PENGARUH FERMENTASI UBI JALAR UNGU (Ipomoea batatas) SEBAGAI MEDIA PERTUMBUHAN CACING SUTRA (Tubifex sp)

This study aims to determine the effect of the use of purple sweet potato fermentation media on the growth of Silk worms and to find out the right dose of purple sweet potato fermentation to produce optimal Silk worm growth. This research was conducted at the Laboratory of Aquaculture at the Faculty of Agriculture, Universiatas Asahan, with a maintenance period of 30 days. This study uses a completely randomized design (CRD) with 5 treatments and 5 repetitions. The treatments in this study included A (100% mud), B (75% mud and 25% fermented purple yam), C (50% mud and 50% purple yam fermentation, D (25% mud and 75% purple yam fermentation), and E. (100% purple fermentation) The main parameters observed were the addition of Silk worms, while the supporting parameters were temperature, DO, water pH, and ammonia.The data obtained were statistically tested using analysis of variance (ANOVA). From the results of data analysis conducted showed that the use of fermented cassava medium and Gurami Mud Fish gave no real effect (p> 0.05) on the growth of Silk worms. The best results were found in treatment D, namely formulation of 75% mud and 25% fermented purple yam and Gurami Fish Mud which produced Growth of 5.34 grams and a population of 1068 individuals. Water quality during maintenance, namely temperatures ranging from 25,0 to 27,1°C , pH ranged from 5,01 to 6,98 , DO ranged from  2,13 to 3,02 ppm and ammonia ranged from 0,25 to 1,5 ppm. Keywords : Tubifex sp, fermentation, purple sweet potato and mud