Size-related dietary changes observed in young-of-the-year pumpkinseed (Lepomis gibbosus): stomach contents and fatty acid analyses. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Aquatic Ecology Année : 2011

Size-related dietary changes observed in young-of-the-year pumpkinseed (Lepomis gibbosus): stomach contents and fatty acid analyses.

Résumé

Changes in dietary composition and its effects on the fatty acid (FA) composition of young-ofthe- year (YOY) pumpkinseed (Lepomis gibbosus) from an artificial reservoir (Mirgenbach--northeastern France) were related to body size as shown by stomach content and FA analyses. Comparisons were made between three size classes of fishes: 25-35 mm total length (TL), 35-45 mm TL and 45-55 mm TL. Diets of the youngest L. gibbosus (TL ≤ 35 mm)consistedmainly of zooplanktonic microcrustaceans and Chironomidae. Ontogenetic development influenced the FA composition of L. gibbosus. Older YOY L. gibbosus showed an increase in proportions of monounsaturated FA proportions and a decrease in polyunsaturated FA and mainly essential FA (particularly docosahexaenoic acid). The low ω3/ω6 ratio and low PUFA content (mainly on DHA) suggested that L. gibbosus would not transfer the benefits of consuming ω3 PUFA up the food web.

Dates et versions

hal-00580360 , version 1 (28-03-2011)

Identifiants

Citer

Chafik Maazouzi, Vincent Médoc, Jean-Claude Pihan, Gérard Masson. Size-related dietary changes observed in young-of-the-year pumpkinseed (Lepomis gibbosus): stomach contents and fatty acid analyses.. Aquatic Ecology, 2011, 45 (1), pp.23-33. ⟨10.1007/s10452-010-9320-1⟩. ⟨hal-00580360⟩
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