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Impact of macroinvertebrate diet on growth and fatty acid profiles of restocked 0+ Atlantic salmon (Salmo salar) parr from a large European river (the Allier)

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Abstract:

The influence of macroinvertebrate diet on growth and fatty acid profiles of Atlantic salmon (Salmo salar) parr released at the fry stage in three different riffles was studied in a large temperate river (Allier, France). Comparisons were made between sites and between restocked parr and hatchery-reared counterparts fed with a traditional fish diet. Significant differences were observed along the longitudinal gradient of the river and between restocked and hatchery-reared parr. Growth performance and nutritional status were higher in the hatchery and in downstream riffles and low in the most upstream site. These differences appeared to be related to different types of diet and consequently to variations in polar and neutral lipid intakes. The most favorable site for optimum growth appeared to be the intermediary riffle, with values close to those achieved in the hatchery. Simuliids and baetids, preferentially consumed in downstream sites, constitute an interesting type of food, showing quite different fatty acid composition from vegetable oils. This could be of interest for composing a new diet formula for young salmon intended for river restocking, imitating these macroinvertebrate fatty acid profiles.

L’influence de la consommation de proies naturelles sur la croissance et les profils d’acides gras de tacons de saumon atlantique (Salmo salar) déversés dans différents radiers a été étudiée sur un grand cours d’eau européen: l’Allier, France. Des comparaisons ont été effectuées entre trois sites de déversement étagés de l’amont vers l’aval, ainsi qu’entre les tacons relâchés et leurs homologues maintenus en salmoniculture et nourris d’aliments artificiels formulés à partir de farines de poissons. Les meilleures performances de croissance et de statut nutritionnel ont été observés en salmoniculture ainsi que dans les radiers aval, tandis que les plus faibles ont été enregistrées sur le radier situé le plus en amont. Ces observations semblent être liées aux différences de régime alimentaire, et par conséquent, à des teneurs variables en lipides neutres et polaires. Le radier le plus favorable à la croissance des tacons semble être le site intermédiaire qui présente des performances proches de celles observées en salmoniculture. En outre, les simulidés et les baetidés, proies préférentiellement consommées dans les sites aval, semblent constituer une nourriture intéressante pour les juvéniles en raison de leurs profils particuliers d’acides gras. Ces diptères pourraient ainsi permettre de formuler de nouveaux aliments artificiels destinés aux tacons de repeuplement.

Document Type: Research Article

Publication date: 2010-04-01

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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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