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Optimizing diets to decrease environmental impact of Nile tilapia ( Oreochromis niloticus ) production
Aquaculture Nutrition ( IF 3.5 ) Pub Date : 2019-10-25 , DOI: 10.1111/anu.13004
Rita Teodósio 1, 2 , Sofia Engrola 1 , Rita Colen 1 , Karthik Masagounder 3 , Cláudia Aragão 1, 2
Affiliation  

Aquaculture is one of the most thriving animal production sectors, and Nile tilapia (Oreochromis niloticus) farming represents 8% of total finfish culture. However, the industry sustainability depends on the development of cost‐effective and environmental friendly feeds. This study aimed to reduce dietary protein levels in diets for juvenile tilapia and to minimize diet environmental impact while maximizing biological efficiency. A growth trial was performed using five isoenergetic plant protein‐based diets with decreasing levels of crude protein: 360, 340, 320, 300 and 280 g/kg diet (D360, D340, D320, D300 and D280, respectively). Dietary protein utilization was assessed by metabolic trials using a radiolabelled amino acid mixture. Tilapia in all treatments showed similar growth performance and feed intake. Feed conversion ratio was significantly higher in fish fed the D280 than the D360 diet, while no differences were found for other treatments. Protein retention was significantly higher in tilapia fed the D300 than the D360 diet. Amino acid catabolism increased in fish fed the D360 diet, though without significant differences in muscle amino acid retention. This study demonstrates that dietary protein levels can be reduced to 300 g/kg diet without hindering tilapia growth and feed conversion ratio, while reducing environmental nitrogen losses.

中文翻译:

优化饮食以减少尼罗罗非鱼(Oreochromis niloticus)生产对环境的影响

水产养殖是最繁荣的动物生产部门之一,尼罗罗非鱼(Oreochromis niloticus)养殖占有鳍鱼类养殖总量的 8%。然而,行业的可持续性取决于开发具有成本效益和环境友好的饲料。本研究旨在降低罗非鱼幼鱼日粮中的日粮蛋白质水平,并最大限度地减少日粮环境影响,同时最大限度地提高生物效率。使用五种等能植物蛋白日粮进行生长试验,粗蛋白水平降低:360、340、320、300 和 280 g/kg 日粮(分别为 D360、D340、D320、D300 和 D280)。通过使用放射性标记氨基酸混合物的代谢试验评估膳食蛋白质的利用。所有处理中的罗非鱼显示出相似的生长性能和采食量。饲喂 D280 的鱼的饲料转化率显着高于 D360 的饲料,而其他处理没有发现差异。喂食 D300 的罗非鱼的蛋白质保留率显着高于喂食 D360 的罗非鱼。喂食 D360 饮食的鱼的氨基酸分解代谢增加,但肌肉氨基酸保留没有显着差异。该研究表明,日粮蛋白质水平可以降低到 300 g/kg 日粮,而不会阻碍罗非鱼的生长和饲料转化率,同时减少环境氮损失。虽然在肌肉氨基酸保留方面没有显着差异。该研究表明,日粮蛋白质水平可以降低到 300 g/kg 日粮,而不会阻碍罗非鱼的生长和饲料转化率,同时减少环境氮损失。虽然在肌肉氨基酸保留方面没有显着差异。该研究表明,日粮蛋白质水平可以降低到 300 g/kg 日粮,而不会阻碍罗非鱼的生长和饲料转化率,同时减少环境氮损失。
更新日期:2019-10-25
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