Urine of ovulated female masu salmon (Oncorhynchus masou) contains a priming pheromone which increases plasma 17,20b-dihydroxy-4-pregnene-3-one level in mature male parr

Yambe H., Konno S., Kitamura S.

Date de parution: juillet 2008
Volume: 32
Number: 2 suppl.
Pagination: 307
Editeur: Société Française d'Ichtyologie
doi: https://doi.org/10.26028/cybium/2008-322SP-150

Recently, we have reported that ovulated female masu salmon excrete L-kynurenine (Kyn) as a releaser pheromone for conspecific spermiating males. In this study, we tested a primer effect of ovulated female urine and Kyn to males. Blood sample and the expressible milt were collected before exposure and 3 hours after exposure. All test groups showed no significant effect on volumes of expressible milt. However, exposures to ovulated female urine (OFU) and Kyn induced significant elevations in plasma 17,20b-dihydroxy-4-pregnene-3-one (17,20b-P) concentrations 3 hours after introducing odours. We suggest that the urine of ovulated female masu salmon and Kyn had a primer effect.

Mots-clés: L-kynurenine - Masu salmon - Oncorhynchus masou - Sex pheromone - Urine
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