Author： Maazouzi Chafik
Publisher： Springer Publishing Company
ISSN： 1386-2588
Source： Aquatic Ecology, Vol.45, Iss.1, 2011-03, pp. : 23-33
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Abstract
Changes in dietary composition and its effects on the fatty acid (FA) composition of young-of-the-year (YOY) pumpkinseed (Lepomis gibbosus</i>) 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</i> (TL ≤ 35 mm) consisted mainly of zooplanktonic microcrustaceans and Chironomidae. Ontogenetic development influenced the FA composition of L. gibbosus</i>. Older YOY L. gibbosus</i> 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</i> would not transfer the benefits of consuming ω3 PUFA up the food web.
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