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Reduced swimming performance and increased growth in domesticated rainbow trout, Oncorhynchus mykiss

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Domesticated populations of rainbow trout (Oncorhynchus mykiss) probably have been selected for high growth rates and large body size, which may have resulted in reduced sprint swimming performance. We hypothesized that more domesticated populations of rainbow trout would have higher growth rates and larger body size, but slower swim speed, relative to semiwild populations. We tested this hypothesis by measuring body mass, body length, and sprint swim speed multiple times over 92days in progeny from crosses between males from three clonal lines and an outbred female. We found significantly higher body masses and significantly slower swim speeds in the highly domesticated Arlee and Hot Creek progeny groups compared with the semiwild Swanson hybrid progeny group, supporting our hypothesis. Growth rates also differed significantly among groups, but at the ages measured, the Swanson hybrid progeny had an intermediate growth rate. However, given the differences in body mass, either growth rates were higher in the more domesticated progeny groups at young unmeasured ages and (or) they hatched at a significantly larger body mass than the semiwild Swanson hybrid.

Les populations domestiquées de truites arc-en-ciel (Oncorhynchus mykiss) ont probablement été sélectionnées pour leur fort taux de croissance et leur importante taille corporelle, ce qui peut avoir conduit à une performance réduite de la nage de pointe. Nous posons l’hypothèse selon laquelle les populations plus domestiquées de truites arc-en-ciel devraient avoir un taux de croissance plus élevé et une taille corporelle plus forte, mais une vitesse de nage plus lente, par comparaison aux populations semi-sauvages. Nous avons testé cette hypothèse en mesurant la masse corporelle, la longueur du corps et la vitesse de nage de pointe à de nombreuses reprises sur une période de 92 jours chez des rejetons de croisements entre des mâles de trois lignées clonales et une femelle exogame. La masse corporelle est significativement plus forte et la vitesse de nage significativement plus lente chez les groupes de rejetons des lignées fortement domestiquées Arlee et Hot Creek, par rapport au groupe de rejetons hybrides de la lignée semi-sauvage Swanson, ce qui confirme notre hypothèse. Les taux de croissance diffèrent aussi parmi ces groupes, mais aux âges où nous avons fait les mesures, les rejetons hybrides Swanson ont un taux de croissance intermédiaire. Cependant, compte tenu des différences de masse corporelle, il se peut que les taux de croissance aient été plus élevés dans les groupes de rejetons plus domestiqués aux âges antérieurs à nos mesures ou alors (et) que ces rejetons aient éclos avec une masse corporelle significativement plus grande que les hybrides semi-sauvages Swanson.

Document Type: Research Article

Publication date: July 1, 2009

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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