Abstract:
One of Tilapia culture problem development is water quality. The effort to solve the problem
is apply leaching method that the replacement of water with new water by utilizing the
mechanism of the tides. The aim of this research was to determinethe effect ofleaching
methodwithdifferent frequencyon water quality, survivalandgrowthof tilapia. This research
was held sinceJanuary until April2015in Muliasari village, Banyuasin Regency, South
Sumatera.The research method usedT-testwith4 treatmentsand3replications is P0 without
leaching, P1 with ones leaching, P2 with twice leaching and P3 with third leaching. The
result showed that the highest treatments was P2 with the value of water quality is
temperature 26-30oC, salinity 0 mg.L-1,brightness 15-75 cm, dissolved iron 0.06-0.15 mg.L-1,
sulfat 8.75-160.6 mg.L-1, dissolved oxygen 3.64-5.92 mg.L-1, pH 3.0-5.8, mg.L-1 and ammonia
0.4-0.22 mg.L-1. The best survival rate was 81.67 % and the highest growth with the weight
was 9.95 g and length was 4.29cm. Based on the results, treatment with twice leaching can be
applied to maintenance water quality and increace thilapia growth and survival rate in tidal
lowland.
