Study on Sediment Quality Dynamic in Pacific White Shrimp ( Litopenaeus vannamei ) Pond aquaculture, at Faculty of Secience and Fishery Techology, Rajamangala University of Technology Srivijaya, Trang Campus. The result shown average pH of soil was 7.49 in both pond No.1 and 2. The average of organic matter in pond No.1 and 2 were 6.60% and 6.65%, respectively. An average organic matter among was not significant (P