Schultz Sebastian, Vallant Birgit, Kainz Martin J
WasserCluster Lunz, Biologische Station, Aquatic Lipid Research and Ecotoxicology, Dr. Carl Kupelwieser Promenade 5, A-3293 Lunz am See, Austria ; Universität Wien, Department of Limnology, Althanstraße 14, A-1090 Wien, Austria.
Aquaculture. 2012 Mar 29;338-341(100):105-110. doi: 10.1016/j.aquaculture.2012.01.006.
This study on aquaculture ponds investigated how diet sources affect methyl mercury (MeHg) bioaccumulation of the worldwide key diet fish, common carp (). We tested how MeHg concentrations of one and two year-old pond-raised carp changed with different food quality: a) zooplankton (natural pond diet), b) cereals enriched with vegetable oil (VO ponds), and c) compound feeds enriched with marine fish oils (FO ponds). It was hypothesized that carp preferentially feed on supplementary diets with the highest biochemical quality (FO diet over VO diets over zooplankton). Although MeHg concentrations were highest in zooplankton of FO ponds, MeHg concentrations of carp were clearly lower in FO ponds (17-32 ng g dry weight) compared to the reference (40-46 ng g dry weight) and VO ponds (55-86 ng g dry weight). Stable isotope mixing models (δC, δN) indicated selective feeding of carp on high quality FO diets that caused MeHg concentrations of carp to decrease with increasing dietary proportions of supplementary FO feeds. Results demonstrate that carp selectively feed on diets of highest biochemical quality and strongly suggest that high diet quality can reduce MeHg bioaccumulation in farm-raised carp.
这项关于水产养殖池塘的研究调查了食物来源如何影响全球主要食用鱼类——鲤鱼的甲基汞（MeHg）生物累积情况。我们测试了一岁和两岁池塘养殖鲤鱼的甲基汞浓度如何随不同食物质量而变化：a）浮游动物（池塘天然食物），b）富含植物油的谷物（VO池塘），以及c）富含海洋鱼油的复合饲料（FO池塘）。研究假设鲤鱼优先食用生化质量最高的补充饲料（FO饲料优于VO饲料优于浮游动物）。尽管FO池塘浮游动物中的甲基汞浓度最高，但与对照组（40 - 46纳克/克干重）和VO池塘（55 - 86纳克/克干重）相比，FO池塘中鲤鱼的甲基汞浓度明显更低（17 - 32纳克/克干重）。稳定同位素混合模型（δC、δN）表明鲤鱼选择性地食用高质量的FO饲料，这导致鲤鱼体内的甲基汞浓度随着补充FO饲料在饮食中所占比例的增加而降低。结果表明鲤鱼选择性地食用生化质量最高的饲料，并有力地表明高饮食质量可以减少养殖鲤鱼体内的甲基汞生物累积。
