This study aims to determine the content of organic carbon total nitrogen TN the total number of bacteria TB and the level of decomposition of organic matter in the bottom substrate of shrimp vannamei ponds Litopenaeus vannamei in Sanggalangit Village Gerokgak District Buleleng Bali Organic matter that is constantly accumulating on the pond bottom substrate can reduce the quality of the water Data was collected in FebruaryMay 2019 using purposive samp

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