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In the rumen, there are many cellulolytic bacteria that help the digestive process of Ruminantia. Cellulolytic bacteria are bacteria that have the ability to break down cellulose into glucose monomers and make it a source of carbon and energy source. This bacterium has the potential to be used as probiotics in fish feed. The purpose of this study was to determine the effect of rumen cellulolytic bacteria in feed on growth performance of tilapia, this study used a Completely Randomized Design (RAL) with 4 treatments and 3 replications at doses of 0%, 1%, 1.5%, and 2%. Tilapia fish 6-8 cm in size, as many as 50 fish in the pond were treated and observed for 1 month. The results showed that the administration of cellulolytic bacteria in feed could improve the growth performance of tilapia. Improvement can be seen in terms of absolute good weight of fish, specific growth rate (SGR), JKP (amount of feed consumption), EP (feed efficiency) and SR (life pass) which are also optimal for the growth performance of the tilapia at P2 treatment (dose 1.5%) and P3 (2% dose), it was concluded that the higher dose of cellulolytic bacteria can affect the growth performance of tilapia.