Abstract: In order to study the effects of different water spinach (Ipomoea aquatica) floating bed coverage ratios in aquaponic systems on the feeding rate and growth performance of Nile tilapia (Oreochromis niloticus), four experimental groups were designed: a control group with 0% coverage (C0), and three aquaponic groups with 20% (C2), 30% (C3), and 40% (C4) coverage ratios. Each group contained three replicates. Feeding rates were calculated every 7 days. After 35 days of rearing, growth indices and serum antioxidant parameters were measured. Results showed no significant differences in feeding rates among groups during the 7th days and 14th days (P>0.05). On the 21st days, aquaponic groups exhibited significantly higher feeding rates than the control (P<0.05). On the 28th and 35th days, feeding rates followed the order C4 > C3 > C2 > C0 (P<0.05). At the end of the experiment, all performance indicators in the aquaponic groups surpassed those of the control group,and with the increase of the floating bed coverage rate, the weight gain rate and specific weight gain rate of tilapia in each group increased, the activities of serum antioxidant enzymes (CAT, GSH-PX) enhanced, the total antioxidant capacity (T-AOC) increased, and the content of malondialdehyde (MDA) decreased. Considering the feeding rate and growth performance indicators of tilapia in each group, it can be concluded that the aquaponic group with a 40% floating bed coverage rate had the best rearing effect within the experimental range.

Key words: aquaponics, floating bed coverage, nile tilapia, feeding rate, growth performance

摘要： 为探究鱼菜共生系统中不同水蕹菜（Ipomoea aquatica）浮床覆盖率对罗非鱼(Oreochromis niloticus)摄食率、生长性能的影响，设计对照组，水蕹菜覆盖率为0%（C0），鱼菜共生组，水蕹菜覆盖率分别为20%（C2）、30%（C3）和40%（C4），每组3个重复，每7 d作为1个摄食率周期，计算罗非鱼摄食率，饲养35 d后，计算各组罗非鱼的生长指标和测定血清抗氧化能力。结果显示：第7天、第14天，各组摄食率差异不显著（P>0.05）；第21天，鱼菜共生组的摄食率显著高于对照组（P<0.05）；第28天、第35天，各组摄食率表现为C4组>C3组>C2组>C0组（P<0.05）。试验结束时,鱼菜共生组的各项指标均优于对照组，且随着浮床覆盖率上升，各组罗非鱼体重增长率、体重特定增长率增大，血清抗氧化酶（CAT、GSH-PX）活力增强，总抗氧化能力（T-AOC）增大，丙二醛（MDA）含量降低。综合各组罗非鱼摄食率及生长性能指标，可以认为试验范围内，40%浮床覆盖率组养殖效果最佳。

关键词: 鱼菜共生, 浮床覆盖率, 罗非鱼, 摄食率, 生长性能