Changes of main environmental factors of composite culture system in Xinglin shrimp pond

On the basis of an investigation on water quality(water temperature,diaphaneity,specific gravity,NH 4 N,NO 2 N,NO 3 N,DIP,pH and COD etc.) and sediment (organic matters,sulphide)of composite culture system in Xinglin shrimp pond from October 1999 to July 2000,the results showed that these indications of water quality and sediment were stabler.They were accorded with demands of aquaculture.The real benefit also showed that composite culture benefit of the shrimp pond was more remarkable.