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

作者：Maazouzi Chafik^*; Medoc Vincent; Pihan Jean Claude; Masson Gerard

来源：Aquatic Ecology, 2011, 45(1): 23-33.

DOI：10.1007/s10452-010-9320-1

• Ontogenetic changes
• Reservoir
• Prey species
• Freshwater fish
• Food web

Changes in dietary composition and its effects on the fatty acid (FA) composition of young-of-the-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 a parts per thousand currency sign 35 mm) consisted mainly 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 omega 3/omega 6 ratio and low PUFA content (mainly on DHA) suggested that L. gibbosus would not transfer the benefits of consuming omega 3 PUFA up the food web.

• 出版日期2011-3