不同光周期下欧洲舌齿鲈幼鱼生长、摄食和肌肉营养成分的比较

选取450尾欧洲舌齿鲈（）幼鱼,体长（13.50±0.52）cm,体重（46.04±0.61）g,监测其在5种光周期（0L：24D、8L：16D、12L：12D、16L：8D、24L：0D,L表示光照时间,D表示黑暗时间）下的生长、摄食及肌肉营养成分等相关指标。实验周期为60 d。结果表明,8L：16D处理组的欧洲舌齿鲈的日增重系数显著高于其他各组（<0.05）;0L：24D和8L：16D处理组粗脂肪含量分别较16L：8D处理组分别提高了19.70%和21.67%（<0.05）。5种光周期下的欧洲舌齿鲈幼鱼肌肉中均检测到17种氨基酸,其中8L：16D和12L：12D处理组的肌肉中氨基酸总含量较0L：24D组分别提高11.60%和9.16%（>0.05）;肌肉中二十碳五烯酸（EPA）与二十二碳六烯酸（DHA）总含量在8L：16D处理组中最高,为14.21%,在0L：24D处理组中最低,为12.30%。不同光照周期对欧洲舌齿鲈幼鱼生长、摄食和肌肉营养品质均产生了不同程度的影响,综上所述,8L：16D和12L：12D光照环境更适宜欧洲舌齿鲈的生长。

Comparative study of the growth, feeding, amino acid composition, and nutritional quality of Dicentrarchus labrax juveniles under different light photoperiods

This study aimed to investigate the effects of different photoperiods on the growth, feeding, and muscle nutrient quality of =450, body length:(13.50±0.52) cm, body weight:(46.04±0.61 g)] were evenly distributed into five different photoperiods (0L:24D, 8L:16D, 12L:12D, 16L:8D, and 24L:0D, "L" and "D" imply light dark and the numbers refer to the number of hour.) and cultured for 60 d. The daily growth index of in the 8L:16D group was significantly higher than the other groups (<0.05). The feed conversion efficiency of the 8L:16D group was higher than the 0L:24D and 24L:0D groups, which increased by 58.28% and 121.98%, respectively (<0.05). The crude lipid contents of the 8L:16D and 0L:24D groups were lower than the 16L:8D group, decreasing by 19.70% and 21.67%, respectively (<0.05). Compared to the 0L:24D and 24L:0D groups, the collagen content of the 8L:16D group increased by 82.04% and 92.98%, respectively (<0.05). Seventeen amino acids were detected in all of the groups, and the total amino acid contents in the muscle of the 8L:16D and 12L:12D groups were higher than the 0L:24D group, which increased by 11.60% and 9.16%, respectively (>0.05). Total content of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) was highest in the 8L:16D group (14.21%) and lowest in the 0L:24D group (12.30%). The photoperiods differentially affected the growth, feeding, and nutritional quality of the juveniles and the results suggest that the 8L:16D and 12L:12D photoperiods are most suitable.