School of Resources Environmental and Chemical Engineering, The Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education, Nanchang University, Nanchang, 330031, People's Republic of China.
Bull Environ Contam Toxicol. 2020 Dec;105(6):860-867. doi: 10.1007/s00128-020-03042-1. Epub 2020 Nov 17.
The carbon and nitrogen stable isotope compositions of the sediment organic matter, fish feed and fish feces were measured to assess the impact of the aquaculture waste from the cage fish farm in Poyang Lake. The results provide evidence of the non-negligible effect of aquaculture waste on the sediment organic matter. The δC and δN of sediments varied from - 27.62 to - 25.66‰ and 4.83 to 6.92‰, respectively. The sediment organic matter had a mixed source of waste feed, fish feces and plankton. The average contribution ratio of waste feed and fish feces was 53.1% and 24.6%, respectively. The aquaculture derived organic matter ratio was high with ranging from 57.6 to 95.6%. The aquaculture waste seemed to disperse widely enough to influence the study site about 2.5 km distance from the cage. The dispersion and resuspension were the main two factors which can explain the great effect area found in this study.
测定了沉积物有机质、鱼饲料和鱼粪的碳氮稳定同位素组成，以评估鄱阳湖网箱养鱼场养殖废物对底质有机质的影响。结果表明，养殖废物对底质有机质有不可忽视的影响。沉积物的 δC 和 δN 值分别在-27.62 至-25.66‰和 4.83 至 6.92‰之间变化。沉积物有机质的来源为饲料废物、鱼粪和浮游生物的混合。废物饲料和鱼粪的平均贡献率分别为 53.1%和 24.6%。养殖来源的有机物质比例很高，范围在 57.6%至 95.6%之间。养殖废物似乎有足够的扩散能力，影响到距离网箱 2.5 公里的研究地点。扩散和再悬浮是本研究中发现的大影响区域的两个主要因素。
