LANEH, School of Life Sciences, East China Normal University, Shanghai 200241, PR China.
LANEH, School of Life Sciences, East China Normal University, Shanghai 200241, PR China.
Food Chem. 2021 May 1;343:128479. doi: 10.1016/j.foodchem.2020.128479. Epub 2020 Oct 28.
Hypoxia and high-fat diet (HFD) feeding are two factors commonly existing in aquaculture. However, their individual and combined effects on nutrient composition and flesh quality in fish have not been investigated. The present study evaluated the alterations of growth, nutrient composition and flesh quality in Nile tilapia (initially 7.0 ± 0.1 g and 5.6 ± 0.2 cm) fed with normal fat diet (5.95% fat) or HFD (11.8% fat) at two dissolved oxygen levels (1.1 ± 0.1 and 7.2 ± 0.1 mg/L) for 8 weeks. The results showed that hypoxia and HFD had similar effects in inducing lipid deposition, reducing flesh protein and amino acids content, pH values and water holding ability. Hypoxia had additional adverse effects in decreasing meat yield, flesh contents of n-3 PUFA and glycogen, increasing flesh fragmentation and causing liver damages. The combination of hypoxia and HFD significantly decreased feed intake, survival rate and muscle protein content, but didn't affect flesh quality-related parameters.
缺氧和高脂肪饮食（HFD）是水产养殖中常见的两个因素。然而，它们对鱼类营养成分和肉质的单独和联合影响尚未得到研究。本研究评估了在两种溶解氧水平（1.1±0.1 和 7.2±0.1 mg/L）下，用正常脂肪饮食（5.95%脂肪）或 HFD（11.8%脂肪）喂养初始体重为 7.0±0.1 g 和初始体长为 5.6±0.2 cm 的尼罗罗非鱼 8 周后生长、营养成分和肉质的变化。结果表明，缺氧和 HFD 具有相似的诱导脂质沉积的作用，降低鱼肉蛋白质和氨基酸含量、pH 值和持水能力。缺氧还会降低肉产量、鱼肉 n-3PUFA 和糖原含量，增加鱼肉破碎度，并导致肝脏损伤。缺氧和 HFD 的联合作用显著降低了饲料摄入量、存活率和肌肉蛋白质含量，但对与肉质相关的参数没有影响。
