This research has been implemented for 56 days from July to October 2018. This research intend to determine the growth rate of Tilapia seeds (Oreochromis Niloticus) on feed containing fermented hyacinth leaves using cow rumen fluid, and to determine the best percentage of fermented hyacinth flour in feed for the growth Tilapia seeds (Oreochromis Niloticus). This research use a Completely Random…