Is Procambarus clarkii clean?

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I like fishing,but there are fewer and fewer fish in the river because lazy people here use electricity to catch them. So I want to fish Procambarus clarkii. But I am worried that this kind of creature is very dirty. Some say they were brought to China by Japanese in the 1930s to deal with dead bodies!


Look at this. Someone good at fishing  Procambarus clarkii.
http://v.youku.com/v_show/id_XNDIxNzQ2MzE2.html