The research was conducted for 56 days from June to August 2016. The aim of this research was to know of river carp (Leptobarbus hoevenii) fingerling on water hyacinth fermentations. This study uses a completely randomized design (CRD) with one factor, five level treatments and three replications. The fish used in this research with size 5-7 cm in 7,2 – 8,6 g in weight. Fish were reared in 1 …