Abstract
Parasites Trichodina sp. is one type of fish disease that infects most tilapia. This parasite can penetrate the gill lamella and penetrate the blood vessels, causing bleeding. These injuries can cause the death of fish. This research aims to determine the effect of using Piper betle leaf extract concentration in the commercial feed on the intensity of parasites that attack tilapia (Oreochromis niloticus). The method used for data collection in this study is experimental, and laboratories with average weight are 15-20 gram of tilapia test organisms. The parameters observed included the intensity of the parasite Trichodina sp. and water quality. The results showed that the concentration of Piper betle leaf extract in treatment D (20% Piper betle leaf extract / 1 kg feed) gave the best treatment, where the intensity of Trichodina sp. which infected tilapia 16,17 ± 7,76. Data supporting measurement of water quality parameters including temperature, pH, DO, and ammonia in each treatment during the study are still within the proper limits for the life of tilapia.
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