This study was conducted to investigate the effect of propolis on the growth, body composition, and serum biochemistry of juvenile sea bream (Sparus aurata). Propolis was added to a commercial sea bream feed (45.51% protein, 17.12 lipid %) at (control) 0 (P0), 1.25 (P1.25), 2.5 (P2.5), 5 (P5), 10 (P10), and 20 (P20) g kg⁻¹. The trial used three replicates of 50 fish (ca 12 g initial weight) in 400-L polyester tanks for each feed treatment, with feeding being done twice daily (09:00 and 17:00) by hand to satiation for 10 weeks. Specific growth rate (SGR) and weight gain (WG) varied quadratically with propolis concentration, with maxima at 3.68 g kg⁻¹. Feed conversion ratio (FCR) and protein efficiency ratio (PER) were not affected by feed treatments (P > 0.05). When body composition was examined at the end of the trial, there were no significant differences between treatment groups in percentage dry matter and lipid, but the highest protein was recorded for group P10 (P < 0.05). Propolis supplementation to the diets showed no effects on glucose (GLU), alkaline phosphatase (ALP), alanine aminotransferase (ALT), and aspartate aminotransferase (AST) in the serum. When the serum biochemical parameters such as total protein (TP), triglyceride (TRIG), and cholesterol (CHOL) were examined, the lowest values were found in the P20 group, while no significant difference was found with the other groups (P > 0.05). The study findings indicated that propolis does not decrease growth rates except at high levels.

进行这项研究以调查蜂胶对少年鲷（Sparus aurata）的生长，身体成分和血清生化的影响。将蜂胶以（对照）0（P0），1.25（P1.25），2.5（P2.5），5（P5），10（P10）添加到商品鲷鱼饲料中（45.51％蛋白质，17.12脂质％）和20（P20）g kg ^-1。该试验在400-L聚酯罐中使用了三份重复的50条鱼（初始重量为12 g）进行每次饲料处理，每天人工喂养两次（09:00和17:00），直到饱食10周。比生长速率（SGR）和增重（WG）随蜂胶浓度呈二次变化，最大值为3.68 g kg ^-1。饲料转化率（FCR）和蛋白质效率比（PER）不受饲料处理的影响（P＞ 0.05）。在试验结束时检查身体成分时，治疗组之间干物质和脂质的百分比没有显着差异，但记录到的最高蛋白质是P10组（P <0.05）。日粮中添加蜂胶对血清中的葡萄糖（GLU），碱性磷酸酶（ALP），丙氨酸氨基转移酶（ALT）和天冬氨酸氨基转移酶（AST）没有影响。当检查血清总生化（TP），甘油三酸酯（TRIG）和胆固醇（CHOL）等生化参数时，P20组的最低值，而其他组则无显着性差异（P> 0.05）。研究结果表明，蜂胶除高水平外不会降低生长速率。