Chinese rice paddies are increasingly used to farm fish, ducks, crawfish and eels, among other things. This has been done since ancient times but is making a resurgence due to the benefits of not having to use artificial fertilizers and pesticides. The fish and ducks eat insects and also their waste fertilizes the paddies in a symbiotic relationship.
Rice-duck Farming
http://www.youtube.com/watch?v=SVL0Ku6iodM
Rice-fish farming
http://www.youtube.com/watch?v=ejP1VflTZ4A
article
http://www.chinadaily.com.cn/food/2012-02/22/content_15733045.htm
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