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Spawning behaviour and success of mature male Atlantic salmon (Salmo salar) parr of farmed and wild origin

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We examined genetic differences in the reproduction of an alternative maturation phenotype in Atlantic salmon (Salmo salar) by comparing the spawning behaviour and success among farmed, first-generation hybrid, and wild mature male parr raised in similar environments. Parr competed for spawning opportunities in the presence of either wild or farmed large males. There were no consistent differences among groups in aggression; however, there were differences in spawning participation with respect to large male origin and among parr types. There was a strong negative temporal effect on mature male parr spawning participation that differed by parr type; wild and farmed parr were most likely to participate in early spawnings, with hybrids being the most likely to participate in late spawnings. Overall, parr were also less likely to participate in spawnings involving large farmed males. Variance in reproductive success was higher among parr than among large males. Our results are consistent with the hypothesis that there are genetically based behavioural differences among mature male parr of farmed and wild origin that may potentially lead to differences in reproductive success.

Nous avons examiné les différences génétiques lors de la reproduction d'un phénotype mature de rechange du saumon atlantique (Salmo salar) en comparant le comportement de fraye et le succès de la fraye chez des tacons mâles matures hybrides de première génération de pisciculture et des tacons mâles matures sauvages élevés dans des conditions similaires. Les tacons font compétition pour obtenir des occasions de frayer en présence de mâles de grande taille provenant soit du milieu naturel, soit de pisciculture. Il n'y a pas de différences soutenues dans l'agression entre les groupes; il y a cependant des différences dans la participation à la fraye, en fonction de l'origine des grands mâles et des types de tacons. Il y a un fort effet temporel négatif sur la participation des tacons mâles matures à la fraye qui varie en fonction du type de tacon; les tacons du milieu naturel et de pisciculture sont plus susceptibles de participer à des frayes hâtives, alors que les hybrides le sont pour les frayes tardives. En général, les tacons sont moins susceptibles de participer à des frayes qui impliquent de grands mâles de pisciculture. La variance dans le succès de la reproduction est plus élevée chez les tacons que chez les grands mâles. Nos résultats s'accordent avec l'hypothèse qui veut qu'il y ait des différences de comportement génétiquement déterminées chez les tacons matures provenant du milieu naturel et de pisciculture qui mènent potentiellement à des différences de succès reproductif.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: May 1, 2005

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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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