The change trend was influenced by several reasons such as the aquatic habitat, the ecological characteristics of fish, the community structure of digenetic trematodes and import of live fish.
这种变化趋势受多种因素
影响，即水环境特点、鱼类
习性、复殖吸虫群落结构、活物
输等。
The change trend was influenced by several reasons such as the aquatic habitat, the ecological characteristics of fish, the community structure of digenetic trematodes and import of live fish.
这种变化趋势受多种因素影响，即水环境特点、鱼类习性、复殖吸虫群落结构、活物输等。
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