Effects of stocking density and dietary phosphorus levels on the growth performance, antioxidant capacity, and nitrogen and phosphorus emissions of juvenile blunt snout bream (Megalobrama amblycephala)
文献类型： 外文期刊
作者： Yu, Heng 1 ; Yang, Qiang 2 ; Liang, Hualiang 3 ; Ren, Mingchun 1 ; Ge, Xianping 1 ; Ji, Ke 1 ;
作者机构： 1.Nanjing Agr Univ, Wuxi Fisheries Coll, Wuxi 214081, Jiangsu, Peoples R China
2.Jiangsu Tianshen Co Ltd, Huaian, Peoples R China
3.Chinese Acad Fishery Sci CAFS, Key Lab Genet Breeding Aquat Anim & Aquaculture B, Freshwater Fisheries Res Ctr FFRC, Wuxi, Jiangsu, Peoples R China
关键词： antioxidant capacity; blunt snout bream (Megalobrama amblycephala); growth; nitrogen and phosphorus emissions; phosphorus; stocking density
期刊名称：AQUACULTURE NUTRITION （ 影响因子：3.497； 五年影响因子：3.78 ）
ISSN： 1353-5773
年卷期： 2021 年 27 卷 2 期
页码：
收录情况： SCI
摘要： A 10-week experiment was carried out to investigate the effects of stocking density and dietary phosphorus levels of blunt snout bream. Two culture density treatment groups (20, 60/m(3)) were set up, and each experimental group was fed three gradient (8.1 g/kg, 11.5 g/kg and 14.3 g/kg) phosphorus levels. The results showed that high stocking density suppressed growth performance and feed utilization in juvenile blunt snout bream. The weight gain rate, specific growth rate and protein efficiency ratio increased significantly with increasing phosphorus levels, but the feed conversion ratio exhibited the opposite trend. The moisture and ash components both achieved the maximum value while crude lipid content reached the lowest value with 14.3 g/kg phosphorus. Superoxide dismutase activity was decreased significantly with increasing dietary phosphorus levels. The expression levels of the nuclear factor erythroid 2-related factor 2, copper zinc superoxide dismutase and Kelch-like ECH-associated protein 1 were dramatically affected by dietary phosphorus levels. Glutathione peroxidase 1 mRNA level was only interfered by stocking density. In addition, high dietary phosphorus and stocking density increased the total phosphorus and ammonia nitrogen emissions in water. Generally, suitable stocking density and dietary phosphorus levels have economic and environmental benefits in the production of blunt snout bream.
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