Effectiveness of Reverse Osmosis (RO) Water on the Growth of Denison Fry (Puntius denisoni Day, 1865)

This research aims to determine the optimal addition of reverse osmosis water for the growth and survival rate of Denison fish fry. The preliminary test was carried out on 16-22 May 2022 and the main research was carried out on 4-31 July 2022 at Pt. Waris, Breedlife Fish Farm, and Central Jakarta. The research method was carried out experimentally using a completely randomized design (CRD) method consisting of five treatments with three replications, namely the treatment of 100% groundwater maintenance media, the addition of 25%, 50%, 75% reverse osmosis water and the use of 100% reverse osmosis water. . The fish used are Denison fish seeds with a size of 2-3 cm. Fish were treated for 28 days. The feed given is Tubifex sp worms. and given daily ad satiation. Parameters observed were water quality in the form of temperature, total dissolved solids (TDS), degree of acidity (pH) measured every day, and ammonia measured every week. The main parameters of this research are the specific growth rate (SGR) and survival rate (SR). Based on the research results, it was concluded that the addition of reverse osmosis water in the range of 25-50% resulted in the survival performance of Denison fry with a rate of 98% and a specific growth rate in the range of 3.14-3.39%.