In order to realize healthy culture and improve waterbody yield and quality by the largest extent,this paper studied and developeded a closed cage to running water type.The closed cage has window(hole) on the wall,which can be opened for changing water.The holes could be closed or opened by waterproof zippers.The closed cage was installed on cement floating body,and 2 pumps were used to provide circulating water thus improving flesh quality while removing fecal matter and unconsumed feed.This closed cage co...