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Dispersion of Atlantic salmon (Salmo salar) fry from competing families as revealed by DNA profiling

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Abstract:

Minisatellite-based DNA profiling was used to investigate the dispersion of synchronously spawned families of Atlantic salmon (Salmo salar L.) fry from artificial nests in a natural stream. By the end of the summer, i.e., 17 weeks after hatching, detected dispersion was mainly downstream and less than 1 km. Within this distance, three families that had been stocked together showed different patterns of dispersion, with the relative abundance of each family changing systematically with distance downstream from the nest, but with no monopolization of any area or habitat type by any one family. The length of fry also changed systematically with distance downstream, with the patterns of change depending on family. For each family, fry were larger closer to the nest. Changes in habitat type had a common effect on the density and length of fry from all the families.

La détermination des profils d'ADN microsatellite a permis d'étudier la dispersion de familles d'alevins du Saumon de l'Atlantique (Salmo salar L.) provenant de fraies simultanées dans des nids artificiels d'un cours d'eau naturel. À la fin de l'été, i.e., 17 semaines après l'éclosion, la dispersion s'observait surtout vers l'aval sur une distance de moins de 1 km. Sur cette distance, les trois familles qui avaient été ensemencées ensemble avaient des patterns de dispersion différents et l'importance relative de chaque famille changeait de façon systématique avec la distance en aval du nid, sans qu'aucune des familles ne monopolisât une section ou un habitat particuliers. La longueur des alevins variait aussi systématiquement avec la distance vers l'aval, chaque famille selon un agencement particulier, les alevins de chaque famille étant plus gros près du nid. Les changements de type d'habitat avaient le même effet sur la densité et la longueur des alevins de toutes les familles.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2001

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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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