  3. W. G. E. J. Schoonen
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  4. J. W. Resink
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  5. P. G. W. J. van Oordt
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Lambert, J.G.D., van den Hurk, R., Schoonen, W.G.E.J. et al. Gonadal steroidogenesis and the possible role of steroid glucuronides as sex pheromones in two species of teleosts. Fish Physiol Biochem 2, 101–107 (1986). https://doi.org/10.1007/BF02264077

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