Nile tilapia, Oreochromis niloticus (4.12 ± 0.05 g initial weight), and red seaweed, Gracilaria tenuistipitata, were co-cultured in 250-L tanks for 8 weeks. Six feeding treatments were conducted, with the control group (monoculture) being fed a commercial pellet (30% protein, 6% lipid) at 100% feed ration (4% of biomass per day), while fish in the five other groups were co-cultured with red seaweed (1 kg m⁻³) and received pellet at 80%, 60%, 40%, 20%, and 0% of the feeding ration of the control. The results indicated that the concentrations of TAN, NO₂⁻, NO₃⁻, and PO₄³⁻ in the co-culture tanks were much lower than those in the monoculture. Moreover, the growth rate and productivity of fish in the 80% feeding ration treatment were comparable to those in the control group (p > 0.05). However, fish performance gradually reduced with a decrease in feeding rates from 60% downwards and all were significantly inferior to the control group (p < 0.05). Feed conversion ratio and feed cost were lower at the lower feeding rates. The results also proved that the co-culture of tilapia–red seaweed supplied at 80% feed ration, which could reduce feed cost by 28.9% compared with the control, still sustained normal growth while also maintaining better water quality. The proximate composition of fish fillet (moisture, protein, lipid, and ash) is also discussed.

尼罗罗非鱼，尼罗罗非鱼（4.12±0.05 g初始重量）和红藻海藻（Gracilaria tenuistipitata）在250 L的水箱中共培养8周。进行了六次饲喂处理，对照组（单一养殖）以100％的饲喂比（每天4％的生物量）饲喂商业颗粒（30％的蛋白质，6％的脂质），而其他五个组的鱼则被饲喂。 -用红海藻（1 kg m ^-3）培养，并以对照的摄食量的80％，60％，40％，20％和0％接收颗粒。结果表明，TAN，NO的浓度₂ ^-，NO ₃ ^-和PO ₄ ^3-共培养槽中的水平均比单培养中的低。此外，在80％摄食率处理下，鱼的生长速度和生产率与对照组相当（p  > 0.05）。然而，随着摄食率从60％下降，鱼的生长性能逐渐下降，并且均明显低于对照组（p  <0.05）。在较低的进料速率下，饲料转化率和饲料成本较低。结果还证明，以罗非鱼-红海藻的混养比例为80％的饲料配比，与对照组相比可以降低饲料成本28.9％，在保持正常水质的同时，还能保持更好的水质。还讨论了鱼片的近邻成分（水分，蛋白质，脂质和灰分）。