Author(s): Bella Maulidya, Rosidah, Junianto and Walim Lili

Abstract: This study aims to obtain the concentration of the most effective sambiloto extract to treat the infected catfish juveniles of Aeromonas hydrophila, so as to produce the highest survival rate of catfish juvenile. The research method was conducted experimentally using Completely Randomized Design (RAL) consisting of five treatments and three replications. The used treatment was soaking Siamese catfish juvenilefor 24 hours in the sambiloto extract at concentrations of A (0 ppm), B (50 ppm), C (75 ppm), D (100 ppm), E (125 ppm). Test fish infected by A.hydrophila bacteria as much as 2 ml of NaCl / L air at concentration 10⁸ CFU / mL with cohabitation method. The parameters observed were clinical symptoms, recovery process, survival rate and water quality. The results showed that the sambiloto extract was effective to treat Siamese catfish juvenile that were infected by A. Hydrophila, 75 ppm concentration produced the fastest recovery process that started from day 7 and the highest survival rate of 86.67%. Based on regression analysis of sambiloto extract giving effect to 91, 82% and optimum concentration to treat Siamese catfish juvenile infected by A. hydrophila bacteria is 84, 74 ppm.

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