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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的影响,即水环境特点、鱼类的生态习性、虫的落结运输等。

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Digenetic trematodes infection on fish was analyzed in the Bohai Sea horn 1983 to 1986.The results showed that the infection value in inner sea was higher than outer sea.

摘要1983~1986年采集于渤海的鱼类感染虫进行分析,结果表明:从外海到内海鱼类感染强度呈现加重的趋势。

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