Huang Zhong-Li, Yang Zhan-Biao, Xu Xiao-Xun, Lei Yong-Jia, He Jin-Song, Yang Song, Wong Ming Hung, Man Yu-Bon, Cheng Zhang
College of Environment, Sichuan Agricultural University, Chengdu, China.
College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China.
Sci Total Environ. 2022 Dec 15;852:158164. doi: 10.1016/j.scitotenv.2022.158164. Epub 2022 Aug 31.
The bioaccumulation of total mercury (THg) and methylmercury (MeHg) by housefly maggots (HM) during the conversion of food waste (vegetables and meat (VM) and rice waste) under various waste feed ratios were investigated. Subsequently, Nile tilapia (Oreochromis niloticus) were fed with the commercial feed, commercial dried HM, dried HM, and fresh HM, followed by a human health risk assessment of Hg via fish consumption. The THg concentrations of HM fed with food waste ranged from 39.5 to 100 μg kg ww. Concentrations of MeHg in the maggots fed with 100 % vegetables and meat (VM) waste (13.7 ± 1.12 μg kg ww) was significantly higher than that fed with other mixed ratios of rice waste and VM waste (p<0.05). Concentrations of MeHg were positively correlated with the weight and lipid content of houseflies (p<0.05). THg and MeHg concentrations in tilapia fed with the converted HM (dried and fresh HM) were 22.5 ± 6.50 μg kg ww and 2.43 ± 0.36 μg kg ww, respectively. There was no significant difference in MeHg between tilapia fed the four experiment diets (p>0.05). Health risk assessment results indicated that mercury in tilapia fed the food waste-grown HM did not pose potential health risks to humans (target hazard quotient < 1). In conclusion, HM could convert food waste into high-quality and safe fish feeds for cultivating tilapia.
研究了家蝇幼虫（HM）在不同食物垃圾投喂比例下对食物垃圾（蔬菜和肉类（VM）以及米糠）进行转化过程中总汞（THg）和甲基汞（MeHg）的生物累积情况。随后，给尼罗罗非鱼（Oreochromis niloticus）投喂商业饲料、商业干燥家蝇幼虫、干燥家蝇幼虫和新鲜家蝇幼虫，接着通过食用鱼类对汞进行人体健康风险评估。用食物垃圾喂养的家蝇幼虫中THg浓度范围为39.5至100μg kg湿重。用100%蔬菜和肉类（VM）垃圾喂养的蛆中MeHg浓度（13.7±1.12μg kg湿重）显著高于用其他米糠与VM垃圾混合比例喂养的蛆（p<0.05）。MeHg浓度与家蝇的体重和脂质含量呈正相关（p<0.05）。用转化后的家蝇幼虫（干燥和新鲜家蝇幼虫）喂养的罗非鱼中THg和MeHg浓度分别为22.5±6.50μg kg湿重和2.43±0.36μg kg湿重。投喂四种实验饲料的罗非鱼中MeHg没有显著差异（p>0.05）。健康风险评估结果表明，食用以食物垃圾饲养的家蝇幼虫的罗非鱼中的汞不会对人类构成潜在健康风险（目标危害商数<1）。总之，家蝇幼虫可以将食物垃圾转化为用于养殖罗非鱼的高质量安全鱼饲料。
