近年来，水体富营养化所带来的环境问题日益受到人们关注，其中丝状蓝藻增殖所产生的土霉异味严重影响水产品品质。鲢是我国"四大家鱼"之一，藻类是其主要的食物来源。研究并揭示藻源性土霉异味物质在鲢体内分布、累积及代谢，对于提高相关水产品品质有着十分积极的意义。本项目拟通过对爆发丝状蓝藻水华和土霉异味问题严重的精养鱼塘开展野外调查，研究水体土霉异味物质来源与时空分布特征以及鲢不同器官组织中异味物质的分布与累积；同时在受控系统中，运用同位素示踪技术，揭示异味物质进入鲢的主要途径，探讨异味物质在鲢体内的累积器官，根据不同器官中脂肪和蛋白质含量与土霉异味物质浓度的分布特征，揭示其累积的关键过程。通过GC-MS分析主要代谢产物，探讨外界条件改变对代谢的影响，解析其代谢动力学特征。并根据异味物质在鲢体内分布、累积及其代谢特征，建立水产品中土霉异味物质风险评价体系，为我国淡水水产养殖和渔业管理提供科学依据。

In recent years, environmental problems caused by eutrophication have been received increasingly attention. For example, the earthy-musty odor produced by filamentous cyanobacteria seriously affects the quality of aquatic products. Silver carp (Hypophthalmichthys molitrix) is one of the four major Chinese carps, and algae are its major source of food energy. In this study, we investigate the distribution, accumulation and metabolization of earthy-musty odor produced by algae in silver carp, which is very essential to enhance the quality of aquatic products. The field investigation will be started from fish pond with seriously filamentous cyanobacteria bloom and earthy-musty odor. The source, spatial and temporal distribution characteristics of earthy-musty odor as well as its distribution in different organs of silver carp will be investigated. In the control system, isotope tracer technique will be utilized to reveal the main way of the earth-muddy odor entering into silver carp. According to the concentrations of fat and protein in organs that earthy-musty odor accumulating in, the key process of accumulation behavior of earthy-musty odor will be proposed. We will use GC-MS to detect metabolization products, to evaluate the effect of change of surroundings on its metabolization process and further to reveal the characteristics of metabolic dynamics. Thus, the system of risk assessment will be established based on the characteristics of distribution, accumulation and metabolization of earthy-musty in silver crap. The results of this study will provide scientific basis for freshwater aquaculture and fisheries management.