Raw Propolis Promotes Growth of Sea Bass

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Effects of Propolis Enriched Diet on Growth Performance and PlasmaBiochemical Parameters of Juvenile European Sea Bass (Dicentrarchus labrax L.) UnderAcute Low-Temperature Stress
Aquaculture Nutrition, Early View (Online Version of Recordpublished before inclusion in an issue)To study the effect of propolis in crude form (CPP),prepared without any chemical refinement (CPP) on Dicentrarchus labrax underlow-temperature stress, sea bass juveniles were randomly divided into threegroups: a control group fed with basal diet and two treatment groups fed withbasal diet supplemented with 1.25 and 2.5 g kg−1 of propolis. At the end of a 10-week feeding trial, sea bass were exposedto low-temperature stress at 12 °C for 24 h. The growth performance, RNA/DNAratio and changes in serum biochemical parameters were investigated. Dietaryintake of propolis stimulated the specific growth rate (SGR), feed conversionefficiency (FCE), RNA/DNA ratio and alkaline phosphatase (ALP) enzyme activity,while decreasing plasma triglycerides and aspartate aminotransferase (AST)activity. Supplement of 2.5 g kg−1 CPP in diet significantly increased the meanSGR and FCE up to 9% and 13.4%, respectively, in comparison with the controlgroup. Low-temperature stress elevated serum triglycerides, glucose and cortisollevels in all groups; however, glucose and cortisol reached significantly lowerend values in group receiving highest amount of propolis in diet. This study suggests that ingestion of basal dietsupplemented with 2.5 g kg−1 of propolis could prevent adverse effects oflow-temperature stress and promote the growth of sea bass.